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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.....
Discuss Honeywell motorised valve not working correctly? in the Central Heating Forum area at PlumbersForums.net
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
The default position, when there is no voltage to any valve wire is for port B to be open. This is the connection to the HW cylinder. Port A is the CH connection.Oh, so it appears its all working correctly then?
So if i ask for CH its normal for the motor not to move at all, as the default position of the valve is for the CH and so doesn't need to send power to the motor to move the valve as its already in the default open position for CH?
But why if i ask for HW the motor activates but when i turn the HW off the motor doesn't move the valve back to the default position which is for CH?, surely the motor should activate (be it to open or close the valve) again once i turn the HW off??
Reply to Honeywell motorised valve not working correctly? in the Central Heating Forum area at PlumbersForums.net
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