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potterton 80e ,fan turning , no spark ?

the fan is turning but no spark , how can I test the presure switch and if its not that what next ??
gary, June 2007
air pressure switch or hoses to the aps usually cause this. just make sure they are clean and not kinked up behind the pcb. also check there is no dirt in the restrictor in the clear hose behind the pcb.

Paul the gas man, June 2007
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