NTI Tft250 Error Codes

Updated October 16, 2026 · by Aurora Star Tech Inc.

NTI Tft250 error codes and diagnostic codes (also listed as NTI Trinity Tft250). The Tft250 is a NTI boiler in the Trinity Tft series.

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NTI Tft250 error codes list

Code	Meaning	Severity
Alert 1	Alert PCB was restored from factory defaults	Low
Alert 1	Alert PCB was restored from factory defaults	Low
Alert 2	Safety configuration parameters were restored from factory defaults	Low
Alert 2	Safety configuration parameters were restored from factory defaults	Low
Alert 3	Configuration parameters were restored from factory defaults	Low
Alert 3	Configuration parameters were restored from factory defaults	Low
Alert 4	Invalid Factory Invisibility PCB was detected	Low
Alert 4	Invalid Factory Invisibility PCB was detected	Low
Alert 5	Invalid Factory Range PCB was detected	Low
Alert 5	Invalid Factory Range PCB was detected	Low
Alert 6	Invalid range PCB record has been dropped	Low
Alert 6	Invalid range PCB record has been dropped	Low
Alert 7	EEPROM lockout history was initialized	Low
Alert 7	EEPROM lockout history was initialized	Low
Alert 8	Switched application annunciation data blocks	Low
Alert 8	Switched application annunciation data blocks	Low
Alert 9	Switched application configuration data blocks	Low
Alert 9	Switched application configuration data blocks	Low
Alert 10	Configuration was restored from factory defaults	Low
Alert 10	Configuration was restored from factory defaults	Low
Alert 11	Backup configuration settings was restored from active configuration	Low
Alert 11	Backup configuration settings was restored from active configuration	Low
Alert 12	Annunciation configuration was restored from factory defaults	Low
Alert 12	Annunciation configuration was restored from factory defaults	Low
Alert 13	Annunciation configuration was restored from backup	Low
Alert 13	Annunciation configuration was restored from backup	Low
Alert 14	Safety group verification table was restored from factory defaults	Low
Alert 14	Safety group verification table was restored from factory defaults	Low
Alert 15	Safety group verification table was updated	Low
Alert 15	Safety group verification table was updated	Low
Alert 16	Invalid Parameter PCB was detected	Low
Alert 16	Invalid Parameter PCB was detected	Low
Alert 17	Invalid Range PCB was detected	Low
Alert 17	Invalid Range PCB was detected	Low
Alert 18	Alarm silence time exceeded maximum	Low
Alert 18	Alarm silence time exceeded maximum	Low
Alert 19	Invalid safety group verification table was detected	Low
Alert 19	Invalid safety group verification table was detected	Low
Alert 20	Backdoor password could not be determined	Low
Alert 21	Invalid safety group verification table was not accepted	Low
Alert 22	CRC errors were found in application configuration data blocks	Low
Alert 23	Backup Alert PCB was restored from active one	Low
Alert 25	Lead Lag operation switch was turned OFF	Low
Alert 26	Lead Lag operation switch was turned ON	Low
Alert 27	Safety processor was reset	Low
Alert 27	Safety processor was reset	Low
Alert 28	Application processor was reset	Low
Alert 28	Application processor was reset	Low
Alert 29	Burner switch was turned OFF	Low
Alert 29	Burner switch was turned OFF	Low
Alert 30	Burner switch was turned ON	Low
Alert 30	Burner switch was turned ON	Low
Alert 31	Program Module (PM) was inserted into socket	Low
Alert 31	Program Module (PM) was inserted into socket	Low
Alert 32	Program Module (PM) was removed from socket	Low
Alert 32	Program Module (PM) was removed from socket	Low
Alert 33	Alert PCB was configured	Low
Alert 33	Alert PCB was configured	Low
Alert 34	Parameter PCB was configured	Low
Alert 34	Parameter PCB was configured	Low
Alert 35	Range PCB was configured	Low
Alert 35	Range PCB was configured	Low
Alert 36	Program Module (PM) incompatible with product was inserted into socket	Low
Alert 36	Program Module (PM) incompatible with product was inserted into socket	Low
Alert 37	Program Module application parameter revision differs from application processor	Low
Alert 37	Program Module application parameter revision differs from application processor	Low
Alert 38	Program Module safety parameter revision differs from safety processor	Low
Alert 38	Program Module safety parameter revision differs from safety processor	Low
Alert 39	PCB incompatible with product contained in Program Module	Low
Alert 39	PCB incompatible with product contained in Program Module	Low
Alert 40	Parameter PCB in Program Module is too large for product	Low
Alert 40	Parameter PCB in Program Module is too large for product	Low
Alert 41	Range PCB in Program Module was too large for product	Low
Alert 41	Range PCB in Program Module was too large for product	Low
Alert 42	Alert PCB in Program Module was too large for product	Low
Alert 42	Alert PCB in Program Module was too large for product	Low
Alert 43	IAS start check was forced on due to IAS enabled	Low
Alert 43	IAS start check was forced on due to IAS enabled	Low
Alert 44	Low voltage was detected in safety processor	Low
Alert 44	Low voltage was detected in safety processor	Low
Alert 45	High line frequency occurred	Low
Alert 45	High line frequency occurred	Low
Alert 46	Low line frequency occurred	Low
Alert 46	Low line frequency occurred	Low
Alert 47	Invalid subsystem reset request occurred	Low
Alert 47	Invalid subsystem reset request occurred	Low
Alert 48	Write large enumerated Modbus register value was not allowed	Low
Alert 48	Write large enumerated Modbus register value was not allowed	Low
Alert 49	Maximum cycle count was reached	Low
Alert 49	Maximum cycle count was reached	Low
Alert 50	Maximum hours count was reached	Low
Alert 50	Maximum hours count was reached	Low
Alert 51	Illegal Modbus write was attempted	Low
Alert 51	Illegal Modbus write was attempted	Low
Alert 52	Modbus write attempt was rejected (NOT ALLOWED)	Low
Alert 52	Modbus write attempt was rejected (NOT ALLOWED)	Low
Alert 53	Illegal Modbus read was attempted	Low
Alert 53	Illegal Modbus read was attempted	Low
Alert 54	Safety processor brown-out reset occurred	Low
Alert 54	Safety processor brown-out reset occurred	Low
Alert 55	Application processor watchdog reset occurred	Low
Alert 55	Application processor watchdog reset occurred	Low
Alert 56	Application processor brown-out reset occurred	Low
Alert 56	Application processor brown-out reset occurred	Low
Alert 57	Safety processor watchdog reset occurred	Low
Alert 57	Safety processor watchdog reset occurred	Low
Alert 58	Alarm was reset by the user at the control	Low
Alert 58	Alarm was reset by the user at the control	Low
Alert 59	Burner control firing rate was > absolute max rate	Low
Alert 59	Burner control firing rate was > absolute max rate	Low
Alert 60	Burner control firing rate was < absolute min rate	Low
Alert 60	Burner control firing rate was < absolute min rate	Low
Alert 61	Burner control firing rate was invalid, % vs. RPM	Low
Alert 61	Burner control firing rate was invalid, % vs. RPM	Low
Alert 62	Burner control was firing with no fan request	Low
Alert 62	Burner control was firing with no fan request	Low
Alert 63	Burner control rate (non-firing) was > absolute max rate	Low
Alert 63	Burner control rate (non-firing) was > absolute max rate	Low
Alert 64	Burner control rate (non-firing) was < absolute min rate	Low
Alert 64	Burner control rate (non-firing) was < absolute min rate	Low
Alert 65	Burner control rate (non-firing) was absent	Low
Alert 65	Burner control rate (non-firing) was absent	Low
Alert 66	Burner control rate (non-firing) was invalid, % vs. RPM	Low
Alert 66	Burner control rate (non-firing) was invalid, % vs. RPM	Low
Alert 67	Fan off cycle rate was invalid, % vs. RPM	Low
Alert 67	Fan off cycle rate was invalid, % vs. RPM	Low
Alert 68	Set point was over ridden due to sensor fault	Low
Alert 68	Set point was over ridden due to sensor fault	Low
Alert 69	Modulation was over ridden due to sensor fault	Low
Alert 69	Modulation was over ridden due to sensor fault	Low
Alert 70	No demand source was set due to demand priority conflicts	Low
Alert 70	No demand source was set due to demand priority conflicts	Low
Alert 71	CH 4-20mA signal was invalid.	Low
Alert 71	CH 4-20mA signal was invalid.	Low
Alert 72	Flame strength rate differential was invalid	Low
Alert 73	Flame strength step rate was invalid	Low
Alert 74	Periodic forced recycle	Low
Alert 74	Periodic forced recycle	Low
Alert 75	Absolute max fan speed was out of range	Low
Alert 75	Absolute max fan speed was out of range	Low
Alert 76	Absolute min fan speed was out of range	Low
Alert 76	Absolute min fan speed was out of range	Low
Alert 77	Fan gain down was invalid	Low
Alert 77	Fan gain down was invalid	Low
Alert 78	Fan gain up was invalid	Low
Alert 78	Fan gain up was invalid	Low
Alert 79	Fan minimum duty cycle was invalid	Low
Alert 79	Fan minimum duty cycle was invalid	Low
Alert 80	Fan pulses per revolution was invalid	Low
Alert 80	Fan pulses per revolution was invalid	Low
Alert 81	Fan PWM frequency was invalid	Low
Alert 81	Fan PWM frequency was invalid	Low
Alert 84	Lead Lag CH 4-20mA water temperature setting was invalid	Low
Alert 85	No Lead Lag add stage error threshold was configured	Low
Alert 86	No Lead Lag add stage detection time was configured	Low
Alert 87	No Lead Lag drop stage error threshold was configured	Low
Alert 88	No Lead Lag drop stage detection time was configured	Low
Alert 89	Lead Lag all boiler off threshold was invalid	Low
Alert 90	Modulation output type was invalid	Low
Alert 90	Modulation output type was invalid	Low
Alert 91	Firing rate control parameter was invalid	Low
Alert 91	Firing rate control parameter was invalid	Low
Alert 92	Forced rate was out of range vs. min/max modulation	Low
Alert 92	Forced rate was out of range vs. min/max modulation	Low
Alert 93	Forced rate was invalid, % vs. RPM	Low
Alert 93	Forced rate was invalid, % vs. RPM	Low
Alert 94	Slow start ramp value was invalid	Low
Alert 94	Slow start ramp value was invalid	Low
Alert 95	Slow start degrees value was invalid	Low
Alert 95	Slow start degrees value was invalid	Low
Alert 96	Slow start was ended due to outlet sensor fault	Low
Alert 96	Slow start was ended due to outlet sensor fault	Low
Alert 97	Slow start was end due to reference set point fault	Low
Alert 97	Slow start was end due to reference set point fault	Low
Alert 98	CH max modulation rate was invalid, % vs. RPM	Low
Alert 98	CH max modulation rate was invalid, % vs. RPM	Low
Alert 99	CH max modulation rate was > absolute max rate	Low
Alert 99	CH max modulation rate was > absolute max rate	Low
Alert 100	CH modulation range (max minus min) was too small (< 4% or 40 RPM)	Low
Alert 100	CH modulation range (max minus min) was too small (< 4% or 40 RPM)	Low
Alert 101	DHW max modulation rate was invalid, % vs. RPM	Low
Alert 101	DHW max modulation rate was invalid, % vs. RPM	Low
Alert 102	DHW max modulation rate was > absolute max rate	Low
Alert 102	DHW max modulation rate was > absolute max rate	Low
Alert 103	DHW modulation range (max minus min) was too small (< 4% or 40 RPM)	Low
Alert 103	DHW modulation range (max minus min) was too small (< 4% or 40 RPM)	Low
Alert 104	Min modulation rate was < absolute min rate	Low
Alert 104	Min modulation rate was < absolute min rate	Low
Alert 105	Min modulation rate was invalid, % vs. RPM	Low
Alert 105	Min modulation rate was invalid, % vs. RPM	Low
Alert 106	Manual rate was invalid, % vs. RPM	Low
Alert 106	Manual rate was invalid, % vs. RPM	Low
Alert 107	Slow start enabled, but forced rate was invalid	Low
Alert 107	Slow start enabled, but forced rate was invalid	Low
Alert 108	Analog output hysteresis was invalid	Low
Alert 108	Analog output hysteresis was invalid	Low
Alert 109	Analog modulation output type was invalid	Low
Alert 109	Analog modulation output type was invalid	Low
Alert 110	IAS open rate differential was invalid	Low
Alert 110	IAS open rate differential was invalid	Low
Alert 111	IAS open step rate was invalid	Low
Alert 111	IAS open step rate was invalid	Low
Alert 112	Mix max modulation rate was invalid, % vs. RPM	Low
Alert 113	Mix max modulation rate was > absolute max or < absolute min rates	Low
Alert 114	Mix modulation range (max minus min) was too small (< 4% or 40 RPM)	Low
Alert 115	Fan was limited to its minimum duty cycle	Low
Alert 115	Fan was limited to its minimum duty cycle	Low
Alert 116	Manual rate was > CH max modulation rate	Low
Alert 116	Manual rate was > CH max modulation rate	Low
Alert 117	Manual rate was > DHW max modulation rate	Low
Alert 117	Manual rate was > DHW max modulation rate	Low
Alert 118	Manual rate was < min modulation rate	Low
Alert 118	Manual rate was < min modulation rate	Low
Alert 119	Manual rate in Standby was > absolute max rate	Low
Alert 119	Manual rate in Standby was > absolute max rate	Low
Alert 120	Modulation commanded rate was > CH max modulation rate	Low
Alert 120	Modulation commanded rate was > CH max modulation rate	Low
Alert 121	Modulation commanded rate was > DHW max modulation rate	Low
Alert 121	Modulation commanded rate was > DHW max modulation rate	Low
Alert 122	Modulation commanded rate was < min modulation rate	Low
Alert 122	Modulation commanded rate was < min modulation rate	Low
Alert 123	Modulation rate was limited due to outlet limit	Low
Alert 123	Modulation rate was limited due to outlet limit	Low
Alert 124	Modulation rate was limited due to Delta-T limit	Low
Alert 124	Modulation rate was limited due to Delta-T limit	Low
Alert 125	Modulation rate was limited due to stack limit	Low
Alert 125	Modulation rate was limited due to stack limit	Low
Alert 126	Modulation rate was limited due to anti-condensation	Low
Alert 126	Modulation rate was limited due to anti-condensation	Low
Alert 127	Fan Speed out of range in RUN	Low
Alert 127	Fan Speed out of range in RUN	Low
Alert 128	Modulation limited - air switch open	Low
Alert 128	Modulation limited - air switch open	Low
Alert 129	Slow start ramp setting of zero will result in no modulation rate change	Low
Alert 129	Slow start ramp setting of zero will result in no modulation rate change	Low
Alert 130	No forced rate was configured for slow start ramp	Low
Alert 130	No forced rate was configured for slow start ramp	Low
Alert 131	CH demand source was invalid	Low
Alert 131	CH demand source was invalid	Low
Alert 132	CH P-gain was invalid	Low
Alert 132	CH P-gain was invalid	Low
Alert 133	CH I-gain was invalid	Low
Alert 133	CH I-gain was invalid	Low
Alert 134	CH D-gain was invalid	Low
Alert 134	CH D-gain was invalid	Low
Alert 135	CH OFF hysteresis was invalid	Low
Alert 135	CH OFF hysteresis was invalid	Low
Alert 136	CH ON hysteresis was invalid	Low
Alert 136	CH ON hysteresis was invalid	Low
Alert 137	CH sensor type was invalid	Low
Alert 137	CH sensor type was invalid	Low
Alert 138	CH hysteresis step time was invalid	Low
Alert 138	CH hysteresis step time was invalid	Low
Alert 139	CH remote control parameter was invalid	Low
Alert 139	CH remote control parameter was invalid	Low
Alert 140	CH ODR not allowed with remote control	Low
Alert 140	CH ODR not allowed with remote control	Low
Alert 146	CH control was suspended due to fault	Low
Alert 146	CH control was suspended due to fault	Low
Alert 147	CH header temperature was invalid	Low
Alert 147	CH header temperature was invalid	Low
Alert 148	CH outlet temperature was invalid	Low
Alert 148	CH outlet temperature was invalid	Low
Alert 149	CH steam pressure was invalid	Low
Alert 149	CH steam pressure was invalid	Low
Alert 151	Minimum water temperature parameter was greater than setpoint	Low
Alert 152	Minimum water temperature parameter was greater than time of day setpoint	Low
Alert 155	CH modulation rate source parameter was invalid	Low
Alert 157	DHW demand source was invalid	Low
Alert 157	DHW demand source was invalid	Low
Alert 158	DHW P-gain was invalid	Low
Alert 158	DHW P-gain was invalid	Low
Alert 159	DHW I-gain was invalid	Low
Alert 159	DHW I-gain was invalid	Low
Alert 160	DHW D-gain was invalid	Low
Alert 160	DHW D-gain was invalid	Low
Alert 161	DHW OFF hysteresis was invalid	Low
Alert 161	DHW OFF hysteresis was invalid	Low
Alert 162	DHW ON hysteresis was invalid	Low
Alert 162	DHW ON hysteresis was invalid	Low
Alert 163	DHW hysteresis step time was invalid	Low
Alert 163	DHW hysteresis step time was invalid	Low
Alert 164	DHW sensor type was invalid	Low
Alert 164	DHW sensor type was invalid	Low
Alert 165	Inlet sensor type was invalid for DHW	Low
Alert 165	Inlet sensor type was invalid for DHW	Low
Alert 166	Outlet sensor type was invalid for DHW	Low
Alert 166	Outlet sensor type was invalid for DHW	Low
Alert 167	DHW storage OFF hysteresis was invalid	Low
Alert 168	DHW storage ON hysteresis was invalid	Low
Alert 169	DHW modulation sensor type was invalid	Low
Alert 170	DHW modulation sensor was not compatible for Auto mode	Low
Alert 171	DHW control was suspended due to fault	Low
Alert 171	DHW control was suspended due to fault	Low
Alert 172	DHW temperature was invalid	Low
Alert 172	DHW temperature was invalid	Low
Alert 173	DHW inlet temperature was invalid	Low
Alert 173	DHW inlet temperature was invalid	Low
Alert 174	DHW outlet temperature was invalid	Low
Alert 174	DHW outlet temperature was invalid	Low
Alert 175	DHW high limit must be disabled for Auto mode	Low
Alert 176	DHW sensor type was not compatible for Auto mode	Low
Alert 177	DHW priority source setting was invalid	Low
Alert 178	DHW priority method setting was invalid	Low
Alert 179	CH S5 (J8-11) sensor was invalid	Low
Alert 180	CH Inlet temperature was invalid	Low
Alert 181	CH S10 (J10-7) sensor was invalid	Low
Alert 182	Lead Lag CH setpoint source was invalid	Low
Alert 183	Lead Lag P-gain was invalid	Low
Alert 183	Lead Lag P-gain was invalid	Low
Alert 184	Lead Lag I-gain was invalid	Low
Alert 184	Lead Lag I-gain was invalid	Low
Alert 185	Lead Lag D-gain was invalid	Low
Alert 185	Lead Lag D-gain was invalid	Low
Alert 186	Lead Lag OFF hysteresis was invalid	Low
Alert 186	Lead Lag OFF hysteresis was invalid	Low
Alert 187	Lead Lag ON hysteresis was invalid	Low
Alert 187	Lead Lag ON hysteresis was invalid	Low
Alert 188	Lead Lag slave enable was invalid	Low
Alert 188	Lead Lag slave enable was invalid	Low
Alert 189	Lead Lag hysteresis step time was invalid	Low
Alert 189	Lead Lag hysteresis step time was invalid	Low
Alert 190	No Lead Lag Modbus port was assigned	Low
Alert 191	Lead Lag base load common setting was invalid	Low
Alert 192	Lead Lag DHW demand switch setting was invalid	Low
Alert 193	Lead Lag Mix demand switch setting was invalid	Low
Alert 194	Lead Lag modulation sensor setting was invalid	Low
Alert 195	Lead Lag backup modulation sensor setting was invalid	Low
Alert 196	Lead Lag slave mode setting was invalid	Low
Alert 197	Lead Lag rate allocation setting was invalid	Low
Alert 198	Lead selection setting was invalid	Low
Alert 204	Lead Lag master was suspended due to fault	Low
Alert 205	Lead Lag slave was suspended due to fault	Low
Alert 206	Lead-lag header temperature invalid	Low
Alert 206	Lead-lag header temperature invalid	Low
Alert 207	Lead Lag was suspended due to no enabled Program Module installed	Low
Alert 208	Lead Lag slave session has timed out	Low
Alert 222	CH frost protection temperature was invalid	Low
Alert 223	CH frost protection inlet temperature was invalid	Low
Alert 224	DHW frost protection temperature was invalid	Low
Alert 231	LL set point was invalid	Low
Alert 232	LL time of day set point was invalid	Low
Alert 233	Lead-lag outdoor temperature invalid	Low
Alert 233	Lead-lag outdoor temperature invalid	Low
Alert 234	LL ODR time of day set point was invalid	Low
Alert 235	LL ODR time of day set point exceeded normal set point	Low
Alert 236	LL max outdoor set point was invalid	Low
Alert 237	LL min outdoor set point was invalid	Low
Alert 238	LL min water set point was invalid	Low
Alert 239	LL outdoor temperature range was too small (minimum 12 C / 22 F)	Low
Alert 240	LL water temperature range was too small (minimum 12 C / 22 F)	Low
Alert 246	CH set point was invalid	Low
Alert 247	CH time of day set point was invalid	Low
Alert 248	CH outdoor temperature invalid	Low
Alert 248	CH outdoor temperature invalid	Low
Alert 249	CH ODR time of day setpoint was invalid	Low
Alert 250	CH ODR time of day set point exceeds normal set point	Low
Alert 251	CH max outdoor set point was invalid	Low
Alert 252	CH min outdoor setp oint was invalid	Low
Alert 253	CH min water set point was invalid	Low
Alert 254	CH outdoor temperature range was too small (minimum 12 C / 22 F)	Low
Alert 255	CH water temperature range was too small (minimum 12 C / 22 F)	Low
Alert 261	DHW set point was invalid	Low
Alert 262	DHW time of day set point was invalid	Low
Alert 272	Abnormal Recycle: Pressure sensor fault	Low
Alert 273	Abnormal Recycle: Safety relay drive test failed	Low
Alert 274	Abnormal Recycle: Demand off during Pilot Flame Establishing Period	Low
Alert 275	Abnormal Recycle: LCI off during Drive to Purge Rate	Low
Alert 276	Abnormal Recycle: LCI off during Measured Purge Time	Low
Alert 277	Abnormal Recycle: LCI off during Drive to Light off Rate	Low
Alert 278	Abnormal Recycle: LCI off during Pre-Ignition test	Low
Alert 279	Abnormal Recycle: LCI off during Pre-Ignition time	Low
Alert 280	Abnormal Recycle: LCI off during Main Flame Establishing Period	Low
Alert 281	Abnormal Recycle: LCI off during Ignition period	Low
Alert 282	Abnormal Recycle: Demand off during Drive to Purge Rate	Low
Alert 283	Abnormal Recycle: Demand off during Measured Purge Time	Low
Alert 284	Abnormal Recycle: Demand off during Drive to Light off Rate	Low
Alert 285	Abnormal Recycle: Demand off during Pre-Ignition test	Low
Alert 286	Abnormal Recycle: Demand off during Pre-Ignition time	Low
Alert 287	Abnormal Recycle: Flame was on during Safe Start check	Low
Alert 288	Abnormal Recycle: Flame was on during Drive to Purge Rate	Low
Alert 289	Abnormal Recycle: Flame was on during Measured Purge Time	Low
Alert 290	Abnormal Recycle: Flame was on during Drive to Light off Rate	Low
Alert 291	Abnormal Recycle: Flame was not on at end of Ignition period	Low
Alert 292	Abnormal Recycle: Flame was lost during Main Flame Establishing Period	Low
Alert 293	Abnormal Recycle: Flame was lost early in Run	Low
Alert 294	Abnormal Recycle: Flame was lost during Run	Low
Alert 295	Abnormal Recycle: Leakage test failed	Low
Alert 296	Abnormal Recycle: Interrupted air flow switch was off during Drive to Purge Rate	Low
Alert 297	Abnormal Recycle: Interrupted air flow switch was off during Measured Purge Time	Low
Alert 298	Abnormal Recycle: Interrupted air flow switch was off during Drive to Light off Rate	Low
Alert 299	Abnormal Recycle: Interrupted air flow switch was off during Pre-Ignition test	Low
Alert 300	Abnormal Recycle: Interrupted air flow switch was off during Pre-Ignition time	Low
Alert 301	Abnormal Recycle: Interrupted air flow switch was off during Main Flame Establishing Period	Low
Alert 302	Abnormal Recycle: Ignition failed due to interrupted air flow switch was off	Low
Alert 303	Abnormal Recycle: ILK off during Drive to Purge Rate	Low
Alert 304	Abnormal Recycle: ILK off during Measured Purge Time	Low
Alert 305	Abnormal Recycle: ILK off during Drive to Light off Rate	Low
Alert 306	Abnormal Recycle: ILK off during Pre-Ignition test	Low
Alert 307	Abnormal Recycle: ILK off during Pre-Ignition time	Low
Alert 308	Abnormal Recycle: ILK off during Main Flame Establishing Period	Low
Alert 309	Abnormal Recycle: ILK off during Ignition period	Low
Alert 310	Run was terminated due to ILK was off	Low
Alert 311	Run was terminated due to interrupted air flow switch was off	Low
Alert 312	Stuck reset switch	Low
Alert 313	Run was terminated due to fan failure	Low
Alert 314	Abnormal Recycle: Fan failed during Drive to Purge Rate	Low
Alert 315	Abnormal Recycle: Fan failed during Measured Purge Time	Low
Alert 316	Abnormal Recycle: Fan failed during Drive to Light off Rate	Low
Alert 317	Abnormal Recycle: Fan failed during Pre-Ignition test	Low
Alert 318	Abnormal Recycle: Fan failed during Pre-Ignition time	Low
Alert 319	Abnormal Recycle: Fan failed during Ignition period	Low
Alert 320	Abnormal Recycle: Fan failed during Main Flame Establishing Period	Low
Alert 321	Abnormal Recycle: Main Valve off after 10 seconds of RUN	Low
Alert 322	Abnormal Recycle: Pilot Valve off after 10 seconds of RUN	Low
Alert 323	Abnormal Recycle: Safety Relay off after 10 seconds of RUN	Low
Alert 324	Abnormal Recycle: Hardware flame bias	Low
Alert 325	Abnormal Recycle: Hardware static flame	Low
Alert 326	Abnormal Recycle: Hardware flame current invalid	Low
Alert 327	Abnormal Recycle: Hardware flame rod short	Low
Alert 328	Abnormal Recycle: Hardware invalid power	Low
Alert 329	Abnormal Recycle: Hardware invalid AC line	Low
Alert 330	Abnormal Recycle: Hardware SLO flame ripple	Low
Alert 331	Abnormal Recycle: Hardware SLO flame sample	Low
Alert 332	Abnormal Recycle: Hardware SLO flame bias range	Low
Alert 333	Abnormal Recycle: Hardware SLO flame bias heat	Low
Alert 334	Abnormal Recycle: Hardware SLO spark stuck	Low
Alert 335	Abnormal Recycle: Hardware SLO spark changed	Low
Alert 336	Abnormal Recycle: Hardware SLO static flame	Low
Alert 337	Abnormal Recycle: Hardware SLO rod shorted	Low
Alert 338	Abnormal Recycle: Hardware SLO AD linearity	Low
Alert 339	Abnormal Recycle: Hardware SLO bias not set	Low
Alert 340	Abnormal Recycle: Hardware SLO bias shorted	Low
Alert 341	Abnormal Recycle: Hardware SLO electronics	Low
Alert 342	Abnormal Recycle: Hardware processor clock	Low
Alert 343	Abnormal Recycle: Hardware AC phase	Low
Alert 344	Abnormal Recycle: Hardware A2D mismatch	Low
Alert 345	Abnormal Recycle: Hardware VSNSR A2D	Low
Alert 346	Abnormal Recycle: Hardware 28V A2D	Low
Alert 347	Abnormal Recycle: Hardware HFS IAS shorted	Low
Alert 348	Abnormal Recycle: Hardware PII INTLK shorted	Low
Alert 349	Abnormal Recycle: Hardware HFS LCI shorted	Low
Alert 350	Abnormal Recycle: Hardware HFS LFS shorted	Low
Alert 351	Abnormal Recycle: Invalid zero crossing	Low
Alert 352	Abnormal Recycle: fault stack sensor	Low
Alert 353	Abnormal Recycle: stack limit	Low
Alert 354	Abnormal Recycle: delta T limit	Low
Alert 355	Abnormal Recycle: fault outlet sensor	Low
Alert 356	Abnormal Recycle: outlet high limit	Low
Alert 357	Abnormal Recycle: fault DHW sensor	Low
Alert 358	Abnormal Recycle: DHW high limit	Low
Alert 359	Abnormal Recycle: fault inlet sensor	Low
Alert 360	Abnormal Recycle: Check Parameters Failed	Low
Alert 361	Internal error: No factory parameters were detected in control	Low
Alert 362	Internal error: PID iteration frequency was invalid	Low
Alert 363	Internal error: Demand-Rate interval time was invalid	Low
Alert 364	Internal error: Factory calibration parameter for modulation was invalid	Low
Alert 365	Internal error: CH PID P-scaler was invalid	Low
Alert 366	Internal error: CH PID I-scaler was invalid	Low
Alert 367	Internal error: CH PID D-scaler was invalid	Low
Alert 368	Internal error: DHW PID P-scaler was invalid	Low
Alert 369	Internal error: DHW PID I-scaler was invalid	Low
Alert 370	Internal error: DHW PID D-scaler was invalid	Low
Alert 371	Internal error: Lead Lag master PID P-scaler was invalid	Low
Alert 372	Internal error: Lead Lag master PID I-scaler was invalid	Low
Alert 373	Internal error: Lead Lag master PID D-scaler was invalid	Low
Alert 448	Flame too low - burner shut down	Medium
Alert 449	Modulation limited by flame strength	Low
Alert 449	Modulation limited by flame strength	Low
Alert 460	LCI demand lost in run	Low
Alert 461	Demand lost in run	Low
Alert 462	STAT demand lost in run	Low
Alert 463	Demand lost in run due to no flame	Low
Alert 467	Internal error: EEPROM write was attempted before EEPROM was initialized	Low
Alert 468	Internal error: EEPROM cycle count address was invalid	Low
Alert 469	Internal error: EEPROM days count address was invalid	Low
Alert 470	Internal error: EEPROM hours count address was invalid	Low
Alert 471	Internal error: Lockout record EEPROM index was invalid	Low
Alert 472	Internal error: Request to write PM status was invalid	Low
Alert 473	Internal error: PM parameter address was invalid	Low
Alert 474	Internal error: PM safety parameter address was invalid	Low
Alert 475	Internal error: Invalid record in lockout history was removed	Low
Alert 476	Internal error: EEPROM write buffer was full	Low
Alert 477	Internal error: Data too large was not written to EEPROM	Low
Alert 478	Internal error: Safety key bit 0 was incorrect	Low
Alert 479	Internal error: Safety key bit 1 was incorrect	Low
Alert 480	Internal error: Safety key bit 2 was incorrect	Low
Alert 481	Internal error: Safety key bit 3 was incorrect	Low
Alert 482	Internal error: Safety key bit 4 was incorrect	Low
Alert 483	Internal error: Safety key bit 5 was incorrect	Low
Alert 484	Internal error: Safety key bit 6 was incorrect	Low
Alert 485	Internal error: Safety key bit 7 was incorrect	Low
Alert 486	Internal error: Safety key bit 8 was incorrect	Low
Alert 487	Internal error: Safety key bit 9 was incorrect	Low
Alert 488	Internal error: Safety key bit 10 was incorrect	Low
Alert 489	Internal error: Safety key bit 11 was incorrect	Low
Alert 490	Internal error: Safety key bit 12 was incorrect	Low
Alert 491	Internal error: Safety key bit 13 was incorrect	Low
Alert 492	Internal error: Safety key bit 14 was incorrect	Low
Alert 493	Internal error: Safety key bit 15 was incorrect	Low
Alert 494	Internal error: Safety relay timeout	Low
Alert 495	Internal error: Safety relay commanded off	Low
Alert 496	Internal error: Unknown safety error occurred	Low
Alert 497	Internal error: Safety timer was corrupt	Low
Alert 498	Internal error: Safety timer was expired	Low
Alert 499	Internal error: Safety timings	Low
Alert 500	Internal error: Safety shutdown	Low
Hold / Lockout 9	Flame bias out of range	High
Hold / Lockout 9	Flame bias out of range	High
Hold / Lockout 13	Internal fault: PII shorted to ILK	High
Hold / Lockout 13	Internal fault: PII shorted to ILK	High
Hold / Lockout 14	Internal fault: HFS shorted to LCI	High
Hold / Lockout 14	Internal fault: HFS shorted to LCI	High
Hold / Lockout 67	ILK off - interlock string open	Critical
Hold / Lockout 67	ILK off - interlock string open	Critical
Hold / Lockout 79	Outlet high limit	Critical
Hold / Lockout 79	Outlet high limit	Critical
Hold / Lockout 81	Delta T limit	High
Hold / Lockout 81	Delta T limit	High
Hold / Lockout 85	Inlet/outlet inversion limit	High
Hold / Lockout 85	Inlet/outlet inversion limit	High
Hold / Lockout 88	Outlet temperature rise limit	High
Hold / Lockout 88	Outlet temperature rise limit	High
Hold / Lockout 105	Flame detected out of sequence	High
Hold / Lockout 105	Flame detected out of sequence	High
Hold / Lockout 128	Fan speed failed during pre-purge	High
Hold / Lockout 128	Fan speed failed during pre-purge	High
Hold / Lockout 129	Fan speed failed during pre-ignition	High
Hold / Lockout 129	Fan speed failed during pre-ignition	High
Hold / Lockout 130	Fan speed failed during ignition	High
Hold / Lockout 130	Fan speed failed during ignition	High
Hold / Lockout 149	Flame detected	High
Hold / Lockout 149	Flame detected	High
Hold / Lockout 151	High fire switch ON	High
Hold / Lockout 151	High fire switch ON	High
Hold / Lockout 152	Combustion pressure ON	High
Hold / Lockout 152	Combustion pressure ON	High
Hold / Lockout 153	Combustion pressure OFF	High
Hold / Lockout 153	Combustion pressure OFF	High
Hold / Lockout 154	Purge fan switch ON	High
Hold / Lockout 154	Purge fan switch ON	High
Hold / Lockout 155	Purge fan switch OFF	High
Hold / Lockout 155	Purge fan switch OFF	High
Hold / Lockout 156	Combustion pressure and Flame ON	High
Hold / Lockout 156	Combustion pressure and Flame ON	High
Hold / Lockout 240	Invalid Outdoor connector type setting	High
Hold / Lockout 243	Invalid UV with spark interference not compatible with Igniter on throughout	High
Hold 3	Internal fault: Hardware fault	Medium
Hold 3	Internal fault: Hardware fault	Medium
Hold 4	Internal fault: Safety Relay key feedback error	Medium
Hold 4	Internal fault: Safety Relay key feedback error	Medium
Hold 5	Internal fault: Unstable power (DCDC) output	Medium
Hold 5	Internal fault: Unstable power (DCDC) output	Medium
Hold 6	Internal fault: Invalid processor clock	Medium
Hold 6	Internal fault: Invalid processor clock	Medium
Hold 7	Internal fault: Safety relay drive error	Medium
Hold 7	Internal fault: Safety relay drive error	Medium
Hold 8	Internal fault: Zero crossing not detected	Medium
Hold 8	Internal fault: Zero crossing not detected	Medium
Hold 12	Internal fault: Safety relay drive cap short	Medium
Hold 12	Internal fault: Safety relay drive cap short	Medium
Hold 20	Internal fault: Flame ripple and overflow	Medium
Hold 20	Internal fault: Flame ripple and overflow	Medium
Hold 21	Internal fault: Flame number of sample mismatch	Medium
Hold 21	Internal fault: Flame number of sample mismatch	Medium
Hold 22	Internal fault: Flame bias out of range	Medium
Hold 22	Internal fault: Flame bias out of range	Medium
Hold 23	Internal fault: Bias changed since heating cycle starts	Medium
Hold 23	Internal fault: Bias changed since heating cycle starts	Medium
Hold 24	Internal fault: Spark voltage stuck low or high	Medium
Hold 24	Internal fault: Spark voltage stuck low or high	Medium
Hold 25	Internal fault: Spark voltage changed too much during flame sensing time	Medium
Hold 25	Internal fault: Spark voltage changed too much during flame sensing time	Medium
Hold 26	Internal fault: Static flame ripple	Medium
Hold 26	Internal fault: Static flame ripple	Medium
Hold 27	Flame rod shorted to ground	Medium
Hold 27	Flame rod shorted to ground	Medium
Hold 28	Internal fault: A/D linearity test fails	Medium
Hold 28	Internal fault: A/D linearity test fails	Medium
Hold 29	Internal fault: Flame bias cannot be set in range	Medium
Hold 29	Internal fault: Flame bias cannot be set in range	Medium
Hold 30	Internal fault: Flame bias shorted to adjacent pin	Medium
Hold 30	Internal fault: Flame bias shorted to adjacent pin	Medium
Hold 31	Internal fault: SLO electronics unknown error	Medium
Hold 31	Internal fault: SLO electronics unknown error	Medium
Hold 47	Flame rod to ground leakage	Medium
Hold 47	Flame rod to ground leakage	Medium
Hold 48	Static flame (not flickering)	Medium
Hold 48	Static flame (not flickering)	Medium
Hold 49	24VAC voltage low/high	Medium
Hold 49	24VAC voltage low/high	Medium
Hold 50	Modulation fault	Medium
Hold 50	Modulation fault	Medium
Hold 51	Pump fault	Medium
Hold 51	Pump fault	Medium
Hold 52	Motor tachometer fault	Medium
Hold 52	Motor tachometer fault	Medium
Hold 61	Anti short-cycle delay	Low
Hold 61	Anti short-cycle delay	Low
Hold 62	Fan speed not proved	Medium
Hold 62	Fan speed not proved	Medium
Hold 63	LCI off (limit control input)	Medium
Hold 63	LCI off (limit control input)	Medium
Hold 65	Interrupted air switch off	Medium
Hold 65	Interrupted air switch off	Medium
Hold 66	Interrupted air switch on	Medium
Hold 66	Interrupted air switch on	Medium
Hold 69	Pilot test hold	Medium
Hold 69	Pilot test hold	Medium
Hold 70	Wait for leakage test completion	Medium
Hold 70	Wait for leakage test completion	Medium
Hold 78	Demand lost in run	Medium
Hold 78	Demand lost in run	Medium
Hold 91	Inlet sensor fault	Medium
Hold 91	Inlet sensor fault	Medium
Hold 92	Outlet sensor fault	Medium
Hold 92	Outlet sensor fault	Medium
Hold 93	DHW sensor fault	Medium
Hold 93	DHW sensor fault	Medium
Hold 94	Header sensor fault	Medium
Hold 94	Header sensor fault	Medium
Hold 95	Stack sensor fault	Medium
Hold 95	Stack sensor fault	Medium
Hold 96	Outdoor sensor fault	Medium
Hold 96	Outdoor sensor fault	Medium
Hold 100	Pressure sensor fault	Medium
Hold 100	Pressure sensor fault	Medium
Hold 110	Ignition failure occurred	Critical
Hold 110	Ignition failure occurred	Critical
Hold 111	Flame current lower than WEAK threshold	Medium
Hold 111	Flame current lower than WEAK threshold	Medium
Hold 118	Controller interaction system fault	Medium
Hold 119	Controller interaction communications fault	Medium
Hold 124	High fire switch OFF	Medium
Hold 124	High fire switch OFF	Medium
Hold 125	High fire switch stuck ON	Medium
Hold 125	High fire switch stuck ON	Medium
Hold 126	Low fire switch OFF	Medium
Hold 126	Low fire switch OFF	Medium
Hold 127	Low fire switch stuck ON	Medium
Hold 127	Low fire switch stuck ON	Medium
Hold 131	Fan movement detected during standby	Medium
Hold 131	Fan movement detected during standby	Medium
Hold 132	Fan speed failed during run	Medium
Hold 132	Fan speed failed during run	Medium
Hold 136	Interrupted Airflow Switch failed to close	Medium
Hold 136	Interrupted Airflow Switch failed to close	Medium
Hold 137	ILK failed to close	Medium
Hold 137	ILK failed to close	High
Hold 150	Flame not detected	Medium
Hold 150	Flame not detected	Medium
Lockout 1	Unconfigured safety data	High
Lockout 1	Unconfigured safety data	High
Lockout 2	Waiting for safety data verification	High
Lockout 2	Waiting for safety data verification	High
Lockout 10	Internal fault: Invalid Burner control state	High
Lockout 10	Internal fault: Invalid Burner control state	High
Lockout 11	Internal fault: Invalid Burner control state flag	High
Lockout 11	Internal fault: Invalid Burner control state flag	High
Lockout 15	Internal fault: Safety relay test failed due to feedback ON	High
Lockout 15	Internal fault: Safety relay test failed due to feedback ON	High
Lockout 16	Internal fault: Safety relay test failed due to safety relay OFF	High
Lockout 16	Internal fault: Safety relay test failed due to safety relay OFF	High
Lockout 17	Internal fault: Safety relay test failed due to safety relay not OFF	High
Lockout 17	Internal fault: Safety relay test failed due to safety relay not OFF	High
Lockout 18	Internal fault: Safety relay test failed due to feedback not ON	High
Lockout 18	Internal fault: Safety relay test failed due to feedback not ON	High
Lockout 19	Internal fault: Safety RAM write	High
Lockout 19	Internal fault: Safety RAM write	High
Lockout 32	Internal fault: Safety Key 0	High
Lockout 32	Internal fault: Safety Key 0	High
Lockout 33	Internal fault: Safety Key 1	High
Lockout 33	Internal fault: Safety Key 1	High
Lockout 34	Internal fault: Safety Key 2	High
Lockout 34	Internal fault: Safety Key 2	High
Lockout 35	Internal fault: Safety Key 3	High
Lockout 35	Internal fault: Safety Key 3	High
Lockout 36	Internal fault: Safety Key 4	High
Lockout 36	Internal fault: Safety Key 4	High
Lockout 37	Internal fault: Safety Key 5	High
Lockout 37	Internal fault: Safety Key 5	High
Lockout 38	Internal fault: Safety Key 6	High
Lockout 38	Internal fault: Safety Key 6	High
Lockout 39	Internal fault: Safety Key 7	High
Lockout 39	Internal fault: Safety Key 7	High
Lockout 40	Internal fault: Safety Key 8	High
Lockout 40	Internal fault: Safety Key 8	High
Lockout 41	Internal fault: Safety Key 9	High
Lockout 41	Internal fault: Safety Key 9	High
Lockout 42	Internal fault: Safety Key 10	High
Lockout 42	Internal fault: Safety Key 10	High
Lockout 43	Internal fault: Safety Key 11	High
Lockout 43	Internal fault: Safety Key 11	High
Lockout 44	Internal fault: Safety Key 12	High
Lockout 44	Internal fault: Safety Key 12	High
Lockout 45	Internal fault: Safety Key 13	High
Lockout 45	Internal fault: Safety Key 13	High
Lockout 46	Internal fault: Safety Key 14	High
Lockout 46	Internal fault: Safety Key 14	High
Lockout 53	AC inputs phase reversed	High
Lockout 53	AC inputs phase reversed	High
Lockout 54	Safety GVT model ID doesn��t match application��s model ID	High
Lockout 55	Application configuration data block CRC errors	High
Lockout 58	Internal fault: HFS shorted to IAS	High
Lockout 58	Internal fault: HFS shorted to IAS	High
Lockout 59	Internal fault: Mux pin shorted	High
Lockout 59	Internal fault: Mux pin shorted	High
Lockout 60	Internal fault: HFS shorted to LFS	High
Lockout 60	Internal fault: HFS shorted to LFS	High
Lockout 71	Input power frequency mismatch	High
Lockout 82	Stack limit	Critical
Lockout 82	Stack limit	Critical
Lockout 97	Internal fault: A2D mismatch	High
Lockout 97	Internal fault: A2D mismatch	High
Lockout 98	Internal fault: Exceeded VSNSR voltage tolerance	High
Lockout 98	Internal fault: Exceeded VSNSR voltage tolerance	High
Lockout 99	Internal fault: Exceeded 28V voltage tolerance	High
Lockout 99	Internal fault: Exceeded 28V voltage tolerance	High
Lockout 106	Flame lost in MFEP	High
Lockout 106	Flame lost in MFEP	High
Lockout 107	Flame lost early in run	High
Lockout 107	Flame lost early in run	High
Lockout 108	Flame lost in run	High
Lockout 108	Flame lost in run	High
Lockout 109	Ignition failed	Critical
Lockout 109	Ignition failed	Critical
Lockout 112	Pilot test flame timeout	High
Lockout 112	Pilot test flame timeout	High
Lockout 113	Flame circuit timeout	High
Lockout 113	Flame circuit timeout	High
Lockout 122	Light off rate proving failed	High
Lockout 122	Light-off rate proving failed	High
Lockout 123	Purge rate proving failed	High
Lockout 123	Purge rate proving failed	High
Lockout 138	Flame too low	High
Lockout 143	Internal fault: Flame bias out of range 1	High
Lockout 144	Internal fault: Flame bias out of range 2	High
Lockout 145	Internal fault: Flame bias out of range 3	High
Lockout 146	Internal fault: Flame bias out of range 4	High
Lockout 147	Internal fault: Flame bias out of range 5	High
Lockout 148	Internal fault: Flame bias out of range 6	High
Lockout 157	Combustion pressure and Flame OFF	High
Lockout 157	Combustion pressure and Flame OFF	High
Lockout 158	Main valve ON	High
Lockout 158	Main valve ON	High
Lockout 159	Main valve OFF	High
Lockout 159	Main valve OFF	High
Lockout 160	Ignition ON	High
Lockout 160	Ignition ON	High
Lockout 161	Ignition OFF	High
Lockout 161	Ignition OFF	High
Lockout 162	Pilot valve ON	High
Lockout 162	Pilot valve ON	High
Lockout 163	Pilot valve OFF	High
Lockout 163	Pilot valve OFF	High
Lockout 164	Block intake ON	High
Lockout 164	Block intake ON	High
Lockout 165	Block intake OFF	High
Lockout 165	Block intake OFF	High
Lockout 169	Safety opto bad in test state	High
Lockout 170	Safety relay opto feedback incorrect	High
Lockout 171	Safety relay feedback incorrect in run	High
Lockout 172	Main relay feedback incorrect	High
Lockout 172	Main relay feedback incorrect	High
Lockout 173	Pilot relay feedback incorrect	High
Lockout 173	Pilot relay feedback incorrect	Critical
Lockout 174	Safety relay feedback incorrect	Critical
Lockout 174	Safety relay feedback incorrect	Critical
Lockout 175	Safety relay open	High
Lockout 175	Safety relay open	High
Lockout 176	Main relay ON at safe start check	High
Lockout 176	Main relay ON at safe start check	High
Lockout 177	Pilot relay ON at safe start check	High
Lockout 177	Pilot relay ON at safe start check	High
Lockout 178	Safety relay ON at safe start check	High
Lockout 178	Safety relay ON at safe start check	High
Lockout 184	Invalid BLOWER/HSI output setting	High
Lockout 184	Invalid BLOWER/HSI output setting	High
Lockout 185	Invalid Delta T limit enable setting	High
Lockout 185	Invalid Delta T limit enable setting	High
Lockout 186	Invalid Delta T limit response setting	High
Lockout 186	Invalid Delta T limit response setting	High
Lockout 187	Invalid DHW high limit enable setting	High
Lockout 187	Invalid DHW high limit enable setting	High
Lockout 188	Invalid DHW high limit response setting	High
Lockout 188	Invalid DHW high limit response setting	High
Lockout 189	Invalid Flame sensor type setting	High
Lockout 189	Invalid Flame sensor type setting	High
Lockout 190	Invalid interrupted air switch enable setting	High
Lockout 190	Invalid interrupted air switch enable setting	High
Lockout 191	Invalid interrupted air switch start check enable setting	High
Lockout 191	Invalid interrupted air switch start check enable setting	High
Lockout 192	Invalid Igniter on during setting	High
Lockout 192	Invalid Igniter on during setting	High
Lockout 193	Invalid Ignite failure delay setting	High
Lockout 193	Invalid Ignite failure delay setting	High
Lockout 194	Invalid Ignite failure response setting	High
Lockout 194	Invalid Ignite failure response setting	High
Lockout 195	Invalid Ignite failure retries setting	High
Lockout 195	Invalid Ignite failure retries setting	High
Lockout 196	Invalid Ignition source setting	High
Lockout 196	Invalid Ignition source setting	High
Lockout 197	Invalid Interlock open response setting	High
Lockout 197	Invalid Interlock open response setting	High
Lockout 198	Invalid Interlock start check setting	High
Lockout 198	Invalid Interlock start check setting	High
Lockout 199	Invalid LCI enable setting	High
Lockout 199	Invalid LCI enable setting	High
Lockout 200	Invalid light off rate setting	High
Lockout 200	Invalid light off rate setting	High
Lockout 201	Invalid Light off rate proving setting	High
Lockout 201	Invalid Light off rate proving setting	High
Lockout 202	Invalid Main Flame Establishing Period time setting	High
Lockout 202	Invalid Main Flame Establishing Period time setting	High
Lockout 203	Invalid MFEP flame failure response setting	High
Lockout 203	Invalid MFEP flame failure response setting	High
Lockout 204	Invalid NTC sensor type setting	High
Lockout 204	Invalid NTC sensor type setting	High
Lockout 205	Invalid Outlet high limit response setting	High
Lockout 205	Invalid Outlet high limit response setting	High
Lockout 206	Invalid Pilot Flame Establishing Period setting	High
Lockout 206	Invalid Pilot Flame Establishing Period setting	High
Lockout 207	Invalid PII enable setting	High
Lockout 207	Invalid PII enable setting	High
Lockout 208	Invalid pilot test hold setting	High
Lockout 208	Invalid pilot test hold setting	High
Lockout 209	Invalid Pilot type setting	High
Lockout 209	Invalid Pilot type setting	High
Lockout 210	Invalid Post-purge time setting	High
Lockout 210	Invalid Post-purge time setting	High
Lockout 211	Invalid Power up with lockout setting	High
Lockout 211	Invalid Power up with lockout setting	High
Lockout 212	Invalid Pre-ignition time setting	High
Lockout 212	Invalid Pre-ignition time setting	High
Lockout 213	Invalid Pre-purge rate setting	High
Lockout 213	Invalid Pre-purge rate setting	High
Lockout 214	Invalid Pre-purge time setting	High
Lockout 214	Invalid Pre-purge time setting	High
Lockout 215	Invalid Purge rate proving setting	High
Lockout 215	Invalid Purge rate proving setting	High
Lockout 216	Invalid Run flame failure response setting	High
Lockout 216	Invalid Run flame failure response setting	High
Lockout 217	Invalid Run stabilization time setting	High
Lockout 217	Invalid Run stabilization time setting	High
Lockout 218	Invalid Stack limit enable setting	High
Lockout 218	Invalid Stack limit enable setting	High
Lockout 219	Invalid Stack limit response setting	High
Lockout 219	Invalid Stack limit response setting	High
Lockout 220	Unconfigured Delta T limit set point setting	High
Lockout 220	Unconfigured Delta T limit set point setting	High
Lockout 221	Unconfigured DHW high limit set point setting	High
Lockout 221	Unconfigured DHW high limit set point setting	High
Lockout 222	Unconfigured Outlet high limit set point setting	High
Lockout 222	Unconfigured Outlet high limit set point setting	High
Lockout 223	Unconfigured Stack limit set point setting	High
Lockout 223	Unconfigured Stack limit set point setting	High
Lockout 224	Invalid DHW demand source setting	High
Lockout 224	Invalid DHW demand source setting	High
Lockout 225	Invalid Flame threshold setting	High
Lockout 225	Invalid Flame threshold setting	High
Lockout 226	Invalid Outlet high limit set point setting	High
Lockout 226	Invalid Outlet high limit set point setting	High
Lockout 227	Invalid DHW high limit set point setting	High
Lockout 227	Invalid DHW high limit set point setting	High
Lockout 228	Invalid Stack limit set point setting	High
Lockout 228	Invalid Stack limit set point setting	High
Lockout 229	Invalid Modulation output setting	High
Lockout 229	Invalid Modulation output setting	High
Lockout 230	Invalid CH demand source setting	High
Lockout 230	Invalid CH demand source setting	High
Lockout 231	Invalid Delta T limit delay setting	High
Lockout 231	Invalid Delta T limit delay setting	High
Lockout 232	Invalid Pressure sensor type setting	High
Lockout 232	Invalid Pressure sensor type setting	High
Lockout 233	Invalid IAS closed response setting	High
Lockout 233	Invalid IAS closed response setting	High
Lockout 234	Invalid Outlet high limit enable setting	High
Lockout 234	Invalid Outlet high limit enable setting	High
Lockout 235	Invalid Outlet connector type setting	High
Lockout 235	Invalid Outlet connector type setting	High
Lockout 236	Invalid Inlet connector type setting	High
Lockout 236	Invalid Inlet connector type setting	High
Lockout 237	Invalid DHW connector type setting	High
Lockout 237	Invalid DHW connector type setting	High
Lockout 238	Invalid Stack connector type setting	High
Lockout 238	Invalid Stack connector type setting	High
Lockout 239	Invalid Header connector type setting	High
Lockout 239	Invalid Header connector type setting	High
Lockout 240	Invalid Outdoor connector type setting	High
Lockout 241	Exchanger sensor not allowed with stack connector setting	High
Lockout 242	Invalid DHW auto detect configuration	High
Lockout 244	PFEP Internal fault: Safety relay test invalid state	High
Lockout 245	Invalid Outlet connector type setting for T-rise	High
Lockout 246	4-20mA cannot be used for both modulation and setpoint control	High
Lockout 247	Invalid ILK bounce detection enable	High
Lockout 248	Invalid forced recycle interval	High
Lockout 249	STAT cannot be demand source when Remote Stat is enabled	High
Lockout 250	Invalid Fan speed error response	High
Lockout 251	Lead drop-stage on error setting does not match drop method configuration	High
Lockout 252	Invalid Line frequency setting	High
Lockout 253	Lead Lag modulation sensor not valid with setpoint source	High
Lockout 254	Lead Lag modulation sensor not valid with local setpoint source	High
Lockout 255	Lead Lag modulation sensor not valid with local modulation source	High
Lockout 256	Selected Controller interaction enable setting is not allowed	High
Lockout 257	Controller interaction enable does not match neighbor stack fault setting	High
Lockout 258	Controller ID must be non-zero if controller interaction is enabled	High
Lockout 259	Modulation output must be fan if controller interaction is enabled	High
Lockout 260	Asymmetrical paired (no flap) is set but flap switch input is energized	High
Lockout 261	Neighbor burner control blower fault detected	High
Lockout 262	Blower fault detected during flap test	High
Lockout 263	Invalid DHW demand temperature setting	High
Lockout 264	Invalid preferred outlet high limit setting	High
Lockout 265	Invalid preferred lightoff rate setting	High
Lockout 266	Invalid preferred stack limit rate setting	High

Troubleshooting the Tft250

Condensing/corrosion of conventional boiler All brands · Boiler
No heat or some zones cold All brands · Boiler
Noise All brands · Boiler
Poor heat / circulation All brands · Boiler
Relief valve weeps every cycle / pressure climbs All brands · Boiler
Short cycling / wasted fuel All brands · Boiler
Symptoms of air in system All brands · Boiler
Uneven heating All brands · Boiler
Won't fire All brands · Boiler
Blower not running NTI · Boiler
Blower not running NTI · Boiler
Blower runs at high speed with burner off NTI · Boiler
Blower runs at high speed with burner off NTI · Boiler
Boiler bangs or hisses; Lockout 81 delta T NTI · Boiler
Boiler bangs or hisses; Lockout 81 delta T NTI · Boiler
Burner not running on a call for heat NTI · Boiler
Burner not running on a call for heat NTI · Boiler
Checking spark and gas valve voltage during ignition NTI · Boiler
Checking spark and gas valve voltage during ignition NTI · Boiler
Circulator (CH or DHW) not running NTI · Boiler
Circulator (CH or DHW) not running NTI · Boiler
Clearing the low water cutoff lockout after filling NTI · Boiler
Clearing the low water cutoff lockout after filling NTI · Boiler
Combustion check procedure NTI · Boiler
Combustion check procedure NTI · Boiler
Display is blank NTI · Boiler
Display is blank NTI · Boiler
Display shows System Disconnected! constantly NTI · Boiler
Display shows System Disconnected! constantly NTI · Boiler
Dry run of the ignition sequence on new plastic vent NTI · Boiler
Dry run of the ignition sequence on new plastic vent NTI · Boiler
Flame failure check at commissioning NTI · Boiler
Flame failure check at commissioning NTI · Boiler
Ignition failure - Lockout 109 / Hold 110 NTI · Boiler
Ignition failure - Lockout 109 / Hold 110 NTI · Boiler
Lead-lag cascade setup shortcuts NTI · Boiler
Lockout 138 - flame too low NTI · Boiler
Lockout 138 - flame too low NTI · Boiler
Low water cutoff / ILK OFF lockout (67) NTI · Boiler
Low water cutoff / ILK OFF lockout (67) NTI · Boiler
Low water cutoff test NTI · Boiler
Low water cutoff test NTI · Boiler
No power - checking 120 VAC and 24 VAC at the boiler NTI · Boiler
No power - checking 120 VAC and 24 VAC at the boiler NTI · Boiler
Outdoor temperature alert (Alert 248) NTI · Boiler
Outdoor temperature alert (Alert 248) NTI · Boiler
Program module restore - login password NTI · Boiler
Reading the lockout and alert history NTI · Boiler
Reading the lockout and alert history NTI · Boiler
Running a pump by hand NTI · Boiler
Running a pump by hand NTI · Boiler
Stack limit lockout (Lockout 82) NTI · Boiler
Stack limit lockout (Lockout 82) NTI · Boiler
Turning the burner switch back on NTI · Boiler
Turning the burner switch back on NTI · Boiler

All NTI Boiler error codes →

Homeowner help: Boiler Not Heating: What to Check

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

NTI Tft250 error codes list

Troubleshooting the Tft250

Is Aurora Star Tech Your Trusted Boiler