NTI Error Code Hold / Lockout 67: ILK off – interlock string open (Boiler)
NTI error code Hold / Lockout 67 on a boiler means: ILK off - interlock string open. It is also called NTI diagnostic code Hold / Lockout 67.
Homeowner? What NTI code Hold / Lockout 67 means for you
Stop and call Your boiler is reporting: ILK off - interlock string open. This code is a safety shutdown. Turn the boiler off and call a licensed technician. Do not keep resetting it. If you smell gas, leave the house and call your gas utility or 911 from outside.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does NTI error code Hold / Lockout 67 mean?
The interlock chain that must be closed before the burner can run is open. On this boiler the string includes the built-in low water cutoff and any external limit wired to LIM. Display typically reads Lockout 67 ILK OFF.
Applies to: Trinity Tft60, Tft85, Tft110, Tft154, Tft201, Tft285, Tft340, Tft399
Common causes of NTI code Hold / Lockout 67
- Low water condition (internal low water cutoff open)
- External limit wired to LIM is open
- Condensate blockage switch opened (water backing up or exhaust restricted)
NTI models that use code Hold / Lockout 67
Tft60Tft60Tft85Tft85Tft110Tft110Tft154Tft155Tft175Tft200Tft201Tft250Tft285Tft300Tft340Tft399Tft399
Other NTI Boiler codes
NTI code Hold / Lockout 67: homeowner questions
What does NTI code Hold / Lockout 67 mean?
ILK off - interlock string open. The interlock chain that must be closed before the burner can run is open. On this boiler the string includes the built-in low water cutoff and any external limit wired to LIM. Display typically reads Lockout 67 ILK OFF.
Is it safe to keep using my boiler with code Hold / Lockout 67?
No. Code Hold / Lockout 67 is a safety shutdown, so keep the boiler off until a licensed technician has checked it.
Can I reset NTI code Hold / Lockout 67 myself?
Do not keep resetting it. Repeated resets can hide a safety problem; a licensed technician needs to find the cause.
Who can fix NTI code Hold / Lockout 67 near me?
Aurora Star Tech Inc. repairs NTI boilers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Boiler Not Heating: What to Check
Troubleshooting guides
- 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
Source: NTI Trinity Tft399 Installation and Operation Manual (2018-09-07), Sec. 16.0 Troubleshooting, Table 16-3. Written in our own words as a summary; always check the original manual.
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.