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Originally Posted by Scaramouche
However....they still cannot get it to work as a parking heater. When the heater is activated from the Bordmonitor or from the remote it starts and runs for about a minute and then shuts down. I have had a long conversation with Paul at Webasto and exchanged a few emails and he is convinced the problem is not with the heater as he feels the heater is doing what it is supposed to, and the problem is with the heater/AC contoller in the car. The start procedure for the heater when activated as a parking heater is as follows:
1. The heater receives a start signal from bordmonitor or remote.
2. It starts up and does an internal check, a check to see if its fuel pump is working and if the water circulation pump (for the coolant) is working.
3. If all is good it requests a run 'permission' from the cars heater/AC controller.
4. Cars heater/AC controller then checks battery voltage and fuel level and if both are OK it turns on the fans inside the car, and sends a run 'confirmation' to the heater and the heater runs for the next 30 minutes.
5. The heater will try this 'permission' request up to three times.
I think my problem is that the heater is not receiving the run 'confirmation' from the car and after 3 tries goes into shutdown.
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The actual heater should receive a 12v signal (on pin 1 I think) and it is this that tells it to start. Since yours does start, it must be getting that 12v signal initially. But have you ascertained what occurs once it is running. If that pin drops to 0v, the heater will shut down. So you need to test that and see what happens. If the 12v is cut off, then you know that it is the control systems that are wrong, but if the 12v remains and it still shuts down, then it looks like it is the heater.
Have you done this test?