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A valid point, but BG are unable to even service the boiler correctly what chance of them being able to adjust the gas valve? If he is on one of the fix everything contracts it won't cost him anything to change it.

Get BG back to check working pressure at the meter and appliance, gas supply should be 22mm to within 300mm of gas valve, strip down and inspect the condition of the baffles, burner and injector. While the appliance is running turn off the gas supply(which he should have done on the service to...

Just a suggestion, if it's a SIT gas valve have you turned it the extra quarter turn after lighting the pilot ?

Filter in the return blocked?

If you change just the diaphram you will need a socket to remove the stuffing box and replace the 'O' ring behind it, if you don't it will leak :cry: for £37 change the valve, lot less hassle. Yes, mains off and no pressure on heating side. Also, I think there is a slip coupling on pipe to the...

Quality site, enjoy the banter and some top tips. Couple of things to try. Dodgy gas valves, if 411 on the soleniold could be your problem Also red electrode leads, rubbish Check the gap on the electrode width of £1 coin. Worth a try before changing PCB. Yes the boilers are...