American Standard Error Code Search

Error code search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code.


  1. This page provides a simple explanation concerning content relating to error codes and their possible causes. Please note that the content may slightly differ depending on the model.

2. It is always advised that you consult with an HVAC repair professional before attempting to provide any repairs yourself.

3. Precision Air assumes no responsibility for any accidents or troubles caused in the disassembly or repair of equipment performed according to the information on this page.


If molded case circuit breakers or earth leakage circuit breakers have tripped, do not reset the breaker immediately without first checking for any problems with the insulation of equipment.

Resetting breakers without a check of insulation may cause damage to equipment.

American Standard Air Conditioning Codes:


CODE: Green light on, slow or fast flashing
RESULT: Unit is operating normally.

CODE: Amber light on
RESULT: Unit requires refrigerant.

CODE: Red 1 flash
RESULT: Communication error.

CODE: Red 2, 3, and 4 flashes
RESULT: Defrost fault.

CODE: Red 5 flashes
RESULT: Fault with the ambient temperature sensor.

CODE: Red 6 flashes
RESULT: Fault with the coil temperature sensor.

CODE: Red 7 flashes
RESULT: Low-pressure problem.

CODE: Red 13 flashes
RESULT: Fault with the external temperature sensor.

CODE: Red 17 flashes
RESULT: High-pressure problem.

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