RecPro RV air conditioner fault codes

RV roof air conditioners and their thermostats show codes for communication faults, sensor failures, or freeze protection.

How to read the code

Codes usually appear on the wall thermostat. Note whether the code clears when you cycle power, which often points to a communication issue.

Models covered: every code below applies to the RecPro A3501 / A3800 / T3500, RP-AC3501, RP-AC3800.

All documented codes

E4 warning
The system detects that it is running but not producing the expected cooling effect.… E8 warning
The outdoor ambient temperature sensor is reading out of range or has failed.… E9 warning
The room temperature sensor located in the wall pad (wall controller) is reading out of ra…

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