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I have heard that the expansion vessels can fill up with water. Not much help I know but it's pretty much the sum total of knowledge in that area!
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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.
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If it's a pressurised expansion vessel then the diaphragm has likely failed. It's a closed system? No tank in the loft?
You'll need a new expansion Vessel, you can't replace any internal parts.
Airhead
user69121
Mr_Sworld
@lynx
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?