Low Water Pressure

[poppysix]

Hi, I am having problems with the hot water pressure in the kitchen it is running very slow and sometimes the hot water is white, the gas boiler pressure is ok but it has gone out twice, I have tried to see if there is a burst pipe somewhere but have been able to find one anybody know what may be causing it? thanks

[The Builder]

Combi boiler or gravity system, Poppy? (Gravity = roof tank and immersion)

Mixer tap?

[poppysix]

its a combi boiler (vallient)

[SirOracle]

What is your mains pressure like poppy?
Has anyone been working on the mains to your house recently?

[SirOracle]

Poppysix
On your Vaillant boiler have you pressed the "i " button below the display. This will bring up a status code indicating the current status of the boiler.

See page 72 of your manual.

[jomifl]

The water may be running slow because of a restriction rather than low pressure. If you have sufficient pressure from your cold tap then it should be the same from the hot tap unless there is a pressure reduction valve in the hot supply. You can test this by putting your thumb over the cold tap spout and just very slightly opening it. You will feel the pressure against your thumb and should have difficulty preventing the water escaping. Do this again with the hot tap (with the boiler off to avoid scalds). It should feel the same as the cold tap, If so then you have a restriction. Usually when water at pressure flows through a restriction you can hear the turbulence at the restriction This will help you locate the restriction. It may just be a stopcock jogged almost shut. With the boiler off and the hot tap fully open try opening and closing the stopcocks to dislodge any debris that may be the problem.

[The Builder]

Also, Poppy .............. "white" water often points to a restriction in the tap itself. This causes the water to foam. The whiteness is simply air bubbles.

Unscrew the aerator/diffuser from the spout and look for obstructions.

Assuming it's a mixer tap, unscrew the valve body from the tap itself. (Turn off water supply first.) Check this for blockage. I had one only last week.

[jomifl]

Do all the taps running off the hot water suffer the same low flow?

[poppysix]

hi, its only the hot tap in the kitchen, we have recently replaced the hot and cold water tap tops in the bathroom which is next to the kitchen and the boiler went out again today and the heating pipes are very noisy like there is air in them