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There's an audible click from the thermostat with approx 2 deg C difference. So for example - system just switched on with the stat set at 20C. Moved settings back and there was a click at around 18C. There is no neon indicator, so I don't know what's happening with it electrically, and I do...

We've got a problem with our CH/DHW which I think is likely to be a wiring issue. The system consists of an (original, 15 yrs old) timer-switch, original 15 yrs old thermostat, original wiring centre next to the (7 yr old) pump, and 6 year old Remeha Avanta 18v boiler. We found the CH to be OK...