Your expansion tank might start leaking water because of wear and tear to the parts of the tank. Take a look at the tank to find out where the leak is coming from. If the leak is coming from the pipe at the top of the tank you can try tightening the fitting yourself.Jul 27, 2020

How do I know if my expansion tank is waterlogged?

Trouble signs that could be traced to a water-logged boiler expansion tank include:

  1. Water drips or spills from the pressure/temperature relief valve on the boiler, typically at every boiler run cycle. …
  2. Boiler pressure gauge reads higher than normal pressure.

Related:

  1. Re-pressurize boiler / change expansion tank
  2. Multiple boilers, one expansion tank and fill mechanism?
  3. What are the differences between an expansion tank and a pressure sensor?
  4. Boiler heating gauge drops to negative pressure (psi) on cooling
  5. Can the water supply pass through a water heater before the expansion tank?