I recently emptied some water out of the central heating system, to put some inhibitor in. Then I topped up with the filling loop to get to the 1.5 bar pressure. But now when i turn on the hot water tap a banging noise comes from the boiler.
The noise sounds as if there is a metal piece flying inside the boiler and hitting something. It only happens when I turn on the hot water and the boilers ignition turns on. The boiler is a vaillant combi 831 on a sealed central heating system.
This never happened before, and the boilers been working fine for last couple of years.
What could make the noise?
The noise sounds as if there is a metal piece flying inside the boiler and hitting something. It only happens when I turn on the hot water and the boilers ignition turns on. The boiler is a vaillant combi 831 on a sealed central heating system.
This never happened before, and the boilers been working fine for last couple of years.
What could make the noise?