Truma Water Heater: “E202H”
warning RV water heater fault codes
What it means
Combi cold-weather gas fault: the gas-pressure regulation system has iced up so gas cannot reach the burner at the correct pressure. Typically appears in freezing conditions and is part of the gas-supply fault family on the CP plus panel.
Most likely causes
- Regulator iced up in freezing temperatures most likely
- Moisture in the gas system freezing at the regulator common
- High butane content failing to vaporize in the cold less common
Safe checks you can do yourself
- Check whether outside temperatures are at or below freezing.
- Confirm the cylinder valve is open and the cylinder is not empty.
- Fit or use a Truma EisEx regulator heater for cold-weather operation if your setup supports it.
- Ensure you are running propane rather than a butane-heavy mix.
How to reset / clear E202H
- Warm/de-ice the regulator (e.g. with an EisEx heater) and restore gas flow.
- Switch the heater off and on at the CP plus panel to retry ignition.
When to call a technician
Icing is ruled out and the code persists, or the regulator appears damaged.
Applies to
Truma Combi 4 / Combi 6 · Truma Combi 4 E / Combi 6 E · CP plus control panel
FAQ
What does Truma Water Heater code "E202H" mean?
Combi cold-weather gas fault: the gas-pressure regulation system has iced up so gas cannot reach the burner at the correct pressure. Typically appears in freezing conditions and is part of the gas-supply fault family on the CP plus panel.
How do I reset Truma Water Heater E202H?
Warm/de-ice the regulator (e.g. with an EisEx heater) and restore gas flow. Switch the heater off and on at the CP plus panel to retry ignition.
What is the most common cause of E202H on a Truma Water Heater?
The most likely cause is regulator iced up in freezing temperatures.
Related · Truma water heater
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Gas-supply / combustion fault group on the Combi: the burner… W17H
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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
- Truma CP plus Operating Instructions — Troubleshooting guide for Combi gas heater (H) — CP plus operating instructions p.17, fault code E202H (Truma (OEM-hosted, Imperial Outdoors))
Note: In the official chart E202H shares its cause/remedy block with the other gas-supply codes; 'iced-up regulator' is the specific labeled cause associated with this subcode.
● Last verified 2026-06-29 · compiled from manufacturer documentation. Codes can vary by model year — always cross-check your unit’s manual.