I have a mechanical Landis & Gyr timer for a fully pumped system , with motorised valves for water and heat . On occasions the pump still runs despite the timer switching heating and water off. The system is fine during normal operation. It's just that the pump runs unnecessarily. Is this likely to be a fault within the timer that gives the visual impression that it is off (CH and HW lights off) but it isn't really?
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Heating pump does not switch off
- Thread starter AlCoops
- Start date
what boiler 
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