Webasto (auxiliary heater) problems

[Mentat]

This is my third car with Webasto problems!
I've changed 3 Webasto's on my wife's GL and one in Range Rover Sport.
All had the same problem... (diesel or petrol)
After 10s... bye

The system does not start. (fuel level and battery ok, low temp outside)

I believe the problem is the fuel supply, but the dealers prefer to change the whole unit under warranty.

So... is me the only one cursed?
The car is brand new!

BMW X6M!

Also, I would like to use a T100 remote! It has a small LCD display that can tell me if the system is working.
The question is: do I need only the T100 remote or more (controller and receiver)?