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Took the motor off and physically moved the valve. Did notice however that the motor is still powered when it reaches its full travel, the motor must just stall when it reaches its maximum travel.

Thanks Oilman Already checked the 2 port valve, still keeps running. What further info do you need?

Recently moved into a house and ive got a bit of a problem with my central heating which I hope one of you guys/gals can help me with. The boiler is a glow worm 50e and runs continuously unless I turn off the boiler. Ive checked the room thermostat and that seems to operate ok but neither...