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Can't separate the air vent from the tube. The joint is locked solid. The brass neck, at the joint with the copper collar, rotates about 1/8th of a turn but stops in both directions. Should this be a soldered joint?

So does the air bleed need replacing?

[A se TTACH=full]256624[/ATTACH] I have a leaky what I believe is a pressure relief valve on the return of an Evinox underfloor system (see photos). There is a flo tube between the heating and return with a flo control (grey plastic knob in pic) set to maximum (4). Could this be the...

There is a leak from behind the combustion chamber below the expansion tank which has got worse recently. It does lose pressure but always has done slightly even after replacing the pressure relief valve. The diaphragm and some of the seals were replaced a few years back. The water is dripping...

Thanks Tony and Dave for your constructive comments and I shall now call in a corgi engineer. It is a conventional gravity fed boiler probably 15+ years old and not a combi. As for the reply from solo, I called a heating engineer to try to arrange a visit and the 'bloke', who told me he...

Thanks for the reply Dave. I am somewhat of a novice to boiler maintenance and do not know where the aps is or how to check it when I have located it. Mark

I have a Potterton PrimaB HFG conventional boiler which has suddenly decided it doesn't want to light. The flue fan appears to be working (I can hear it start and stop when switching either heating or hot water on/off). The pump also appears to work (the pipe below the pump is warm, presumably...