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Do yo only have one radiator ? Hold the ball valve with a piece of wire or string, open drain cock until the flow dies down, tighten drain cock add inhibitor release ball valve and vent as necessary.

Not a special name just a plumber :)

Sounds like a case of blockage(s) balancing and microbore pipework would be a good starter for blockages, think you may be better off getting a professional in to sort the problem.

Why do you want to change it ?

I would look towards the expansion vessel, may need re-pressurisng or may be faulty.

Try adjusting the temp settings.

If you have too many hot water outlets a combi will struggle to supply to the multi hot outlets with a poor flow rate and reduced hot water supply. The best advice would be to convert to a cylinder storage system.

Dump the combi and install a megaflow.

Intergas or valliant.

Agree with burnerman, bath tape is 22mm outlet and basin only 15mm.

Sounds like the circulation pump at fault.

If I were you, I would not attemp this work, you obviously havnt got a clue as to what you are doing and it will all end in tears. Save yourself alot of grief and get a competent engineer to do it for you.

I would be lookin for a blockage in a T or Elbow on the heating circuit. Has the system been converted fron open vented to combi sealed system.?

Its a circulation problem and 3 things to check are pump/blockage or air lock . Is the return pipe getting heat back to the boiler.

If hes pulled it all apart, sounds like a gasket/seal has been damaged and the appliance is no longer sealed. Switch off and report problem to landlord.

What you doing puuting ptfe around tap threads :lol:

First thing that comes to mind is pipes out of sight are not clipped and the water pressure is making the mains pipe whip, also I dont know how high the water pressure is in your area but may be worth turning in down lower if you have high pressure mains.

If you have a 800 enclosure you will need a 800 tray, If you have a 1000 enclosure you will need a 1000 tray etc.

Do you mean, can it go either way up :?:

Fitted new heating dial to Vaillant ecotec pro yesterday and the same thing on another ecotec pro just before Christmas and atleast 3 more repairs for the same issue early 2013, Users should lay off the shredded wheat.