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A Knaus that stays cold while the fuel tank is half full often points to a blocked combustion air supply or a faulty ignition unit.
A Knaus that stays cold while the fuel tank is half full often points to a blocked combustion air supply or a faulty ignition unit. With a Truma Combi or Alde boiler, error codes such as E517H or E101H are typical for a blocked air supply or a worn glow plug. First check the fuel, fuses, and error codes, and if in doubt, have a pressure test or cleaning carried out.
Not every fault is equally serious: from an empty gas bottle to a worn circuit board, the cause determines whether you can fix it yourself or should call in a specialist.
Knaus installs a Truma Combi (gas or diesel) in most campervans and motorhomes, or an Alde water heating system in the more expensive models. Both systems are reliable but have typical niggles. If the heating stays cold or keeps cutting out, start with the basics: is there enough gas or diesel in the tank, is the 12V supply intact, and does the display show an error code? Consult the manual for the meaning of the code, as it often points directly to the cause.
Common causes with Knaus heating:
For a first diagnosis, you can consult the general explanation about camper heating. There you will read how to reset error codes, check the combustion air and when professional help is needed. With an Alde system, topping up and bleeding the heating fluid is a job for a specialist, as is cleaning the burner on a Truma.
The costs depend heavily on the part. A new thermostat or sensor often costs between 50 and 150 euros, a circuit board or circulation pump can run up to 300 to 500 euros, and a complete overhaul of a Truma Combi quickly exceeds 800 euros, excluding labour. With an older appliance, this may not be economically sensible. Also bear in mind that a poorly working heating system significantly reduces the market value of your motorhome, especially during the cold season.
Are you unsure whether an expensive repair is still worthwhile? Sometimes it is wiser to sell the camper as is. We buy Knaus campers and motorhomes, even with a faulty heating system, and arrange everything quickly and correctly. This way you avoid further costs and frustration.
Frequently asked questions
Have your Knaus valued for free and sell it to us, even with a faulty heater. We will make you a fair offer and handle the rest.
