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Bypassed clock and roomstat and returned boiler to factory settings and using central heating control on boiler, hot water and central heating are fine, just waiting for electrician to see if problem is with roomstat or clock, my moneys on the roomstat. Thanks for advise so far.

Rads bled and valves are open, boiler make a noise when you switch heating on for about 10 seconds then switched off. Undid screw on pump, water sprayed out when central heating was switched on until boiler switched itself off, not sure if that means pump is ok but it was very quiet if it was...

Air vent cap is loose, pressure is ok how do i test pump?

Just had a radiator moved, system was refilled & switched on, hot water is fine but no central heating, worked fine before. Boiler is Glow worm 100e combi. Room thermostat is working as is control clock.