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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!
Airhead-
The diaphragm can fail, hence filling with water and no longer doing it's job.
@user69121 The expansion vessel has a Schrader valve that I pressed and air escaped and not water. The valve is at the bottom.
@Bobbo Yeah this is at least 10 years old so was thinking replace the vessel and the over flow valve, for peace of mind and hassle free hopefully.
@Mr_Sworld It does have a valve, all I have here is a track pump that is now broken. So new pump.
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?