KeepRite Error Code Amber LED off: Standby – no call (2-wire hookup or indoor unit unpowered) (AC)

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

KeepRite error code Amber LED off on a air conditioner means: Standby - no call (2-wire hookup or indoor unit unpowered). It is also called KeepRite diagnostic code Amber LED off.

Low severityAir ConditionerKeepRite C4A3/CXA6 AC · KeepRite *SA/*SH Single-Stage Communicating

Homeowner? What KeepRite code Amber LED off means for you

Usually minor Your air conditioner is reporting: Standby - no call (2-wire hookup or indoor unit unpowered). 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 LED off mean?

The amber status LED is dark. With only two thermostat wires (C and Y, with an R-Y jumper) the board loses power whenever there is no cooling call, so no flash codes can be shown. It also looks like this if the indoor unit has no power. Normally nothing is wrong.

Applies to: C4A3/CXA6 A-C; *SA/*SH single-stage communicating board

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 LED off

*SA5 *SA6 C4A3 CXA6

Other KeepRite AC codes

Code	Meaning
83	Low pressure lockout
84	High pressure lockout
Amber 1 flash	Running - cooling / low stage (normal)
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 on solid	Standby - no call (communicating)
Brown-out defeat toggle	Turn 230 V brown-out protection off or on
Green COMM LED off	No communication yet
Green COMM LED on	Communication with the system established
Green POWER LED	Comfort Alert module has power
Red TRIP LED	Comfort Alert TRIP - Y call but compressor not running

All KeepRite Air Conditioner error codes →

KeepRite code Amber LED off: homeowner questions

What does KeepRite code Amber LED off mean?

Standby - no call (2-wire hookup or indoor unit unpowered). The amber status LED is dark. With only two thermostat wires (C and Y, with an R-Y jumper) the board loses power whenever there is no cooling call, so no flash codes can be shown. It also looks like this if the indoor unit has no power.…

Is it safe to keep using my air conditioner with code Amber LED off?

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

Can I reset KeepRite code Amber LED off myself?

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

Who can fix KeepRite code Amber LED off 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

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Checking OAT and OCT thermistors - KeepRite C4A3/CXA6 KeepRite · Air Conditioner
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Source: KeepRite ICP C4A3/H4A3/T4A3/CXA6 A-C Installation Instructions 421 01 5103 05, Table 1 Status Codes, p.17-18 and 2-wire hookup, p.16; split service manual Table 13 p.46-47. 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.