In message , Bob Minchin
writes
Dave Plowman (News) wrote:
Any experts on this system boiler? Have a rather obscure fault...

Had to google this to even find out that it was Viesssmann!
Not that popular in UK - more often found in mainland Europe

If the problem is control board related then it might be worth pinging
Geoff -our local board repair expert.

We've already been discussing this offgroup

As you say - not that popular in the UK


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geoff