Hello experts ! I have a problem with my factory built-in ( so NOT refitted) Webasto heater Thermo Top C ( Gasoline ) It needs at least 2 runs to be able to go through. Usually it only works on the 3rd run that it goes. Could with a small readout device over the OBD of my BMW read out a error code.I recognized the following error code : 9B29 The hour goes up without a wheel and runs and heats also about 2-5 minutes. After that it drives ( Audibly) even ” higher and then lowers down again. It then runs there on the middle level still briefly (heats probably less then) and then drives down completely. After that it goes out. I had this scenario today exact again 2 times. At 3 times it then ran through completely and correctly. Do you know what this error message means ? What cause could this have ? Thanks to you !! Greetings… uwe