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A Dethleffs that provides hot water on gas but not on 230V usually has a faulty heating element or a blown fuse.
A Dethleffs that provides hot water on gas but not on 230V usually has a faulty heating element or a blown fuse. If the boiler does not produce hot water on any energy source, this often points to a locked safety valve or an empty gas bottle combined with a tripped 230V fuse. First check that the boiler is on, the gas bottle is open, and the fuses are intact.
In a Dethleffs with a Truma Combi or Alde system, the problem is usually with the power supply or a safety device, not the boiler itself. A cold morning without hot water is annoying, but the solution is often simpler than you think.
Dethleffs has been building reliable campers for years, but even there the hot water supply can occasionally falter. Depending on the year and model, it is equipped with a Truma Combi (a combination of heating and boiler), an Alde system (in the higher segments), or a separate Truma boiler. Each system has its own typical quirks, but the symptoms are similar: the tap stays cold, or the water only gets lukewarm.
The most common causes are:
For more background on this issue, see our general explanation about a camper boiler without hot water.
First try on gas, then on 230V. If it works on gas but not on electricity, the heating element or thermostat is often faulty. If it works on electricity but not on gas, check the gas pressure, ignition, or gas valve. If neither works, the safety valve or circuit board is likely the culprit.
Costs vary widely: a new heating element costs roughly between 80 and 200 euros, a circuit board quickly 300 to 600 euros, and a complete new Truma Combi can go towards 2,000 euros, excluding installation. Always have a diagnosis done first before ordering parts.
If the repair becomes too expensive or you are tired of the hassle, there is an honest way out: sell your Dethleffs to a buyer who also takes over campers with a faulty boiler. This way you avoid expensive repairs and quickly get clarity on the market value of your motorhome.
Frequently asked questions
Have the value of your Dethleffs calculated free and without obligation, even with a faulty boiler. We will take it over as is, without repair costs for you.
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