Frigidaire Air Conditioner Error Codes

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

CodeDescription

ASAmbient thermistor sensor located in front of the evaporator has failed.CSCondenser thermostat sensor has failed (heat pump models only); displays for 1…ESEvaporator thermistor sensor has failed.F1Indoor ambient temperature sensor is open or short-circuited.F2Indoor evaporator temperature sensor is open or short-circuited.F4Outdoor ambient temperature sensor is open or short-circuited.FPLow temperature prevention protection activated; unit enters pure electric…HSHeat thermistor sensor has failed (heat capable models only).OSOutdoor ambient thermostat sensor has failed (heat pump models only); displays…

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M+ Max·Frigidaire Air Conditioner

AS on my Frigidaire Air Conditioner

M+

Ambient thermistor sensor located in front of

From Service Manual 771177, p.29:

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

2.Disconnect the sensor and measure resistance at the sensor body. Expected: 10 kΩ to 12 kΩ at 77°F (25°C).

3.Check the sensor harness for opens and shorts. Back-probe the sensor pins at the control board connector; a reading outside 5 kΩ to 50 kΩ indicates a failed sensor.

Part 5304513033

Thermistor

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