I'd appreciate any help with a rad bleed problem.
All OK until plumber fitted an extra rad downstairs, since when 5 of
the 7 upstairs rads are only warm at the bottom 3 inches.
When I try to bleed one, I get 5 seconds of hissing followed by several
minutes of 'bubbling/gurgling' noises,and then nothing, even if I
leave the bleed valve open for 5 or 10 minutes.
Has anyone got any idea what the problem could be?
Is it a sealed system (combi boiler)? If so the system will need
re-pressurising via the filling loop that may or may not be attached to the
underside of the boiler, a length of stainless steel braide hose usually.
If yo have a boiler manual it will have the procedure in there.
P.S. You could always ask the plumber to come back!
Do you mean the 'overflow exit pipe???' or the return pipe from the top of
the cylinder.. Is the dribbling water warm?
It still sounds as though the outlet at the bottom of the header tank is
blocked if your upstairs radiator bleed valves never produce a flow of
Have you or the plumber left a 'plug' in the bottom of the header tank?
Not sure why it's dribbling as I believe your talking about the expansion
pipe which should only release water when the system is hot and the
contents have expanded and it release surplus water back into the header
I guess your plumber fitted the new radiator without draining down the
system by plugging the vent pipe and turning off the cock..
I've used this method when replacing radiator valves but you have to
remember to open it up again afterwards.. Maybe he just spun the wheel and
didn't check that the header tank was flowing again..
If it's a brass gate valve you will probably find that the inards are shot.
This happened to me a couple of years ago. The shaft just kept turning. I
replaced it (very easy) and the old one was totallt crudded up. I bet the
plumber has turned it off and then 'forgot to mention' it to you before he
OK looks like it might be broken or blocked..
I had similar symptoms to you a few years back and when I went to the
header tank it was stone dry, after a long hot summer, as the ballcock had
corroded and stuck up in the air. All the upstairs rads were only half
full of water!
Best of luck with the plumber but, depending where the stopcock is, it's
not to hard turn off the rising main, empty the header tank with a jug and
old towel and replace the stopcock, especially if it a compression fitting.
I suppose it's easier to say this with a workshop full of spares and tools
and a bit of plumbing experience.
Lots of luck
Michael and John,
Thanks for all your help.
As you have correctly diagnosed, the stopcock was corroded shut, and
shaft must have broken when plumber used it, allowing it to turn freely
Now fixed, though not by me.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.