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 models.

  2. 212 HVAC assumes no responsibility for any accidents or troubles caused in the disassembly or repair of equipment performed according to 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 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 flashing, 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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