Advent Air 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.

All documented codes

E4 warning
On the Advent ACTH12 thermostat, E4 indicates a communication error between the thermostat… E5 warning
On the Advent ACTH12 thermostat, E5 indicates a DC supply-voltage problem — the system vol…

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