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my condensing boiler will heat my water but wont heat up the radiators the ?

the boiler will fire up to heat the water but wont come on for the central heating pls help
bobby, April 2010
you don't mention the make or model...
could be faulty controls i.e. timer, room stat.
either that or faulty diverter valve (if it's a combi) / motorised valve (regular boiler)

Ian, April 2010