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saunier duval thelia 623 boiler ?

fan runs on saunier duval thelia 623 but no heating and hot water
BRETT, November 2010
carefree's right but check front case to burner/heatexchanger is sealed fully (location lugs on top clips on bottom-seal rubber okay. any air leak and air pressure switch which sences a vacum in boiler just won't

deano, November 2010
Probable air pressure switch failure

Carefree, November 2010
link Click here to see other fixes for Saunier Duval.