The spindle in Drayton 2-port valve bodies only turns through about 30º (this angle is about 5 minutes on a clock face). uk/media/catalog/product/2/h/2honeywell-v4043h-motorised-zone-valve-2-port-22mm-12126-2_min_12126_P_2. Even though one valve only partly opens itself and is unable to fire the boiler, the valve on the other circuit can open fully and fire the boiler. When using a 3-port valve, the control system may be known as a Sundial Y Plan system or a Honeywell Y Plan system.

Honeywell 2 port valve faulty microswitch - DIYnot Honeywell 2 port valve faulty microswitch - DIYnot

As far as we know, the genuine SYNCHRON motors made for Honeywell have two blue wires whereas most genuine SYNCHRON motors have orange wires. The Honeywell V4043 motorised two-port zone valve with a 22 mm compression connection is designed for a variety of flow control applications in domestic and light commercial central heating systems.The most common by far are the 22mm 3-port, 5-wire, mid-position valve and the 22mm 2-port, 5-wire, zone valve. Remove the metal cover of the powerhead by removing the cover securing screw, then lift the cover clear. Apart from the few moments when it is switching between ports, Port A and Port B are not open together. Honeywell and Drayton motorised valve bodies only turn through a limited arc and you must “feel” for the points at which the movement stops.

Valve 95C-10819 - V4043H Motorised Zone Valve

I had a BG engineer in but all I got from him was "flush the system" so I want to do some detective work myself. It is used to allow independent temperature control of both the heating and the hot water circuit where the installation has pumped heating but gravity hot water. Be warned, with Honeywell motorised valves made pre-1985 you have to drain down first to remove the powerhead! Straightforward installation using only 2 screws and 2 locating pegs to connect the heads to the body.I suppose my only question now is, after following your instructions how will I know if the valve is broken / needs replacing? Much of what we describe also applies to ACL Drayton motorised valves like the Drayton 2-port ZA5/679-2 22mm zone valve and the Drayton 3-port MA1/679 22mm mid-position valve. These 22mm valves (3-port V4073A1039 and 2-port V4043H1056) are used in smaller and medium sized properties. 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. The V4043 series of 2 port Motorised Valves has a wide range of flow control applications in domestic and light commercial central heating systems.

Honeywell Home V4043H Motorised 2 Zone Port Valve 22mm

The micro switch is not getting pressed for some reason, looks like some cavity insulation polysterene balls around this area I wonder if some have got in and blocked it.

If the white wire is not used, the 28mm zone valve is wired in the same way as the 5-wire 22mm zone valve, and operates in the same way. I Have tested the wiring from the Thermostat through the wiring centre to the valve wiring where the light brown wire becomes live when thermostat is turned but the orange wire does not go live? The auxiliary circuit could be set to work at a lower voltage than mains but it is normally carrying mains voltage. 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. It doesn’t matter which of the two motor wires is connected to which of the two free powerhead wires as they are polarity free.