How do I know if my expansion vessel is faulty?
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Besides, how do I know if my expansion vessel is bad?
If you have a faulty pressure vessel then it won't be able to take the pressure rise when the boiler is on. The key indicator is that the pressure gauge will rise to 3 bar or above which will cause the pressure relief valve to open, you may notice water trickling from the pipe out side.
Additionally, how long does an expansion vessel last? between five and 10 years
Similarly, you may ask, what causes expansion vessel failure?
There are two ways the expansion vessel can fail to function properly, either the rubber diaphragm has punctured or the air on the dry side of the diaphragm has leaked away. Either way the effect is the same, namely the pressure rise as the system heats up is too large and the relief valve opens.
What pressure should be in an expansion vessel?
Some important things to consider is the air pressure inside the expansion vessel. It rarely needs to be anything more than 1.5 bar in most domestic properties. Anything more and the water may not expand into the air at the required time and could risk the high pressure relief valve opening or worse.