Recent content by Stuzzy77

Arrow on pump pointing towards 3 port and the diverter valve A heating and B hot water:

Hi, I've got a y plan system which was working fine until the pump failed. I drained the system which was sludgy and replaced the pump. The radiators are now heating up on a hot water demand even after replacing the 3 port to try and cure it. Considering reverse circulation wasn't a problem...