Eberspacher DL1 Parking Heater

Hello.

Does anyone here have experience with the DL1 from Ebersbecher?
I've had one of these in my Sprinter for 4 years now. Now that it's getting cold, I wanted to get it working again.
Unfortunately, it's been unsuccessful. The engine starts, but the heater doesn't ignite. I suspect that the glow plug might be faulty. Also, the pump isn't working either.
After approximately 3 minutes, the engine will shut off again.
I want to take the heating system apart now. Unfortunately, I only have an exploded diagram from the old DL1 unit.
'Can someone explain to me if my suspicion about the spark plug is correct, or where I should start looking? Also, does anyone have an exploded diagram that they could send me?'
I look forward to every response.

Regards,

Mäffi.

Take a look around; you might find something interesting.

http://www.espar.com/htm/tecmans.htm

CU Gremlin.