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.
Accuracy notes
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.
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 system has… E211H / E212H
Gas-supply / combustion fault group on the Combi: the burner could not… W17H
Hot-water mode was selected while the water heater (boiler) is empty.… W21H
Room-temperature sensor warning on the Combi: the CP plus has detected… W27
Water circulation pump running dry. The internal circulation pump is not… W29
Excessive heat demand. The unit is running at full capacity but cannot…
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)
● Checked against 2 manufacturer documents · Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual. How we verify