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Any ideas - any one??? Cheers Carl.

Many thanks for the suggestion -- the problem still persists even after the gas valve and board has been changed!! Assume that the boiler is left OFF over night. If the pilot solenoid is separately energised with a mains supply for about 15 seconds (to purge the gas valve). Then the solenoid...

Can anybody help please? If so please reply and I will forward details of my email address. Cheers Carl.

Dave As said previously, a small positive pressure was applied to the pressure switch pipe so that the switch triggered and the pcb thought the fan was running thereby initiating the sparking. We have basically fooled the aps into thinking the fan is running - otherwise we wouldn't get the...

Thanks again for your help. The fan was disconnected merely to cut out its noise so that we could hear if gas was coming from the pilot jet. Bear in mind that the main burner valve was also electrically isolated so that the burner could not fire up. I don't see how it can be a PCB fault...

Well the installer has been back and several more tests carried out. With front cover off, main burner solenoid electrically isolated, fan disconnected, and a small positive pressure applied to the RED pipe to the pressure switch (to simulate the fan is running) the following has been deduced...

Dave - I just reread your message. I had confused your comment about the relays, taking it to mean solenoids - hence my comment regarding the gas valve. That said, from previous tests the pilot solenoid has 240 volts on it after the fan turns on and prior to the first spark so surely it should...

Dave - thanks for the reply. I think it unlikey that it is the solenoids as the gas valve complete has already been changed with no effect. The gas fitter has ordered a new electrode just in case it is playing up - he said it was highly unlikely but something else to rule out. Ideal seem to...

I had this boiler fitted a few weeks ago. All was fine until I noticed by chance when I was washing early one morning that when the boiler starts up in the morning you can hear it sparking for upto 15 times before the pilot lighte and then the main burner. For the rest of the day it lights...