Potential Problem with Cold Water Flow....?

[dunelm]

Hello, I am hoping to get some guidance, I'll try to be as specific as possible.

I live in a three storey house that is 12 years old. We have a boiler with a Megaflow hot water tank, one bathroom ground floor, two middle floor and one top floor.

The sink and shower in the top floor bathroom all seem to suffer from problems. The sink spits and stutters cold water when you first turn it on, this seems to be any time of the day. The shower pressure has dropped significantly and sometimes this seems to stutter too and only really picks up pressure if you turn the temperature of the shower up. If I put the shower on cold only it turns to a real trickle. The hot tap of the sink has no issues.

The middle floor bathrooms have no issues whatsoever.

I have checked under the sink and the water pressure after the stopcock is showing at 3.1 bar. If I turn the stopcock off it goes to about half a bar.

Wondered if anyone had any ideas / suggestions? I think that's all the info I have but am hoping someone can suggest something.

Thanks so much,

 

[ShaunCorbs]

I'm guessing you have a presdure reducing valve under the sink any chance of a couple of pics ?

 

[dunelm]

I'm guessing you have a presdure reducing valve under the sink any chance of a couple of pics ?

Thanks for coming back to me. I have this under the sink.... appreciate the help.

 

[ShaunCorbs]

There's a filter on the inlet side of the pressure valve might need cleaning or the pressure valve replacing

Depends how good your plumbing diy skills are

Or get a pro in

 

[dunelm]

There's a filter on the inlet side of the pressure valve might need cleaning or the pressure valve replacing

Depends how good your plumbing diy skills are

Or get a pro in

That’ll be get a pro in! Many thanks. Have a good weekend

 

[Welder]

Agree its never been serviced, you can tell as the plastic body would show marks, but only affecting one floor imho isnt likely to be just the prv.
Id be looking for something else too. A partially closed or calcified cw valve for example.
DEF needs to start with a full service tho. BTW & FYI, the pro needs to be G3 qualified. Thats NOT anything to do with gas but a specialist quali.