Can someone please, please explain what this does.
Since I turned my heating on last month, I either get hot water or heating (unless I run them both all day)
During the summer I had the water on for 90 mins at each end of the day which was fine. Then after I turned the heating on, the water was colder than normal which I assumed was because the coil in the tank was taking away the heat (thats as far as I understand it)
The system has a Honeywell V4073A 1039 zone valve fitted, with a little lever at the bottom. It can be locked in MAN OPEN, or pushed across to AUTO. If I dont lock it in MAN OPEN it floats back in the middle of both.
Could you explain what the valve does, and what I should set it to....