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Mend Vaillant Heating Temperature

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

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