heating

Joined
4 Nov 2011
Messages
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Location
Surrey
Country
United Kingdom
hi when my heating system is turned to hot water my rads heat up please help
 
open system it has a cylinder and an expansion pipe to the water tank in the loft
 
Does it have one of these near the pump/cylinder ?

imagesug.jpg
 
With hw on only feel all pipes round the valve about 6"-12" away from valve if all 3 are hot then the valves passing to heating when not on.
The heating pipe should be cold when hw only selected.
 

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