KeepRite Error Codes & Diagnostic Codes

Updated October 13, 2026 · by Aurora Star Tech Inc.

KeepRite error codes and diagnostic codes: look up a code to see what it means, the likely causes and the steps to fix it.

KeepRite error codes by equipment type

KeepRite Air Conditioner error codes

Code	Meaning
1	Comfort Alert 1 - long run time
2	Comfort Alert 2 - system pressure trip
3	Comfort Alert 3 - short cycling
4	Comfort Alert 4 - locked rotor
5	Comfort Alert 5 - open circuit
6	Comfort Alert 6 - open start circuit
7	Comfort Alert 7 - open run circuit
9	Comfort Alert 9 - low control voltage
16	Lost communication with wall control
25	Model plug missing or invalid
31	High pressure switch open
32	Low pressure switch open
45	Outdoor control board failure
46	Brown-out (low voltage)
47	No 230 V at the unit
53	Outdoor air temperature sensor fault
55	Outdoor coil sensor fault
56	Air and coil sensors disagree
71	Low stage thermal cutout
72	Compressor thermal cutout (two-stage: high stage)
73	Contactor stuck closed
74	No 230 V at compressor
81	Low stage thermal lockout
82	Thermal lockout (two-stage: high stage)
83	Low pressure lockout
84	High pressure lockout
Red TRIP LED	Comfort Alert TRIP - Y call but compressor not running
TRIP + ALERT flashing together	Comfort Alert - control voltage too low to operate

KeepRite Furnace error codes

Code	Meaning
1+2	Blower running after power-up (normal)
2	Pressure switch stuck closed (did not open)
3	Pressure switch did not close or reopened
4	Limit or rollout circuit open
5	Flame sensed with gas valve off
6	Flame not proved during ignition trial
6+1	Ignition lockout after 4 failed tries
7	Limit circuit lockout
8	Gas heating lockout - manual reset needed
9	High-heat pressure switch or relay did not close or reopened
10	Line voltage polarity reversed
LED off	Status LED dark - no power to the control or blown 3 A fuse
LED steady ON	Status LED on solid - control lockout (resets after 1 hour)

KeepRite Heat Pump error codes

Code	Meaning
16	Lost communication with wall control
25	Model plug missing or invalid
31	High pressure switch open
32	Low pressure switch open
45	Outdoor control board failure
46	Brown-out (low voltage)
47	No 230 V at the unit
53	Outdoor air temperature sensor fault
55	Outdoor coil sensor fault
56	Air and coil sensors disagree
71	Low stage thermal cutout
72	Compressor thermal cutout (two-stage: high stage)
73	Contactor stuck closed
74	No 230 V at compressor
81	Low stage thermal lockout
82	Thermal lockout (two-stage: high stage)
83	Low pressure lockout
84	High pressure lockout
Phase monitor LED flashing	3-phase monitor - phase reversal

Find codes by KeepRite model

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.

KeepRite error codes by equipment type

KeepRite Air Conditioner error codes

KeepRite Furnace error codes

KeepRite Heat Pump error codes

Find codes by KeepRite model

KeepRite *CA/*CH Two-Stage Communicating

KeepRite *SA/*SH Single-Stage Communicating

KeepRite C4A3/CXA6 AC

KeepRite (F/G)9MXE Single-Stage Furnace

KeepRite (F/G)9MXT Two-Stage Furnace

KeepRite (F/G)96VTN Two-Stage Variable-Speed Furnace

KeepRite N4H4/R4H4/WCH4/NXH5 Heat Pump

Experience an Energy-Efficient Thermostat in Ajax Today

KeepRite CA/CH Two-Stage Communicating

KeepRite SA/SH Single-Stage Communicating