Truma Water Heater: “E1”
warning RV water heater fault codes
What it means
No flame detected. The AquaGo attempted to ignite the gas burner three times and could not establish a stable flame, so it has locked out.
Most likely causes
- Propane tank empty or service valve closed most likely
- Air in the gas line after a tank change common
- Low gas pressure or a faulty/closed regulator common
- Faulty igniter or gas valve less common
Safe checks you can do yourself
- Confirm the propane tank has fuel and the service valve is fully open
- Verify other gas appliances (stove) light, to confirm gas is flowing
- After a tank swap, briefly run a gas stove burner to purge air from the line
- Check the regulator is set correctly and not in a bypass/closed state
How to reset / clear E1
- Resolve the gas supply issue first
- Switch the AquaGo off at the control panel, wait a few seconds, then switch it back on to restart the ignition sequence
When to call a technician
The code returns after confirming good gas supply, or if you suspect a gas leak, faulty igniter, or gas valve.
Applies to
Truma AquaGo basic · Truma AquaGo comfort · Truma AquaGo comfort plus
FAQ
What does Truma Water Heater code "E1" mean?
No flame detected. The AquaGo attempted to ignite the gas burner three times and could not establish a stable flame, so it has locked out.
How do I reset Truma Water Heater E1?
Resolve the gas supply issue first Switch the AquaGo off at the control panel, wait a few seconds, then switch it back on to restart the ignition sequence
What is the most common cause of E1 on a Truma Water Heater?
The most likely cause is propane tank empty or service valve closed.
Related · Truma water heater
Combi cold-weather gas fault: the gas-pressure regulation sy… E211H / E212H
Gas-supply / combustion fault group on the Combi: the burner… W17H
Hot-water mode was selected while the water heater (boiler) … W21H
Room-temperature sensor warning on the Combi: the CP plus ha… W27
Water circulation pump running dry. The internal circulation… W29
Excessive heat demand. The unit is running at full capacity …
Sources
- Tech Tip: Truma AquaGo Error Codes — Truma US official tech tip, code E1 'No Flame Detected' (Truma (manufacturer))
- Truma AquaGo basic Operating Instructions — Appendix A Error Codes — Operating Instructions Appendix A, Error Codes table (Truma / ManualsLib)
Note: On analog panels the fault shows as a red LED blink pattern (long/short blinks) on the unit itself; on the CP plus digital panel it appears as an alphanumeric code. Exact code label may appear as 'E 1' in some manuals.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.