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PCB code ends in B. The back casing is quite loose on it as well. It lit consistently 6 or 7 times this morning, then 1 explosive ignition (but did not stay lit, bang and that was it), now just will not light at all!! Cannot fathom it - is PCB likely cause?

Jason Thanks for your response - it was a P742 - the thinking at the moment is either that was not pre-set correctly, or that the spark quality is not consistent - would this point to faulty PCB????

Tony The guy was here on and off for 3 days, with Pottertons on the phone, there was one "probe point" at the bottom of the boiler that could not be accessed because part of the boiler obstructs access, and each time based on what was looked at and tested this is what Potterton recommended to...

Kev Perhaps that was the pressure for the gas/air mix then - sorry but I am only a dumb consumer - just trying to get as much of the info across as possible to see if anyone here may be able to offer any pearls of wisdom on what may be at fault

Hi all, great forums, hope someone can help .... I have a Range Powermax 155x that started giving explosive ignition, and occassionally would not light. The boiler had a 2 year service due so I asked the engineer I called out to service and fix it. I had a Corgi engineer round, who did a...