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Pump is definitely running, as I can hear it humming and it sounds like it is finding a trickle of water every now and then. Before tapping the pump with the hammer the casing was warm but the pump itself was silent. Yesterday none of the pipes around the pump got warm, but today after...

Pump casing is now too hot to touch for more than a few seconds so I've turned it off. Previous owners have left us with the remainder of their British Gas boiler and central heating cover...how likely is it that they'll find a way of charging us for something if I call them out?

Only some sharp but gentle taps... Pipe from boiler to pump is now hot though it cools down a few cm from the pump, pump output is still cold. Pump is getting warm, how bad is it to run the pump with no water in it?

Thanks will give it a go :)

OK I've undone the nut again, I can pull it out about 5mm then it turns freely (feels like its turning the motor?) but there is no loss of air or water...

Oh and thanks for the tip about the black nut, I had unscrewed this but it didn't seem to want to come out completely, I'll be a bit more forceful with it ;)

Thanks for the quick reply...the cylinder is directly above the boiler. The only valve on the pipework around the cylinder is on the pipe that is arrowed, its the same as the drain cock I used to drain the system behind the boiler. I assume this pipe is the cold feed for the cylinder as it...

Just drained and refilled my central heating after replacing a sheared off valve...(no leaks! :D )...my first bit of plumbing! I've bled all radiators starting from downstairs but after running the boiler they remained cold. (conventional open system with tank in loft space) I then noticed...

Thanks everyone...very interesting! 1.0mm²

Well to be truthful, he is a qualified sparkie and works for an electrical place but no longer does electrics, hence not part P accredited and possibly not up to date with the latest regs. Part of my extended family hence he may well have found it 'lying around', possibly at work ;) He has a...

Just a quick one as I can't find this in the Wiki... My sparkie has left me with 1.5mm cable for rewiring my lighting. (running into new conduit I am channelling into the wall) However we will also be replacing the wiring going to some existing switches, and as the conduit is congested I was...