I have just replaced my immersion tank (indirect from coal fired back boiler) and having completed that (finally!) I turned all the water back on and have now found that the vent into the expansion tank won't stop running, the expansion tank has been overflowing out the overflow and I'm left scratching my head ...
... the fire's not been lit and the pump is off so I'm not sure what's going on or why. Any help greatly appreciatted, thanks in advance.
... the fire's not been lit and the pump is off so I'm not sure what's going on or why. Any help greatly appreciatted, thanks in advance.