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How does central heating turn itself on when timer is off?

I have a Vaillant THERMOcompact 624E. How does the heating turn itself on at times when the timer is switched off. Is this just a faulty timer switch?

Paul
January 2007
VaillantHeating, Home Heating SystemsCentral Heating Timer
Usually caused by the frost stat being trigged. This is wired in parallel to the timer so as to over ride it in the event of frost.

allgasinstaller
January 2010

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