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central heating

Postby johnemi » Sat Aug 18, 2007 9:01 pm

when I programme the controller for hot water only, the radiators heat up at the same time.This happens even if the room stat is not calling for heat and even if the setting for CH is in the off position on the controller.
Could this be a faulty control box or faulty motorised valve.Both are about 15 years old.Is replacing either a D.I.Y.proposition
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Simply Build It

Postby GeckoGas » Sat Aug 25, 2007 11:38 pm

Sounds like your motorised valve....

It's a DIY job if you are competant at electrics (5 wires), plumbing (Draining & filling a system) and the valve is reasonably accessible.
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