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Mend Saunier Duval Home Heating Systems

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Worcester 30 Cadillac combi boiler won’t fire up and the EA?

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Mend Saunier Duval

Saunier Duval SD 623 keeps switching on and off from cold?

The burners on my SD 623 keeps switching on and off, from cold, until the temp gauge is around 40 degrees. the boiler will then work as normal. I have changed the pcb and both thermistors.
The hot water is fine and the burners always work when hot water is drawn.

Anth Mills
May 2011
Saunier DuvalHeating, Home Heating Systems
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Mend repair fix Saunier Duval home heating systems
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