Hello to all I hope that there are some people here who have sound knowledge about the preheater at Passat 3c (please don’t suspect that I won’t get any further). Now to the problem.Passat 3c 2.0 Tdi EZ.2008 with preheater ex works. Preheater was used daily this winter and ran without problems.A few weeks ago it went out again after starting.Long speech short sense. Yesterday I removed the water pump and controlled it. After 2 attempts, the heater ran.I repeated this 3 times and run the heater every time about 15min without any problems.This morning the FB started again and after a few minutes it was out again.The strange thing is when I start the engine and then the heater runs, then it runs out.If I turn off the engine, the heater runs without any problems.That is that the heating works (water pump) e, pump, candle, etc.). Where is the error?