hot water pressure drop only in one place

[kalonzo]

Hi, i have a valliant combi boiler. Whenever i turn the hot water tap in the kitchen the pressure suddenly drops that very second and because of that my boiler fails to ignite and i do not get any hot water.

Any idea what could be causing the problem? I have checked the pressure bar and it is at 1.5 bar and the coldwater pressure is full on. I do get central heating throughtout and hot water in the bathroom. It must be something to do with the plumbing in the kitchen. Also sometimes when i open the hot water tap in the kitchen i get this very loud grinding noise. Cant figure out what on earth that could be causing it.

Any suggestions will be useful. Many thanks

 

[gigz]

Sounds like tap washer/cartridge problem. When you say grinding noise is it like a judder ?

 

[kalonzo]

Hi thanx

yes its like a judder. Any ideas on the reason for the drop in pressure?

 

[gigz]

Sounds like the washer is sticking in the seating, strip it down and replace it, this will probably be the reason for the loss of pressure.