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Vaillant boiler -heating comes on for 30 mins during early morning ?

Vaillant boiler -heating comes on for 30 mins during early morning even though analogue clock not set for that time. Is it time for a new clock, or is it something more serious????

Janet Bouleghlimat
November 2008
VaillantHeating, Home Heating SystemsHeating 30 Mins
Thanks for that, but it's never done it before. does it make a difference if I say it is a combi boiler?

janbou
November 2008
it should come on for apx 5min to keep the pump active
not 30 min

bob
November 2008

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