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American Standard A/C Error Codes

American Standard Error CodeWhat this means
Green light on, slow flashing, or fast flashingUnit is operating normally
Amber light onUnit requires refrigerant
Red 1 flashCommunication error
Red 2, 3, and 4 flashesDefrost fault
Red 5 flashesFault with the ambient temperature sensor
Red 6 flashesFault with the coil temperature sensor
Red 7 flashesLow-pressure problem
Red 13 flashesFault with the external temperature sensor
Red 17 flashesHigh-pressure problem