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I have a worcester 35o combi with no spark?

The combi boiler is a Worcester 350 with manual dials.I switch the boiler on and it clicks but there is no spark even though the ignition is working. The gas is working. The problem seems to be with the circuit board (zagas 123) but I could be wrong.
Mark, July 2008
I have used a light to light the gas.

The spark plug type lighter is working but there is no spark coming from it.

Mark, July 2008
no spark even though the ignition is working???????

i think you may need to re-write :-)

iain, July 2008
how do you know the gas is working?

iain, July 2008
link Click here to see other fixes for Worcester.