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.
The thing that's leaking outside is the systems drain down c*ck. Tighten it up with a spanner, or even a pair of pliers, on the little square brass knob until it stops dripping. Turn it the same way you turn a tap off. If it continues dripping, then the washer inside has most likely perished and needs replaced.
See FAQ. Sounds like the pressure releif valve has gone. Which in turn might be because the expansion vessel has failed.
Thats a big assumption you made there about the bit outside being a drain c*ck. You might be right but there again the pipe may be the safety valve discharge. If it is passing water at a pressure of 0.2 bar then the safety valve is faulty, however I would advise the OP to look up the sealed system faq and try to determine if he has really got a faulty valve or if the real fault lies in the expansion vessel.
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."
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