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igniting problem, Vokera HE29?

I have a Vokera combi HE29 (18months old) and have recurring problems, when hot tap is on boiler is running but doesnt ignite same with heating. Pressure is fine. This can last for a few days and then returns to normal, any ideas please?
daisy, June 2009
many thanks

daisy, July 2009
get them to check the venturi is clean, then check the air pressure switch is ok.

Bag A, July 2009
This sounds like either a incorrectly adjusted gas valve or flame detection probe. Not a job for am amateur.
Recommend you get an engineer to look at it.

M, July 2009
link Click here to see other fixes for Vokera.