Steve H Posted October 28, 2021 Share Posted October 28, 2021 This is going to sound a stupid question, but are Truma Combi 4 gas boilers supposed to be serviced? I do not recall seeing anything which suggests they do which is surprising. Thanks Link to comment Share on other sites More sharing options...
Derek Uzzell Posted October 28, 2021 Share Posted October 28, 2021 No servicing as such required - but all Truma ‘combi’ appliances may need descaling at some stage in the same way that a domestic kettle or coffee-maker may need descaling. https://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/D-scalling-boiler/49436/ Link to comment Share on other sites More sharing options...
thebishbus Posted October 29, 2021 Share Posted October 29, 2021 After a lot of years use without servicing mine started playing up. It would run for a few minutes then cut out. I decided to check for a blocked flue first of all. I disconnected the concentric inlet / exhaust hose at the output end and sucked through them with a vacuum cleaner. I was amazed at the amount of debris that came out. That cured the problem That is the only servicing it has had in 20 years. Brian B. Link to comment Share on other sites More sharing options...
Derek Uzzell Posted October 29, 2021 Share Posted October 29, 2021 As Brian has warned, the flue of a Truma combination air/water heater can become blocked. The usual culprits are insects (particularly spiders) and - if they are adventurous and find their way into the heater itself - curing the problem will be expensive. Each of my three motorhomes has had a Truma ‘combi’ heater and, when the vehicle was going to be out of use for a while, I’ve always covered the heater’s flue-cowl to stop insect ingress. As far as I’m aware Truma has never marketed a cover for ‘combi’ flue-cowls, though I think people have 3D-printed suitable covers. I use a very visible bright red plastic bowl (that I think once had a small Xmas pudding in it) that fits quite tightly over the flue-cowl (photo attached below). Link to comment Share on other sites More sharing options...
Steve H Posted October 30, 2021 Author Share Posted October 30, 2021 Thanks for the replies. It seems odd though doesn't it? After all these boilers must have gas jets which i would have thought needed cleaning just like our boilers at home. Link to comment Share on other sites More sharing options...
Robinhood Posted October 30, 2021 Share Posted October 30, 2021 In Truma's home market (Germany), it is a mandatory requirement that gas systems on motorhomes ?and caravans are inspected and certified every two years. I'm not sure how much attention is given to the actual working of any appliances, but "gas-tightness" is a major factor. (It is a precondition of the equivalent of the MOT test, and I understand there may currently be some temporary suspension due to Covid) Link to comment Share on other sites More sharing options...
Derek Uzzell Posted October 30, 2021 Share Posted October 30, 2021 This webpage may be of interest https://www.truma.com/uk/en/faq/replace-heat-exchanger-of-truma-lpg-heater Link to comment Share on other sites More sharing options...
Robinhood Posted October 30, 2021 Share Posted October 30, 2021 Having read again, the temporary suspension in Germany is not due to Covid, but rather to concerns about the calibration and accuracy of the testing equipment used. 8-) Link to comment Share on other sites More sharing options...
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