The first thing to check would be the zone valve/s
They look like little silver boxes, fitted where two or three pipes meet up and will have a wire running to it. Take a screwdriver and unscrew the metal cover to expose the mechanism, then unscrew the two diagonal screws that hold this mechanism to the brass valve it’s attached to. You may have one or two of these zone valves, so check one at a time if you have two. Remember there are live wires under the metal cover, so be careful. Pull this mechanism off the brass valve and you may find it clicks back to it’s off position and the pump will then stop. It this happens, you will need to replace the sticking valve body that this mechanism was attached to.
Rupert
January 2021
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