"DaveŁ" wrote in message
...
I ancountered a new problem with my Brittony 80 combi boiler.
The other day, I topped up the pressure in the central heating cirquit
(to about the maker's recommended 2-bar) and then switched th boiler
back on. I happenned to notice that the pressure guage then rose to
about 3 bar, so I relieved the pressure via the pressure relief valve.
Then sometheing odd started happening. The relief valve, which is
supposed to hold pressure up to 3-bar, started blowing out water at
anything above 2 bar. I took the relief valve apart and looked inside.
All seemed in order, but when I reinstalled it, the problem continued.
Suspecting a fault in the relief valve (tired spring perhaps), I
bought a replacement today. I installed the replacement, and found
that the new valve behaves exactly the same as the old one, blowing at
2-bar instead of 3-bar.
Logic tells me (but tell me if you disagree) that the most likely
diagnosis is that the pressure guage is no longer giving a correct
reading. But if that's the case, it seems strange that the fault in
the pressure guage would happen immediately after I released the
system pressure via the relief valve yesterday, don't you think?
I guess the fault could be in the actual pressure guage dial or on the
pressure sensor from which it takes its unput. What do you think?
Check that the diaphragm in the expansion vessel is not holed. If it is not
holed then check the charge pressure. If low pump it back up to the makers
charge pressure.
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