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bengasman, thanks for your help so far ! - I have 3 pipes on the m/v - the m/v has to be at the output of the cylinder as the pipes are very hot at this point and the return pipe seems to enter the bottom of the cylinder. This return pipe is cooler. - not sure if hw (as appose to dhw) is...

Ok - I switched off the timer, the Synch Motor gave very little resistance. I've replaced it and the new one gives very little resistance too ! One thing I noticed is that when i switced off the electrical supply before replacing it, the old m/s gave resistance as i moved the lever. Right now...

opened silver screw on water pump - water immediately came out - still having to vent the vent beside the water cylinder. Any other thoughts ?

I bled the upstairs radiator and I get water coming out (initially had some air). Will try undoing the middle screw and see what happens. But the pipe before and after the pump are hot (assume already filled with hot water). Thanks for the inhibitor reminder - have to add that in !

does the water pump have a vent ?

its a 16-22 model

I have a Potterton Netaheat boiler which keeps switching off after a while. I recently drained the CH as one radiator value was leaking. Took me 2 days to get all the radiators working but it's difficult to get the entire CH hot as the boiler keeps switching off. Hot water is fine. Problem is...