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24i wont ignite?

Worcester 24i will not ignite when turned on, everything else sounds normal, tried new pcb but no luck, air valve seems ok and trip on top ok any ideas????
Simon, February 2009
a bit extravagant!-new pcb immediately.
no igition on either hot water draw off or heating?
Do you have ignition?-does a spark initiate?
If the fan sound normal it could be air pressure switch not confirmng such and the boiler will stay running awaiting the air switch operation forever more!
Try pumping air either way to air switch (suction or pressure,bicycle pump or the like-but do not blow into the tube as you'll contaminate the switch if not faulty) and see if any reaction.The air switch needs to confirm fan operation prior to ignition initialising.

chris the gas, February 2009
IS THERE POWER TO GAS VALVE?

STE, February 2009
link Click here to see other fixes for Worcester 24i.