American Standard Air Conditioner Error Codes

9 error codes for American Standard air conditioner models. Each links to the full diagnostic procedure from the service manual.

CodeDescription

1Normal operation (LED continuously ON).2No power to the board or the control board has failed.3Compressor failure detected.4Blown fuse detected.5Mode switch or setpoint switch fault, or incorrect thermostat wiring.6Indoor air thermistor fault.7Indoor coil thermistor fault.8Outdoor air thermistor fault (PTHP models only).9Outdoor coil thermistor fault (PTHP models only).

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts
Verified part numbers when replacement is required

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M+ Max·American Standard Air Conditioner

1 on my American Standard Air Conditioner

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Normal operation (LED continuously ON)

From Service Manual 413527, p.19:

1.Access service mode to confirm the active fault code and read stored error history.

2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.

3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.

Part WPW10804018

Electronic control board

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