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KeepRite Air Conditioner Error Codes

Updated · by Aurora Star Tech Inc.

28 KeepRite Air Conditioner error codes and diagnostic codes, with causes and troubleshooting steps for each. Select a code, or find your model below.

Homeowner with a air conditioner problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

KeepRite Air Conditioner error codes list

CodeMeaningSeverity
1Comfort Alert 1 - long run timeMedium
2Comfort Alert 2 - system pressure tripHigh
3Comfort Alert 3 - short cyclingMedium
4Comfort Alert 4 - locked rotorHigh
5Comfort Alert 5 - open circuitHigh
6Comfort Alert 6 - open start circuitHigh
7Comfort Alert 7 - open run circuitHigh
9Comfort Alert 9 - low control voltageMedium
16Lost communication with wall controlMedium
25Model plug missing or invalidHigh
31High pressure switch openHigh
32Low pressure switch openHigh
45Outdoor control board failureHigh
46Brown-out (low voltage)Medium
47No 230 V at the unitHigh
53Outdoor air temperature sensor faultMedium
55Outdoor coil sensor faultMedium
56Air and coil sensors disagreeMedium
71Low stage thermal cutoutHigh
72Compressor thermal cutout (two-stage: high stage)High
73Contactor stuck closedHigh
74No 230 V at compressorHigh
81Low stage thermal lockoutHigh
82Thermal lockout (two-stage: high stage)High
83Low pressure lockoutHigh
84High pressure lockoutHigh
Red TRIP LEDComfort Alert TRIP - Y call but compressor not runningHigh
TRIP + ALERT flashing togetherComfort Alert - control voltage too low to operateMedium

Find codes by KeepRite model

KeepRite *CA/*CH Two-Stage Communicating

*CA624*CA636*CA648*CA660*CA924*CA936*CA948*CA960

KeepRite *SA/*SH Single-Stage Communicating

*SA5*SA6

KeepRite C4A3/CXA6 AC

C4A3CXA6

Air Conditioner troubleshooting guides

KeepRite Air Conditioner specs and setup data

Homeowner help: AC Running But Not Cooling: 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.

© 2026 Aurora Star Tech Inc. All rights reserved. This page may not be copied, republished or used to train other systems without written permission.

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