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Hot water but no heating?

My boiler will heat the tap hot water but not the heating.
The fan is on all the time but goes off when I switch to hot water only.Why is the fan on constantly? Why won't the heating come on? The boiler is a Valiant.

Dave Barrs
January 2010
VaillantHeating, Home Heating SystemsHot Water Heating
combi?

j
January 2010

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