Truma Ultrastore Water Heater
Official technical documentation and workshop diagnostics for Storage Water Heater.
View official manual on manufacturer's site ↗Technical Specifications
TypeLiquid gas (LPG) operated storage water heater with an additional 230V electric heating element
Max Water Pressure2.8 bar (use a pressure reducer when connected to a central/mains water supply)
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|
N/A | When switching on, the heater does not operate (gas operation) Possible Cause: No 12V supply, or a window above the cowl is open. | Check the power supply (operating voltage minimum 10.5V). Check the water heater fuse. Close any windows above the cowl. | DIY Safe |
N/A | When switching on, the heater does not operate and the red lamp lights up (gas operation) Possible Cause: Cowl cover fitted, air in the gas supply, no gas supply, or incorrect gas pressure. | Remove the cowl cover and/or clear any obstruction. Check gas valves and the gas bottle. To unlock (and purge air), switch off the appliance, wait 5 minutes, and switch on again. | DIY Safe |
N/A | Heater operates for a prolonged time and then the red lamp lights up (gas operation) Possible Cause: Over-temperature thermostat has operated. | Check water content and refill if required (close the drain valve first). To unlock, switch off the appliance, wait 5 minutes, and switch on again. | DIY Safe |
N/A | When switching on, the heater does not operate (electrical operation) Possible Cause: No 230V supply voltage, or the over-temperature thermostat has operated. | Connect the vehicle to the site supply and/or check the residual current circuit breaker. Check water content and refill if required (close the drain valve first). The electrical heating element has an excess-temperature cut-out - in the event of a fault, switch off at the control panel, wait 5 minutes, then switch on again. | DIY Safe |
N/A | Water drips from the safety/drain valve Possible Cause: Water pressure too high. | Check water pressure (max. 2.8 bar) - use a pressure reducer when connected to a central water supply. | DIY Safe |
N/A | When opening the cold water tap, hot water comes out Possible Cause: Hot water flows back through the cold water supply. | Fit a non-return valve in the cold water supply (refer to installation instructions). If the fault persists, contact Truma Service. | DIY Check / Tech Fallback |