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A Hymer that cools on gas but not on 230V usually has a faulty heating element or a loose plug on the boiler.
A Hymer that cools on gas but not on 230V usually has a faulty heating element or a loose plug on the boiler. With a completely silent Truma Combi, the cause is often an empty gas bottle, a blown fuse, or a circuit board that no longer passes on voltage. So first check the 12V supply, the fuses and the gas supply before replacing expensive parts.
The exact cause depends on the type of heating (Truma Combi on gas/diesel or Alde water heating) and the specific symptoms, such as error codes or a burner that won't ignite. A thorough diagnosis prevents you from replacing parts unnecessarily.
Hymer typically installs two types of heating systems: the Truma Combi (gas or diesel) in most models, and the Alde water heating in the more expensive or larger motorhomes. Each system has its own typical faults.
If a Truma Combi fails to start or cuts out, first check the supply voltage (minimum 10.5 V) and the fuses. For gas models, an empty or frozen gas bottle is a classic issue; for diesel models, the fuel pump may have drawn in air or the filter may be blocked. A common cause is also a dirty burner or combustion chamber, especially after a long period of inactivity. The circuit board can become faulty due to moisture or voltage spikes. A typical error code is E517H (no flame signal), which points to a gas or ignition problem.
In Alde systems, heated water circulates through radiators. If everything stays cold, check the circulation pump and the expansion tank. Air in the system or a low fluid level are frequent culprits. The heating elements (230V or 12V) can also burn out. A faulty thermostat or sensor will prevent the system from switching on.
For a comprehensive step-by-step guide to all motorhome heating systems, please refer to our general explanation about motorhome heating not working.
Costs vary widely. A simple cleaning or sensor replacement typically costs between 100 and 250 euros. A new circuit board or burner for a Truma Combi can cost up to 600 to 900 euros, including labour. For an Alde system, a new circulation pump is often 150 to 300 euros. Bear in mind call-out charges and diagnostic fees, usually 60 to 100 euros per hour. Always ask for a quote beforehand.
If the repair turns out to be too expensive or you are fed up with the hassle, selling may be a sensible option. Also take a look at the market value of your motorhome to see what your Hymer is still worth.
Frequently asked questions
Have your Hymer valued for free and sell it without hassle. Discover what your camper is worth today via our <a href="/hymer-verkopen">Hymer selling page</a>.
