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Mend Saunier Duval 623 Plumbing

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Mend Saunier Duval 623 Thelia

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 DuvalSaunier Duval 623D.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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i have saunier duval thelia 623 which won't fire the heating any ideas?

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