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Time switch on Vaillant boiler not working?

The time switch on my Vaillant boiler is running slow and therefore I can't set the heating to come on and off at the appropriate times ! The clock is ticking round but is losing 10 hours in every 24 ! Is it something I can rectify or do I need a new switch ? Thanks.
Gail, May 2011
link Click here to see other fixes for Vaillant.