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rads heat up when only hot water is on?

radiators heat up when only the hot water is selected and not the central heating

john
June 2009
Guarentee its the diverter valve if it's a combi, or the 2 port/ 3 port valve if you have a system boiler (one with a cylinder)

DC Gas
June 2009
one of 3 things,
faulty mid position or zone valve. all depends what system you have, or it's wired up wrong. no doubt it's the valve, also i bet you have only noticed it recently? because you haven't had the heating on.

anthony
June 2009

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