One of our tennants called me this morning saying that the bolier is working perfectly and is supply hot rads and hot water downstairs only.
When they turn on the upstairs basin or bath hot tap a tiny bit of water comes out then the pipe makes a knocking noise and the water stops.
The boiler is a Vaillant Ecotec 831 combi.
Does anyone have an idea?
When they turn on the upstairs basin or bath hot tap a tiny bit of water comes out then the pipe makes a knocking noise and the water stops.
The boiler is a Vaillant Ecotec 831 combi.
Does anyone have an idea?