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By pump overrun, I presume you mean the pump carries on running while the valve closes. But that's only a couple of seconds or so, surely not significant? What harm could be done? When the switch sticks, the pump runs and runs and runs against a closed valve. I'd have thought that as worse...

[Firstly, apologies if this has been asked before or is answered elsewhere. I did search around but couldn't find anything.] The switch in one of my zone valves has started sticking again! (This seems to be a regular "feature" of my Drayton ZA5s! I end up replacing the switch every couple of...