A motorized valve in one of the zones of the central heating system at home is faulty.
It is always open, even when no power is applied to it.
It is the well known HONEYWELL 22MM 2 PORT ZONE VALVE V4043H 1056
I have removed the motorized head and can close the valve by manually turning the stem that is exposed when removing the head.
The problem is that it seems that I need to turn the stem more than the motorized head does. When I have tried a new head the valve still remains open when the head has returned to its closed position.
Is there a way to get this valve fixed without changing the body?
I do want to avoid changing the body because it requires draining the system (freezing pipes is not an option). It is a large system with over
30 radiators, and this valve is on the ground floor.Thanks,
Antonio