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SAUNIER DUVALL THELIA 623?

My Saunier duval boiler 623 is constantly fired up?
Would this be the thermostat?

Help as this is costing me alot in gas bills!

Debbie
February 2009
Saunier DuvalD.I.Y, PlumbingSaunier Thelia Duval
Summer winter lever in the middle position. Only use in left or right .

BENDAN
July 2009
check thermister both may be not senceing temp. or if any frost stat built in it

Mr K
February 2009

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