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Saunier Duval heating don't turn on?

hot water works fine but heating don't work, its Saunier Duval , i have tried every thing.

asim
January 2006
Saunier DuvalHeating, Home Heating SystemsTurn Works Fine
have u checked room stat.is change over valve in right position.check micro switches above change over vavle.their is a thermistat in the heat exchanger that may be faulty.you need engineer for this boiler really

paul
March 2006

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