fully pumped or Gravity hot water and pumped heating?
either way, the pump is getting a live feed constantly so there are only a few options. i need more info to try and help on the electrical side of things, depending on the system.
if you have a system with pump over-run, id say that the thermostat which is supposed to switch off the pump once the water in the rads is at an acceptable temperature, after the boiler has turned off, is faulty and is keeping the live supply to the pump on all the time.
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