American Standard A/C Error Codes

American Standard Error Code What this means
Green light on, slow flashing, or fast flashing Unit is operating normally
Amber light on Unit requires refrigerant
Red 1 flash Communication error
Red 2, 3, and 4 flashes Defrost fault
Red 5 flashes Fault with the ambient temperature sensor
Red 6 flashes Fault with the coil temperature sensor
Red 7 flashes Low-pressure problem
Red 13 flashes Fault with the external temperature sensor
Red 17 flashes High-pressure problem