2-Port Zone Valve Fail - A Day In The Life Of A Gas Engineer 77

2-port zone valve fail! Wanted to change this zone valve in situ and it didn't quite go exactly to plan. #plumbing #heating #viessmann Powered Now - Job Management Software https://www.powerednow.com/cputility towel radiator vaillant ufh underfloor heating blockage magnetite scale lockshield radiator valves electric boiler electrical wiring