A couple of club members with dead Webasto heaters have been investigating the possibility of having them fixed. Hopefully this thread will pull together all useful info to determine if repairs can be done by home mechanics or independent workshops rather than going to Audi.
One of the key items is the availability of spare parts. Its very likely the A2 unit is based on the Thermo Top E model but Webasto have no cross references to the Audi unit and cannot confirm this. I guess the only way round this is to take the Audi bits to a Webasto dealer for identification.
The glow pin burner unit seems to be a fairly common problem - see attached pics and post from richard. If the Webasto unit is suitable then its about half the cost of the replacement from Audi.
If the burner unit is replaced the CO2 level of the Webasto exhaust should be checked and adjusted if necessary (should be possible using VagCom) Limit is 9 - 12% CO2 by volume. Your friendly MOT test station may come in handy for the CO2 check
Some service info for the Thermo Top C model which appears to use a similar burner unit. Its not specific to an A2 but data like glow pin resistance checking may be useful - http://www.cameltrophyvehicles.com/d...hop_manual.pdf