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[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...

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...