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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

home Fix label Heating label_important Home Heating Systems category Vaillantdone

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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home Fix label Heating label_important Home Heating Systems category Vaillant

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

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

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

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