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Mend Saunier Duval Combi Boiler Heating

I have a saunier duval combie boiler?

It only boosts for hot water from a tap. it doesnt boost when i put the heating on and the radiators are cold.

Mike
October 2008
Saunier DuvalSaunier Duval CombiHeating, Home Heating SystemsBoiler Heating Combi
poss pump

Bendan
November 2008

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Saunier Duval Combi Boiler - Heating Not Boosting