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If the air pressure is too low, water pressure will partly/wholly fill much of the expansion vessel. Then any temperature increase and corresponding increase in volume may run out of space and lift the over pressure relief valve.
If the air pressure is too high, the expanding water lifts the relief before getting into the vessel.
user69121-
Either one of these or older expansion vessels are prone to having the rubber diaphragm perish and fail which can turn it into a vessel. Mind you, if this happens they tend to leak.
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You can check the Schrader valve PSI if it has one and try to repressurise.
Domestic units don't generally have this though.
Bobbo
Mr_Sworld
From electric to water.
Why would a water tank, used as water storage for hot water activate the overflow. There is an expansion vessel which has air in it. There is alot of limescale so was thinking maybe change the valve as the valve may not seat anymore due to limescale. Then re inflate the pressure vessel to see if it holds.
What would you do?