Done a couple of the Webasto style aux heaters on Range Rover sports , they flag a code similar ' no flame seen ' or some such , on them it's been the glow plug in the burner chamber , strip down of the unit to get at them ,on the range rovers they are really easy to access , on the Audi you may know they are behind the bumper and still a bit more to get it all out after bumper off .
There is a few tests on vcds with regards to activations maybe worth trying them , the glow plug can get fouled with old diesel if it's not run for a long time ..... worth a try before stripping out
Lee
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