Honeywell V4073A1039/U 22 mm Mid Position Valve

Product Information

Honeywell 2-port motorised zone valves (V4043H) are electrically quite simple. The powerhead contains the motor, which is used to drive the valve open, and an auxiliary switch or end switch. Honeywell 22mm zone valve operation (V4043H1056) If you are able to do so safely, you could try disconnecting and isolating safely the white wire from the motorised valve, and see if the valve moves then when the power is restored. If it doesn't move the problem is with the external wiring, in that the white wire is being energised from somewhere when it shouldn't be.

I have yet to establish if the valve head ( the bit with the motor ) can be removed without having to drain the system. Apparently it is dependent on having a later model of the Honeywell valve. Two screws hold on the motor to the valve in the later models, and two others hold the plate to the valve body.Slide the blunt end of the motor sideways until the flange comes out from the tab holding it down. This can be a bit of a fiddle. The motor then comes free of the valve, held only by the two wires which connect it electrically. These two wires may be blue (in a Honeywell original Synchron motor) or orange (most replacement Synchron motors). V4044C motorised valves are 3 port diverter valves. They send flow to either the hot water port or the heating port but not both, except briefly during switchover. They are 3 wire valves. If you know how to work safely with mains voltage electricity, the valve motor can be tested with a multimeter. With the mains electrical supply turned off and isolated, the resistance across the two motor wires (either both blue or both orange) can be tested. To test correctly, at least one of the two motor wires must be disconnected from the heating wiring circuit.

In smaller properties there is usually one programmer which has two channels. One programmer channel controls the heating (radiators or underfloor) and the other programmer channel controls hot water. Where additional zone valves are used there will usually be another programmer or timer. Honeywell motorised valve construction Is there a way of easily testing whether a pump is functioning properly? I can remove mine, it has isolating valves. As Echo said, the pump is a bit suspicious because On older style valves pre-1985, which do not have the replaceable head feature, the adaptor plate assembly can be used to upgrade the valves, to allow the replaceable powerhead to be used.” We find it is normally about 2.1kΩ (2100 ohms) if the motor is cold and up to 2.4kΩ (2400 ohms) if the motor is quite warm. I think that a reading anywhere between 2.0kΩ (2000 ohms) and 2.5kΩ (2500 ohms) suggests that the motor windings are probably OK. If the reading is many times higher than that, or it is open circuit, the motor has failed.Inside a Honeywell V4073A 3-port motorised valve showing the rubber ball which closes one or other port, never both. The Y Plan and S Plan names are more commonly used when other Honeywell controls are also used (programmer, room thermostat, cylinder thermostat and wiring centre). With the valve at rest (power off) it sits in the hot water only position. When the heating is required, a live on the motorised valve's white wire (from the room thermostat) winds it to the first microswitch (SW1) where if the hot water is also required, it will stop. At this point the valve is in the centre position. If the hot water isn't required, it will continue on past the first microswitch (SW1) to the second microswitch (SW2) which should start the boiler. At this point the valve is at the end of its travel in the heating only position. If the powerhead was removed from the valve to make it easier to change the motor, it must now be re-attached to the valve. The power head cover can then be refitted and secured with the single screw. Make sure it sits squarely on the powerhead, with no wires pushing out from the sides.

Sometimes if I bang the valve with my hand sometimes CH and HW start to work after some gurgling noises When using two 2-port valves, the control system may be known as a Sundial S Plan system or a Honeywell S Plan system.

Synchron valve motors can remain energised and hot for many hours a day, all through the winter. They may eventually fail. A failed Synchron valve motor will prevent a 2-port motorised valve from working. The valve won’t be driven open and the end switch will not be made (connected) so power will not be sent on to the boiler or pump. The V4073A 3-port valve never closes water flow through the valve completely. There is always an open pathway from port AB to port A or from port AB to port B or from port AB to both ports A and B at the same time. Left to its own devices with pump on and CH and HW on, nothing seems to be happening in terms of pipes near the valve getting hot

Sometimes a powerhead is able to drive the valve only part way open but not far enough for the auxiliary circuit end switch to close. This valve will then not be able to tell the boiler to fire. Been researching the subject a bit online and found out that when the central heating is switched on by the controller, it powers the motor which in turn opens the valve plus also triggers a couple of microswitches which instruct the boiler to ignite. There is, however, more information the lever can give us if we know what we’re looking for. The lever pushes the valve open against the return spring. The valve does not pull the lever over towards the open end as the valve opens.The commonest fault with Honeywell motorised valves is motor failure. Honeywell valve motor fault? Testing a Synchron valve motor If the property uses a combi boiler (rather than a heat-only boiler) the boiler will usually contain a diverter valve. In small properties there may be no other motorised valves. V4043C1156 is a 2 port, ½” BSP Female threaded, 3-wire, normally-closed zone valve but has no end switch