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I have a Honeywell value (V4073A1039) which doesn't seem to be operating correctly, basically not opening when using heating and not closing when using water. The issues is shown in this video.....
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No it's not new. Not sure if it's always been like that only been in the house since December but just got around to looking at it now as I was sure it wasn't acting correctly.Is it new? Has it always been like that? Seems like it might be motor failure or wired wrong.
The valve is not operational when only hot water is required. The boiler is turned on by the HW cylinder thermostat.
If only CH was the last call, the valve will remain in the CH only position. This is "feature" of the V4073A valve. The valve only uses 6 Watt, which is insignificant, though it will get warm. Calling for HW or turning the power off will reset the valve to the default HW only position.
The diagrams below show the various states of the valve
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