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Mend Saunier Duval SD623F Boiler Gas Valve

Saunier Duval SD623F?

How can i fix my Saunier Duval SD623F/VF

It does neither get hot water nor heating. It seems that the primary high voltage powercircuit does not supply power to the transformer to get the 24V for the gas valve.
If high voltage power is supplied to the transformer the 24 circuit works correctly.

Uwe
September 2008
Saunier DuvalSaunier Duval SD623FHeating, Home Heating SystemsBoiler Saunier Duval Gas Valve
Check contacts on supply plug at rear of jig

BENDAN
September 2008

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Saunier Duval SD623F Faults & Repair