RecPro Air Conditioner: “E9”
warning RV air conditioner error codes
What it means
The room temperature sensor located in the wall pad (wall controller) is reading out of range or has failed.
Most likely causes
- Failed wall-pad room temperature sensor most likely
- Damaged wall-pad communication/sensor wiring common
- Wall pad controller fault less common
Safe checks you can do yourself
- Confirm the wall pad is mounted away from direct heat/sun sources that could skew readings.
- With power off, check the wall pad cable connection.
How to reset / clear E9
- Turn the unit off and remove power at the breaker for about a minute.
- Restore power; if the wall pad connection is good the code should clear.
When to call a technician
If the wiring is intact and E9 persists, the wall pad sensor/controller likely needs replacement by a technician.
Applies to
RecPro RP-AC3501 · RecPro RP-AC3800 · RecPro A3501 / A3800 / T3500 (ducted)
FAQ
What does RecPro Air Conditioner code "E9" mean?
The room temperature sensor located in the wall pad (wall controller) is reading out of range or has failed.
How do I reset RecPro Air Conditioner E9?
Turn the unit off and remove power at the breaker for about a minute. Restore power; if the wall pad connection is good the code should clear.
What is the most common cause of E9 on a RecPro Air Conditioner?
The most likely cause is failed wall-pad room temperature sensor.
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Sources
- RP-AC3501 / RP-AC3800 Ducted Air-Conditioning System Owner's Manual — Wall pad room temperature sensor fault E9 (RecPro)
Note: E9 specifically refers to the sensor inside the wall pad, distinct from the E1 room sensor circuit.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.