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if you have to run your hot water for a few minutes then switch it off to get the heating working then i would assume that your diverter valve is begining to stick, Make sure that all teh hot water taps running off the combi are nt dripping ecause if they are then they are the reason your combi...

either the pump is not working or someone has accidentally closed a gate valve in the hot press etc to stop flow. The boiler is overheating. place your hand on the flow pipe to see if its got very hot before cutting out.

You cannot remoe the head on these older models, Buy new sunvic or danfoss heads, remember if you have a fairly recent boiler make sure that you have a by pass fitted if you are using a lot of trv's

The pump impellers are only designed to work to a maximum temp of 60Deg, Hot water ruins the impellers and the bushing between the hot and cold chambers, what happens is that because there aould be a greater force of cold water in teh chambers it forces its way into the hot.

Drain down the system and renew the valve, allways use fernox inhibitor!!!!

I would imagine that the copper pipe that is feeding the ball valve is not secured properly, Renew the ball valve with a brass one and make sure the pipe is secured, I dont like using torbeck valves for the cold water tank because they are very slow filling-ok if you have a large tank, also you...

I would recon that you have got the pipes the wrond way around on the pressure switch

I have a recently refurbished 1600 sq ft house, The potterton suprima is located in the utility room at the bottom of the garden, Basically only the smaller rads work in the house and the larger ones are poor, bearing in mind that these are 3 years old, there is no zoning on the system and i...