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Vaillant Boiler?

I have a Vaillant Boiler that keps coming on when I have programmed it not too.
Only comes on for a few seconds, Why?
Regards
Chas Beale, March 2009
if it only happens once aday it will be the pas setting (pump anti seziure)

dazza p, March 2009
link Click here to see other fixes for Vaillant.