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OK, thanks for the top tips. So I have a sealed system, with cylinder in cupboard upstairs with a expansion vessel next to it. Also next to it is some kind of filler tap, next to a pressure gauge. Downstairs is the boiler. This is what I think I need to do, and I would be grateful if...

OK, thanks Mick. Was hoping I could get away with just changing the Siemens motor for another one, but if change whole valve I guess I need to drain whole system. Any generic advice on draining and refilling system to a novice such as myself ? R

Given the symptoms do you think I can just get away with replacing the motor, without any need to cut pipes ? If so, will any 2 port motorised control valve motor do the job ? My local supplier doesn't stock Siemens anyway. Not being a plumber, just looking for a little guidance on what's...

Sorry Mick - I can confirm that the rads stay HOT (still get HOT) when ONLY the HW is on, also.

Yes That's right - the radiators were still heating up even when CH and HW were off, but as i say, that seems to be no longer a problem following repressurising the system, bleeding radiators, & turning boiler knob down to half. However the control valve still starts banging again when turn...

Central heating has been 'stuck on' for 2 days even though the thermostat was set to MIN, and CH and HW were OFF at the control unit. Boiler control dial was set to maximum. Checking the system, there was NO pressure in the system. I increased pressure to 1.5 bar, and bled the system since a...

Thanks again for your advice ! When Boost light is on, it will stay on all the way from 1hour, 40mins, 20min, to zero - yes. It just seems odd, that when I set the time dial to correct time as it was then of 1930, that the timer light was lit, and consequently I was unable to get the...

Thanks. Tried that. What I notice is :- - Advance main timer dial slowly, and timer light comes on about 0130, and off again about 0700. - Boost light DOES come one, but only when I select 1 hour, and then turn the main timer dial until the Timer light goes out. Q1. Is it not possible to...

Can anybody help ? Just bought a 1970 era house with the given control unit. Boost is for only one hour. I am unfamiliar with this unit, but have just pulled the instructions off the web. If I turn boost anticlockwise to START, I do not get a light showing. If I manually continue to turn...