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Mend Saunier Duval thelia 23 Boiler Pcb

Saunier thelia 23 boiler not igniting?

I have a fault on the boiler, Everything seems to work but it will not ignite. I have checked the voltage to the solenoid on gas Valve and it reads 9v on demand and not enough to open the valve. I am guessing that it should be 24v.
Am i right in assuming thr fault is on the pcb.
Can anyone help to identify the suspect component on the board.

manu
December 2010
Saunier DuvalSaunier Duval thelia 23Heating, Convector HeatersSaunier Duval Boiler Pcb

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Saunier Duval Thelia 23: No Ignition - Help!