Low cold water pressure in only one part of the house :(

[Mandarin]

This is doing my head in, so I am turning to the experts here for any wisdom...

In the last couple of days I have very low cold water pressure in my downstairs utility room and downstairs bathroom (they back on to each other). The main cold feed (kitchen tap) is normal pressure. And all the upstairs cold taps are normal pressure.

I've checked and turned all the isolation valves. I've checked for grit build up in taps and the washing machine hose (it's spurred off feed in utility room) to no avail. I don't have a cold water tank in loft so nothing doing there.

When I closed off the cold feed isolation valve in upstairs airing cupboard it stopped cold water upstairs and in the downstairs utility room and downstairs bathroom so it looks like they get fed after upstairs (I had assumed they would be fed first).

I'm now worried all it can be is a leak 🙁 (plumber can't come until Wednesday)

Any bright ideas?

 

[fowlerboi]

What system do you have? Gravity/unvented/combi?

 

[gmartine]

Difficult to say for sure but assuming it's mains pressure to these outlets that has decreased I think you would've visbly seen a leak unless pipes a buried.

Are these outlets being fed from upstairs at the end of the circuit in which case I think you probably have a blockage.

Whatever downstairs room is fed before the other, that's where I'd start investigating.

 

[snowhead]

Can you post a photo of the upstairs showing where you've turned the valve off and any other pipework and valves nearby.
Where does the hot water come from, Combi boiler or Hot water cylinder?

 

[Deleted member 120897]

Has anything been changed, or added recently?