Wish I knew what that meant lolProbably Sticking end switch in zone valve for under floor circuit or stiff valve not allowing the valve to close properly. 👍👍
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Ahhhh I see what you mean. That makes sense.The zone valves are the 2 silver boxes on the left hand side with Honey well logo on them. Looking at your pic they both have a raised dimple on them which means you can just change the sliver box on the top- no need to drain system etc, just need to separate it from the valve body and swap wires over in the white honeywell junction box.
I've had a few of the wireless receivers being faulty too- the demand light goes off but still sends voltage to the valve- meaning valve stays open and pump and boiler keep running.
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Ok cheers buddy. Will doJust the one for the underfloor.....you'll have to figure out which one it is -follow the pipework behind the wooden panel
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