Is there any good reason for fitting a 3 port Honeywell zone valve head part no. 40003916-003 on a 2 port Honeywell zone valve (see photo). I believe the 2 port valve should have an actuator/head part no. 40003916-001 fitted.
It would appear the only time the valve closes with this actuator/head fitted is after the power to the system has been removed then switched back on with no HW demand. Once HW demand has been called for the actuator remains energised (i.e. gets and stays hot all the time even with cold pipes) and the valve is either open or partially open regardless of whether there is HW demand or not. Consequently the HW heating never turns off if the CH is on.
If I change the actuator/head I am concerned that the system wiring may have been modified to accommodate the wrong valve head and a simple head change and like for like wiring swap may cause problems; your thoughts on this will be much appreciated. I have a photo of the wiring centre which I can post if required.
The manual lever mechanism appears damaged as the mechanism grinds and slips when manually move so a new actuator/head is likely needed anyway.
If my suspicions are correct I guess Messrs Bodge-it, Collect & Scarper have struck again.
It would appear the only time the valve closes with this actuator/head fitted is after the power to the system has been removed then switched back on with no HW demand. Once HW demand has been called for the actuator remains energised (i.e. gets and stays hot all the time even with cold pipes) and the valve is either open or partially open regardless of whether there is HW demand or not. Consequently the HW heating never turns off if the CH is on.
If I change the actuator/head I am concerned that the system wiring may have been modified to accommodate the wrong valve head and a simple head change and like for like wiring swap may cause problems; your thoughts on this will be much appreciated. I have a photo of the wiring centre which I can post if required.
The manual lever mechanism appears damaged as the mechanism grinds and slips when manually move so a new actuator/head is likely needed anyway.
If my suspicions are correct I guess Messrs Bodge-it, Collect & Scarper have struck again.