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Both motorised valves were replaced when this problem first started, and it is clear that they are opening and closing correctly. The problem is elsewhere, but where? The pump keeps going and it is not the motorised valves that are the cause. Any further ideas? Allan.

Thank you for reply. I have a Firebird boiler, which seems to work perfecly, and is regularly serviced. I have no froststat, nor pipestat. The problem is simply that when the clock switches off the system, the valves close normally, but the pump keeps going, until I switch off the electricity...

My System controls are not working correctly. The Problem is intermittent. I have an oil-fired sealed system controlled by programmer, room thermostat, and two motorised valves. When the programmer shuts off the system, the pump keeps on working. The two motorised valves are working and closed...