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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
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
link Click here to see other fixes for Vaillant.