Loss of cold water supply to bathroom - conflicting views on how to resolve the problem! Need advice

[Rob Foster]

If no cold to tap then it is most likely to be the supply pipe & its route will need to be traced.
If the other end can be found as you think in the bath room above then it should be disconnected to see if water is getting to that point before re-runing or destroying the walls.
Has anyone tried linking the hot & cold at the cloakroom basin to see if water comes out of the BOG as Rob calls it. That way you would know approx location of blockage.

the other way of lookin at this is WHAT has got stuck in pipe - just cannot see this unless its something from a tank that got past all the bends valves etc. No its air lock or maybe a bent pipe by a carpet fitter or workman or something dropped on a plastic pipe. or naughty plumber trying to make a trick out of the OP.

 

[BrendaA]

Has anyone tried linking the hot & cold at the cloakroom basin to see if water comes out of the BOG as Rob calls it. That way you would know approx location of blockage.

Yep, tried that and water did start to fill the toilet cistern. Not sure how it determines where the blockage is? I will try and go back to the contractors to try and get some more information from them on pipes and connections...

 

[BrendaA]

the other way of lookin at this is WHAT has got stuck in pipe - just cannot see this unless its something from a tank that got past all the bends valves etc. No its air lock or maybe a bent pipe by a carpet fitter or workman or something dropped on a plastic pipe. or naughty plumber trying to make a trick out of the OP.

Ah I don’t think I’m being played by the plumbers :-( Before I knew what sort of system it is, I thought it might have been an airlock so we looked into that. The plumbing has been diabolical here so it wouldn’t surprise me if it was poor workmanship... a bent pipe could be a possibility, but can’t explain why it happened so suddenly? The house is around 5 years old.

 

[Phil]

I dealt with a kitchen cold tap (cold side of mixer) which had suddenly lost 90% of its pressure. This was after Yorkshire water had been doing something in the road, water was fine in the bathroom, so I turned the water off and removed the old service valve to find a brass screw stuck in the valve, like what holds in a tap washer.

Good thing I looked there I was just about to start peppering the walls with holes...not.

 

[Michael1960]

I dealt with a kitchen cold tap (cold side of mixer) which had suddenly lost 90% of its pressure. This was after Yorkshire water had been doing something in the road, water was fine in the bathroom, so I turned the water off and removed the old service valve to find a brass screw stuck in the valve, like what holds in a tap washer.

Good thing I looked there I was just about to start peppering the walls with holes...not.

I changed a stopcock a few weeks ago, just a 15mm brass one. Customer couldnt turn it off, neither could I. I slung it in the van and later was sorting out my scrap, I happened to look at the old valve a little more closely and found it to be full of pea shingle! Yes the type they bed pipes on. Needless to say once cleaned out it worked fine.

 

[DGT plumbing]

Once found a bending spring inside a length of 15mm supplying a toilet. Customer said the toilet was very slow filling up. Spring had been in there for years and had got fat with rust.

 

[Michael1960]

Once found a bending spring inside a length of 15mm supplying a toilet. Customer said the toilet was very slow filling up. Spring had been in there for years and had got fat with rust.

Innovative flow restrictor! LOL