"i-ball" wrote in message
...
"Ed Sirett" wrote in message
news
On Thu, 16 Dec 2004 16:58:51 +0000, i-ball wrote:

i have a glow worm combi and the pressure gauge keeps going to 0.2
bar.
The
plumber I spoke to says that the boiler I have should have a pressure
of
between 1 and 2 bar. I used the refill tap to raise the pressure but
after
a few minutes this goes back to 0.2-0.3bar. I then noticed outside by
a
drain pipe hot water was coming out so I thought this is where the hot
water
is going. How do I stop it from draining and maintain the pressure?
Thanks.

See FAQ. Sounds like the pressure releif valve has gone. Which in turn
might be because the expansion vessel has failed.



Thanks for pointing me to the FAQs. I think my problem is this:

"The relief valve will have a test knob on it that lets out water into the
discharge pipe. It is a bad idea to operate this as the slightest piece of
debris on the valve seat will cause the valve to dribble."

What can I do to remedy it? Would I need to replace the valve?


Just to reply to my own quiery, I found the following statement from
another web site:

"

If the pressure is normal in the system and the relief is leaking, scale or
rust maybe trapped in the valve seat. Open the relief by lift the manual
lever and allow water to blow off. Quickly release the valve and let it snap
back, to reseal the valve. Replace the valve if the problem persist. Never
block the relief valve opening. If the water leak cannot be stop then pipe
the water to a drain until it can be repaired or shut down the boiler and
close the water feed. NEVER BLOCK THE RELIEF VALVE."