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http://www.campingandleisure.co.uk/cata ... fridge.jpg[/img]
i have what i think you are describing........
look
here
as the man above says, the 12v supply for the ignighter is from the leisure battery, the 12v for the fridging when driving is from the main battery via a relay...... the element for the 12v is seperate from the mains element.
I had a bit of trouble with my mains temp control earlier this year, it turned out that the actual control was dirty, and i cleaned it and solved the problem
the power for the igniter maybe switched through you leisure control panel.
the earthing could well be your problem, the ignighter and the 12v element control share the neg connection.