Truma Electric Boiler
(230V)
The Truma Boiler Elektro is an electric hot water generator designed for caravans and motorhomes, using a 230 V, 850 W electric heating element. It automatically limits water temperature to approx. 70 °C and includes built-in overtemperature protection and a safety/drain valve.
View official manual on manufacturer's site ↗Technical Specifications
Master Troubleshooting & Diagnostics Matrix
| Error Code / Indicator | Symptom / Meaning | Possible Cause | Step-by-Step DIY Fix | Suggested Actions |
|---|---|---|---|---|
Water not getting hot | No operating voltage or operation without water causing the overtemperature protection to switch off the heating element. | — | Restore power, or switch off, wait 10 minutes, refill with water, then switch back on. | DIY Safe |
Extremely long heating time | The water container is furred with limescale. | — | Descale the water system. | DIY Safe |
Water's running away - the boiler won't fill | The safety/drain valve is open. | — | Close the safety/drain valve. | DIY Safe |
The boiler won't drain even with the safety/drain valve open | Drainage socket closed, venting hose closed off, or elbow fitting twisted at the boiler. | — | Check the opening for dirt (slush, ice, leaves), check the hose isn't kinked, and confirm the elbow fitting's aeration valve faces sideways. | DIY Safe |
Water dripping out of drainage socket of safety/drain valve | Water pressure is too high. | — | Check the pump pressure doesn't exceed 2.8 bar, fitting a pressure reducer if it's on mains water. | DIY Safe |
Water drips from the drain port of the safety/drain valve | Water pressure is too high. | — | Check the pump pressure stays under 2.8 bar - fit a pressure reducer if it's connected to mains water, to keep pressure below that. | DIY Safe |
Water does not heat up | No operating voltage or lack of water operation causes the thermal protection system to cut off the heating element power. | — | Restore power supply; if caused by lack of water operation, disconnect power, wait 10 minutes, fill with water, and then reconnect power. | DIY Safe |
Water heating takes too long | The water tank is scaled up. | — | Descale the water system (see maintenance). | DIY Safe |
Water loss - water heater cannot be filled | Safety/drain valve is open. | — | Close the safety/drain valve. | DIY Safe |
Frequently Asked Questions
Q: What should I do if there is a risk of frost?
Fully drain the boiler by opening the safety/drain valve (lever upright - position b) and every hot tap, and cut power to the water pump.
Q: Can the water temperature be preselected?
No - the water temperature can't be preselected; it's automatically capped at around 70°C.
Q: What pressure reducer is needed when connecting to a central water supply?
A pressure reducer needs to be fitted to stop the boiler seeing pressures above 2.8 bar.
Q: What needs to be noted before initial use?
Before first use, make sure the whole water system is fully filled. When not in use, drain the water heater to guard against frost damage.
Q: Can the water temperature be pre-set?
No, the water temperature cannot be pre-set; the automatic temperature limit is approximately 70 °C.
Q: If the over-temperature safety system is triggered and cuts off the power, how to reset it?
You must wait until the device temperature drops below 24 °C, then switch the switch back to "Off" and then to "On" to reset.