Houghton Air Conditioner: “E1”
warning RV air conditioner error codes
What it means
The room-air temperature sensor is reading as out of range, shorted, or open, so the unit cannot measure cabin temperature.
Most likely causes
- Disconnected or damaged room temperature sensor wiring most likely
- Failed (drifted/shorted/open) room temperature sensor common
- Control board input fault less common
Safe checks you can do yourself
- With power off, inspect the room sensor connector for corrosion or a loose pin.
- Confirm the sensor has not been dislodged from its mounting position.
How to reset / clear E1
- Turn the unit off and remove power at the breaker for about a minute.
- Restore power; if the sensor connection is good the code should clear.
When to call a technician
If reseating the connector does not clear the code, the temperature sensor or control board likely needs replacement by a technician.
Applies to
Houghton Belaire 3400 · Houghton Belaire 3500 · Houghton Belaire 3800 · Houghton Belaire series rooftop AC
FAQ
What does Houghton Air Conditioner code "E1" mean?
The room-air temperature sensor is reading as out of range, shorted, or open, so the unit cannot measure cabin temperature.
How do I reset Houghton Air Conditioner E1?
Turn the unit off and remove power at the breaker for about a minute. Restore power; if the sensor connection is good the code should clear.
What is the most common cause of E1 on a Houghton Air Conditioner?
The most likely cause is disconnected or damaged room temperature sensor wiring.
Related · Houghton air conditioner
The wall thermostat (wall pad) and the rooftop unit have los… E5
The outdoor (condenser) coil temperature is reading too high…
Sources
- Houghton Air Conditioner Problems, Reviews, Manual, Errors — Houghton Belaire error code table (manual p.27) (The Camping Advisor)
- RP-AC3501 / RP-AC3800 Ducted AC Owner's Manual — Room temperature sensor fault E1 (RecPro)
Note: On some Houghton units the primary room sensor sits at the wall pad (see E9); E1 refers to the room-temperature sensor circuit.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.