Truma Air Conditioner: “Red LED (steady)”
warning RV air conditioner error codes
What it means
A permanently illuminated red LED (LED 3) on the IR receiver indicates a general fault with the air conditioner.
Most likely causes
- Power supply or control fault detected by the unit common
- Internal protection triggered (e.g. temperature/pressure) common
- Electronic/control board fault less common
Safe checks you can do yourself
- Confirm a stable 230V supply and that breakers/fuses are intact
- Switch the unit off, wait a short time, then switch it on again
- Make sure intake/outlet airflow is not blocked and filters are clean
How to reset / clear Red LED (steady)
- Switch the unit off, wait a short time, and switch it back on
- If the red LED stays lit after restarting, the fault persists and service is required
When to call a technician
If the red LED continues to illuminate after switching off and on again, contact Truma Service.
Applies to
Truma Aventa comfort · Truma Aventa eco
FAQ
What does Truma Air Conditioner code "Red LED (steady)" mean?
A permanently illuminated red LED (LED 3) on the IR receiver indicates a general fault with the air conditioner.
How do I reset Truma Air Conditioner Red LED (steady)?
Switch the unit off, wait a short time, and switch it back on If the red LED stays lit after restarting, the fault persists and service is required
What is the most common cause of Red LED (steady) on a Truma Air Conditioner?
The most likely cause is power supply or control fault detected by the unit.
Related · Truma air conditioner
Sources
- Truma Aventa comfort Operation and Installation Instructions — IR receiver / operating indicator (Red LED illuminates) — Section: IR receiver / operating indicator, 'LED 3 red – permanently on – (fault)' (Truma / ManualsLib)
Note: The manual describes this as a general fault indicator without a specific numeric code; the remedy is switch off/on and, if it persists, contact Truma Service.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.