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Tonight, I found the start stop switch doesn't turn off the water, The water stops when I switch off the mains. With the switch in the stop position, the pump goes, when I press the switch to start it, the pump slows down slightly. With the switch in either position I can vary the speed...

Hi, my central heating pump has recently started making a noise. I keep removing the screw in the centre, to bleed it, sometimes I get air out, sometimes just a little water. I have also tried bleeding the radiators. The thing is, I have noticed that the pump seems to be on continuously, even...