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Mechanical Timer Slowdown on Vailant Boiler

Joined
30 Jul 2013
Messages
103
Reaction score
4
Location
Surrey
Country
United Kingdom
Hi All

My parent are noticing a problem on their Vailant boiler mechanical timer.

We keep correcting the clock, but everyday it seems to lose about 1-2 hours in time.

Any idea what could be causing this? or is it most likely just a failed clock that needs replacement?

Thanks
 

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