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Sounds like a fault in the element most likely.

1    Is it the main switch in the van tripping, the one with an RCD?

2   There should be a spur unit feeding the heater, a switch with a small fuse. If you switch it off does the mains stays in?

3   If you switch it on does the mains trip.

If 2 and 3 are yes it points to the heater being faulty.

If 2 is no it points to a wiring fault.

Not totally conclusive if the fault in the wiring is neutral to earth.

Yes you can get them from here. Need to make sure it is the element gone. They changed in about 2003 from 450W to 850W so make sure you get the right one. You can measure the resistance with an ohmeter. 450W = 115 Ohms. 850W = 60 Ohms. Either connection L or N to earth should be 1 MegOhm or more. 

http://www.leisurespares.co.uk/stock/Truma/ultrastore/

Quote: Originally posted by Rune Caster on 12/4/2010

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erm...

If the element is gone you wouldn't be able to check the resistance would you?

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Quote: Originally posted by navver on 12/4/2010

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Quote: Originally posted by Rune Caster on 12/4/2010

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erm...

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If the element is gone you wouldn't be able to check the resistance would you?

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Exactly. It would prove it was gone.

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