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There is some corrosion/scale on the plate the motor sits on but I can move the spindle with my fingers with out to much effort but I wouldn't say it moves real easily.

thanks for the speedy response. I should be able to sort it if it's just the motor. :D

I have a Gloworm spacesaver kfb50, Grundfos 15/50 pump, Sunvic SD 2701 three port actuator. The hot water works fine but the heating won't work at all. I've put the thermostat right up and switched the heating on either with the hot water or on it's own but cannot get any heating. The pump...

I have recently drained the central heating system several times as I have been replacing some old radiator valves. The boiler then began to make a crackling/creaking noise when in operation which I think was "kettling" due to a build up of sludge in the system I may have disturbed. I got a...