Hello together, on vacation I wanted to start our Truma “Trumatic S 3002 P” on a cool evening … but that didn’t want to go on. We then helped us on the one evening with the fortunately available Ultraheat E-additional heating, which was also sufficient. Now … back home … I went on troubleshooting. What I could find out so far: To be sure that this is not a mass problem of the detonator, I have the front panel with a mass cab This is why I assume at the moment that the spark plug may have “heavy” it. So far, however, I could not find any information or a guide for the exchange (only) of the spark plug. The spark plugs can be purchased individually for under 20,-€ incl. postage ( ). As an alternative it would be possible to replace the complete burner replacement if necessary. Then costs around 60,-€ ( ). If it really should be the spark plug, With the 10 years old heating I still tend to this “extended” solution. So … this first to the current status. Now to my questions, before I “rare up” everything: In the course of the repair I will probably also give the ultraheat a timer, which fan and e-heating should switch on/off together. But this is another topic thank you! Greeting PS: after the rep. the gas test is obligatory for me