Potterton suprima 60 new gas valve?

sounds like it may be the gas valve if it's blowing during ignition, but 3.6k ohms should not cause it to blow the fuse. disconnect the lead from the gas valve and turn the boiler on, the gas valve is the last thing in the ignition sequence (except flame rec which is low voltage). it won't light, but if it doesn't blow the fuse then i'd bet the gas valve is at fault.

Ian
October 2010