KeepRite Error Code Amber 1 flash: Running – cooling / low stage (normal) (AC)

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

KeepRite error code Amber 1 flash on a air conditioner means: Running - cooling / low stage (normal). It is also called KeepRite diagnostic code Amber 1 flash.

Low severityAir ConditionerAlso Heat PumpKeepRite C4A3/CXA6 AC · KeepRite *SA/*SH Single-Stage Communicating · KeepRite *CA/*CH Two-Stage Communicating

Homeowner? What KeepRite code Amber 1 flash means for you

Usually minor Your air conditioner is reporting: Running - cooling / low stage (normal). This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

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.
Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
Keep about 2 feet around the outdoor unit clear of leaves, grass and debris.
If you see ice on the pipes or the indoor coil, turn the system off and run only the fan for a few hours, then call a technician.
Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.

Call (647) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does KeepRite error code Amber 1 flash mean?

One flash, then a pause, repeated. The outdoor board is running a call and nothing is wrong. Table 13 lists it as cooling operation on single-stage boards; on the two-stage boards it means low-stage cooling or heating.

Applies to: C4A3/CXA6 A-C; *SA/*SH and *CA/*CH communicating outdoor boards

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

KeepRite models that use code Amber 1 flash

*CA624 *CA636 *CA648 *CA660 *CA924 *CA936 *CA948 *CA960 *SA5 *SA6 C4A3 CXA6

Other KeepRite AC codes

Code	Meaning
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
Amber 2 flashes	High stage running (normal)
Amber 5 flashes	Brown-out protection turned off (user setting)
Amber 6 flashes	Brown-out protection active (user setting)
Amber LED off	Standby - no call (2-wire hookup or indoor unit unpowered)
Amber LED on solid	Standby - no call (communicating)
Brown-out defeat toggle	Turn 230 V brown-out protection off or on

All KeepRite Air Conditioner error codes →

KeepRite code Amber 1 flash: homeowner questions

What does KeepRite code Amber 1 flash mean?

Running - cooling / low stage (normal). One flash, then a pause, repeated. The outdoor board is running a call and nothing is wrong. Table 13 lists it as cooling operation on single-stage boards; on the two-stage boards it means low-stage cooling or heating.

Is it safe to keep using my air conditioner with code Amber 1 flash?

Usually yes. Code Amber 1 flash is normally minor, but if it keeps coming back have it checked.

Can I reset KeepRite code Amber 1 flash myself?

You can try one reset (power off for 30 seconds, then on). If KeepRite code Amber 1 flash comes back, the cause is still there and a licensed technician should check it.

Who can fix KeepRite code Amber 1 flash near me?

Aurora Star Tech Inc. repairs KeepRite air conditioners in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.

Homeowner help: AC Running But Not Cooling: What to Check

Troubleshooting guides

Bubbles in sight glass / temperature drop across liquid line drier All brands · Air Conditioner
Coil iced, airflow blocked, poor cooling, high box temp All brands · Air Conditioner
Continuous run, no cooling, condenser cooler than normal All brands · Air Conditioner
Evaporator freezing All brands · Air Conditioner
Freezing in cold weather All brands · Air Conditioner
General service-call symptom list All brands · Air Conditioner
Hard starting / stalls on restart All brands · Air Conditioner
Humid indoor air All brands · Air Conditioner
Insufficient cooling, frost at outlet of liquid-line filter-drier, both pressures and amps dropping All brands · Air Conditioner
Lack of cooling, very high head, high amps, high suction All brands · Air Conditioner
Liquid floods back to compressor on start / liquid refrigerant in cold condenser All brands · Air Conditioner
Low head pressure persists in winter, or loss of capacity in summer All brands · Air Conditioner
Low head pressure, starved evaporator, high superheat and high subcooling readings, short cycling, poor cooling in winter All brands · Air Conditioner
Low head, low suction, poor cooling together All brands · Air Conditioner
Low suction + high superheat (starved evaporator) All brands · Air Conditioner
Measurable pressure drop across suction filter-drier; oil return problems, low suction, loss of capacity All brands · Air Conditioner
Needs refrigerant (symptoms) All brands · Air Conditioner
No cooling All brands · Air Conditioner
No cooling via stat All brands · Air Conditioner
No cooling, compressor and condenser fan both dead, supply voltage present at disconnect All brands · Air Conditioner
No cooling, compressor runs, condenser fan off, very high head, compressor cycling on overload All brands · Air Conditioner
No cooling, system running, house 81°F at 72°F set, high temp split, low suction, ice on coil All brands · Air Conditioner
Noisy All brands · Air Conditioner
Not cooling All brands · Air Conditioner
Outdoor unit won't start, 24 V present at contactor coil All brands · Air Conditioner
Overcharged system All brands · Air Conditioner
Poor cooling All brands · Air Conditioner
Poor cooling with liquid level normal All brands · Air Conditioner
Poor cooling, low suction, high superheat, warm evaporator All brands · Air Conditioner
Poor performance All brands · Air Conditioner
Runs briefly then shuts down, very high head All brands · Air Conditioner
Rust on accumulator / vibration absorber leaks All brands · Air Conditioner
Starved evaporator (partial frost, poor cooling) All brands · Air Conditioner
Superheat above target All brands · Air Conditioner
Superheat below target All brands · Air Conditioner
System short cycles All brands · Air Conditioner
Thermostat suspected All brands · Air Conditioner
Undercharged system: compressor runs continuously, poor cooling, high power use, warm liquid line and drier All brands · Air Conditioner
Water dripping inside All brands · Air Conditioner
Won't engage All brands · Air Conditioner
Won't start / no cooling All brands · Air Conditioner
Checking OAT and OCT thermistors - KeepRite C4A3/CXA6 KeepRite · Air Conditioner
Turn 230 V brown-out protection off or on KeepRite · Air Conditioner

Source: KeepRite ICP C4A3/H4A3/T4A3/CXA6 A-C Installation Instructions 421 01 5103 05, Table 1 Status Codes, p.17-18; split service manual Table 13 p.46-47 and Table 17 p.59-60. 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.