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my ideal boiler has hot water but can not get heating to come on?

i can get hot water but my central heating will not come on at all it does not fire up it is an ideal isar any help gratefully recieved
Julie., October 2007
you either have air in the system are if you have water cylinder check divertor valve and pump.if the two are ok check thermistor.

pat, January 2008
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