Non-contact voltage testers are much safer to use than traditional neon testers. To test correctly, at least one of the two motor wires must be disconnected from the heating wiring circuit. Port A or port B can be closed by a rubber ball, though never both at the same time. When all electrical power to the heating controls is switched off, the spring pulls the ball across to close port A, leaving port B open. The rubber ball in the Honeywell valves can become dented if left in the hot water only position for a long period. Trustpilot. In the past, Honeywell told us that the motors made for them produced a higher level or torque than the standard SYNCHRON motor. When the powerhead is lifted away from the valve body, the jammed mechanism may free itself and spring back into position. All was ok until 4 or 5 days ago, now, although the heating runs ok, boiler is fine etc, I cannot stop the hot water ! Here is a picture gallery about honeywell 3 port valve wiring diagram complete with the description of the image, please find the image you need. Most Honeywell V4043H zone valves are also fitted with an auxiliary circuit, two wires, a grey wire in and an orange wire out, connected by an internal switch or end switch. However, if hot water was satisfied and heating was the last thing calling, the valve can remain partially energised with the heating port open. 1, As the system was "designed" with a 3 port valve, will changing 1 x 3 port valve to 2 x 2 port valves cause any issues with pressures and or balancing the system? Thereâs usually a clue in the price. The valve will remain in the Heating Only position (port A open; port B closed). Youâll have to check. If you are able to safely remove the actuator, use a spanner to move the spindle repeatedly and it will usually become free. We isolated the electrical power from the central heating wiring controls and disconnected the auxiliary circuit of the Tower valve. Then, using a non-contact voltage tester like the Fluke volt stick above, check that the system is safely isolated. On earlier motorised valves, these were both joined to other wires using metal crimps encased in plastic. The valve typically has 5 wires: green/yellow = Earth; blue = Neutral; brown = Switched Live from room stat or from cylinder stat; grey = Permanent Live; orange = Switched Live feed to boiler (and pump). The electronics in Honeywell motorised valves tend to be quite stable and show relatively few faults but the motor may fail after years of operation. High flow rate. These two wires may be blue (in a Honeywell original Synchron motor) or orange (most replacement Synchron motors). Also applies to ACL Drayton, Iflo and British Gas Motorised Valves. Remove the motor securing screw which is located at the side of the Synchron motor. The valve spindle did not feel unusual (tight) when we pushed the lever against the spring and the valve returned normally. The rubber ball is moved between ports A and B by an actuator shaft or spindle which is driven by the powerhead. (Remember, the orange wire can also get 230V from the cylinder stat if it is calling and a hot water program is on.). If we come across a very old valve without the pip (and these are usually 20 or more years old) we never remove the powerhead! If it had opened the heating port (and the lever become loose for all, or nearly all, of the travel in the slot) we would have been looking for a fault elsewhere, either a fault with the central heating programmer or the room thermostat or with the wiring. Slide the blunt end of the motor sideways until the flange comes out from the tab holding it down. The wires should go round the motor, not across the top of it. Honeywell make a large range of motorised valves used in domestic central heating systems. The auxiliary circuit (grey and orange wires) is commonly used to operate the boiler and/or the circulating pump. The Honeywell V4073A is a spring-return valve. Its a vented system about twenty years old with a honeywell 3 port valve installed near the HW tank, when the CH is calling for heat the two pipes connected to the valve outlets get equally as hot, the rads get hot but I get a build up of hot water in the tank. Honeywell 2-port motorised zone valves (V4043H) are electrically quite simple. We close a switch to make the circuit complete; when we turn on a light switch we are closing the switch. Obviously the first step to be taken is to change the faulty valve. 3 Port 22mm or 28mm Motorised Zone Valve Head Can Replace Honeywell V4073A1039 V4073A1054 V4073A1088 V4073A1062 4.3 out of 5 stars 218 £28.25 £ 28 . We changed the failing zone valve with a new 22mm Honeywell V4043H zone valve and tested the operation. problem is that one of the motorised valves is permanently open (the one for central heating) I've removed the cover and tried moving the valve manually but it is solid. The grey and orange wires remain permanently connected and there is a permanent demand sent to the boiler (and pump). (See Honeywell Motorised Valve Manual Lever, below.). These crimps can sometimes be re-opened by using pliers to squeeze together the edges of the flattened tube. So, if you set the system for Heating Only (Hot Water must be off or satisfied on the cylinder stat) the valve motor drives the valve to close port B while it leaves the heating port A open. If the powerhead (actuator) can be safely removed from the valve body (see warning above about pre-1985 Honeywell valves) you can try to turn the spindle. Using an auxiliary circuit and end switch is clever design for two reasons: If the valve motor fails, the motorised valve will not open. In the UK most domestic Honeywell zone valves are either 22mm compression (V4043H1056) or 28mm compression (V4043H1106) though they are also available as �" BSP Female (V4043H1007) and 1" BSP Female (V4043H1080). In that case it should be made safe electrically.These valves have compression pipe connections, though Honeywell make motorised valves with threaded connections too. As weâve said above, Honeywell make a large range of motorised valves. A failed motor will prevent the motorised valve from opening but it is not the only cause of a valve failing to open correctly. The most common by far are the 22mm 3-port, 5-wire, mid-position valve and the 22mm 2-port, 5-wire, zone valve. Original Synchron motor removed from the Honeywell V4073A valve. The Honeywell V4043H1106 28mm 2-port zone valve has 6 wires. Water enters via port AB. There's no reason to suspect the programmer. If central heating was selected too, and the room thermostat turned up so that the radiators came on, the hot water would heat up. Customer reported radiators getting hot whenever hot water was selected and with no heating selected, Boiler stays on, permanent demand even when programmer is switched off. In small properties there may be no other motorised valves.In medium sized or larger properties, using a combi boiler, there may be an additional zone valve external to the boiler which allows the heating to be split into two zones.System boilers may also have a diverter valve or zone valve built into them and might not have any external zone valves. This system had 2 Honeywell V4043H two-port motorised zone valves, one controlling the radiator circuit and one controlling the hot water circuit. We switched off the power and the valve rested in the hot water only position. Temporarily freeing the spindle may make water seep past the O ring seals. With hot water selected on the programmer, and the cylinder thermostat calling for heat, we checked the lever and it was loose across the whole travel of the slot but the boiler didn't fire. The inlet port AB can never be closed; the ball only moves between port A and port B. So, if the lever is only loose for the first Â¼ of the slot, the valve is in the Hot Water Only position. It works like this: One of the two wires, typically the grey, is connected to a permanent mains Live supply (about 230V AC in the UK). The small metal gear wheel on the bottom of the motor goes through a hole in the powerhead base plate. This is called closing the switch. After forcing it open, if you release the lever it will be pushed back towards the Auto end. This page is copyright but if you want to link directly to it from your own web site the hyperlink is: http://www.lovekin.net/honeywell-motorised-valve-faults.html. Even if the valve is not stuck open the switch contacts can occasionally be found to have welded together (caused by the spark arcing across the switch contacts). We never use cloned motors. If you remove the powerhead and operate the valve mechanism manually using a small spanner, be careful not to turn too far or too hard. I was getting lots of bubbling noises when the hot water fired up. In our experience this has always been a very slow seepage at most. Once the cover is back in place, the power can be re-instated and the operation of the motorised valve can be tested. Unscrew both of these screws. Weâre told that the ball touches one edge of the circular port first, causing the ball to rotate slightly on its spindle. This white wire might not be used. It will make it easier when re-fitting it (just remember which end the flex was connected or take a picture on your phone). Typically, in this position, the lever is loose in the slot for about one-third of its travel, with the remaining two-thirds of the travel pushing against a heavy spring. In larger properties, 28mm valves may be used (the 5-wire 3-port V4073A1088 and the 6-wire 2-port V4043H1106). We also think that all the removable powerheads carried the âpipâ (or raised bump) on the top of the powerhead metal case, but we are not certain of this. The most common cause of non functioning of the 3 port V4073A valve is motor failure. First, isolate all electrical power from the central heating system controls. Boiler fired up when there was no demand from the programmer, sometimes in the middle of the night. The V4043 series of two port Motorised Valves has a wide range of flow control applications in domestic and light commercial central heating systems. When using a 3-port valve, the control system may be known as a Sundial Y Plan system or a Honeywell Y Plan system.When using two 2-port valves, the control system may be known as a Sundial S Plan system or a Honeywell S Plan system.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). When the valve is driven fully open by the signal from the programmer, the internal end switch closes, connecting the grey wire to the orange wire which also becomes Live. After isolating the electrical power we disconnected one lead from the motor within the valve actuator and checked the resistance through the motor across the two motor leads. My central heating has a problem with the 3 port diverter valve. 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. It often becomes stiff to turn at first and the valve may give intermittent problems. Power for the boiler is still supplied directly from the cylinder thermostat. When Heating Only is on, and then is switched off or the room stat demand is satisfied, a lower voltage of between 50V and 150V will remain on the orange wire. If the actuator cover does not have a raised pip on the top (a reversed dimple), do not remove the actuator or you'll get a flood. We think these older valves are pre-1985 and that seems to be backed up by this note in the Honeywell Flow Solutions pdf:âOn 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.â. With earlier valves, the cover was completely free. In normal operation, with a heat-only boiler, central heating water is heated in the boiler and then pumped round the system by a circulating pump. 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. You may need a tool unless you have strong fingers. On the other side of the motor there is another flange which is located below a metal tab. With this design the ball tends to round itself up and avoid permanent dents. If both heating and hot water valves are closed when this happens, the heated water from the boiler will pass through a bypass, if one is fitted, before going back to the boiler. For information, the Tower VAL222MV valve appears to be a clone of the equivalent Honeywell valve (or maybe the same valve badged as a Tower valve. Honeywell 3 Way Valve Wiring Diagramâ wiring diagram is a simplified enjoyable pictorial representation of an electrical circuit.It shows the components of the circuit as simplified shapes, and the capability and signal friends in the company of the devices. The motor will continue to be energised (though on lower power) and will remain warm. V4073A1039 is a 3 port, 22mm compression, 5-wire, mid-position diverter valveV4073A1088 is a 3 port, 28mm compression, 5-wire, mid-position diverter valveV4073A1054 is a 3 port, Â¾â BSP Female threaded, 5-wire, mid-position diverter valveV4073A1062 is a 3 port, 1â BSP Female threaded, 5-wire, mid-position diverter valve, V4043H1056 is a 2 port, 22mm compression, 5-wire, normally-closed zone valve with an auxiliary end switchV4043H1106 is a 2 port, 28mm compression, 6-wire, normally-closed zone valve with an auxiliary end switchV4043H1007 is a 2 port, Â¾â BSP Female threaded, 5-wire, normally-closed zone valve with an auxiliary end switchV4043H1080 is a 2 port, 1â BSP Female threaded, 6-wire, normally-closed zone valve with an auxiliary end switch, V4043C1156 is a 2 port, Â½â BSP Female threaded, 3-wire, normally-closed zone valve but has no end switchV4043B1257 is a 2 port, 22mm compression, normally-open zone valve, no manual lever, no end switchV4043B1265 is a 2 port, 28mm compression, normally-open zone valve, no manual lever, no end switch. Sometimes you can clearly feel that the valve is stiff, indicating that the valve spindle may be seizing up. But be warned! Motorised valves are used to split or divert the flow. With the boiler running, the pipe from the motorised valve (port A) to the radiators immediately became hot, indicating a fault in the valve. Please read our Legal Disclaimer. Make sure it sits squarely on the powerhead, with no wires pushing out from the sides. It makes no difference.In the case in this email the valve spindle has probably seized (water gets past the O rings and causes corrosion). qty. These valves fail-safe in the open position in the event of a power failure or valve motor failure. 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. With older boilers, the Live from the auxiliary circuit end switch goes directly to the pump at the same time as it goes to the boiler Switched Live. Early Honeywell motorised valves had actuators (powerheads) which could not be removed without draining down first. Most Honeywell zone valves are closed in the de-energised state (all of the valves above) but Honeywell also make a 22mm compression zone valve which is open in the de-energised state (V4043B1257) and a 28mm compression zone valve which is open in the de-energised state (V4043B1265). Radiators and hot water both worked normally in this house except that the customers could hear the circulating pump running occasionally in the night and the boiler would sometimes fire up, even though there was no demand from the programmer. VAT £40.00. The heating circuit valve may be open for long periods telling the boiler to fire. The Honeywell mid-position motorised valve has three ports in a T configuration. The manufacturing date code is written on the side of this motor, 9823, week 23 in 1998. The Honeywell V4073A motorised valve rests in the hot water only position (the heating port, A, is closed) when the valve is de-energised. This often happens during the Summer when no heating is called for. On modern Honeywell valves, if the powerhead fails it can be removed from the valve body without draining down. This is because the lever can only drive the valve just a little past the mid-position but the motor drives it much further. Move the valveâs manual lever to the manually open position. V4044C1288 is a 22mm compression, diverter valve feeding one port at a time onlyV4044C1569 is a 28mm compression diverter valve feeding one port at a time onlyV4044C1098 is a 3/4â³ BSP Female diverter valve feeding one port at a time onlyV4044C1494 is a 1â³ BSP Female diverter valve feeding one port at a time only. A characteristic of the V4073A Three Port Valve is that it will hold last held position, stall in the last held position. 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. With modern boilers, the boiler sends a Live feed to the circulating pump which then pumps heated boiler water through the valve. If you know how to work safely with mains voltage electricity, the valve motor can be tested with a multimeter. The problem the customer has is that boiler will not turn off. They are fitted with a manual lever, running in a slot on one end of the valve. With the 3-port valve, port A is closed and port B is open when the valve is de-energised. screwfix are doing another 3 port valve on special offer. The orange wire provides a Switched Live (Switched Line) feed to run the boiler and pump. We replaced the failed British Gas BGMVSP-2 two-port valve with a Honeywell V4043H 1056 motorised valve and the problem was resolved. Can be replaced without draining down. 3 Port 22mm or 28mm Motorised Zone Valve Head Can Replace Honeywell V4073A1039 V4073A1054 V4073A1088 V4073A1062 4.3 out of 5 stars 218 #1 Best Seller in Bathtub & Shower Diverter Valves This figure is normally about 2400 ohms but in this case the leads were open circuit, with a resistance reading millions of ohms, indicating a break in the motor windings. Remember, it only ever moves through about 70� for 2 port Honeywell valves and only about 45� for 3 port Honeywell valves so don't force it! With the programmer set on hot water I cheched the ports A and B, they both getting hot at the same rate, suggesting valve position open for both ports. They may eventually fail. The boiler will not fire (with no open pipe circuit to dissipate the heat), unless another motorised valve opens another pipe circuit and calls the boiler into action. Honeywell 2-port valves have an end switch in the actuator (also called the power head) which closes (makes contact) when the valve is fully open. This section also applies to most other makes of motorised valve too, not just Honeywell valves. Ive got a Y-plan fully-pumped central heating system, but when the controller calls for CH, the synchron motor (in the Honeywell V4073A mid position valve) is not moving the valve round (and hence the boiler is not firing). We received this email which raises a quite common fault on motorised valves: Recently called out to a 'S' plan heating system incorporating a Honeywell ST999 programmer and 2 V4043H motorised valves. In smaller properties there is usually one programmer which has two channels. If Hot Water is turned on again, or all the mains power is turned off, the motor will be de-energised and the spring will pull the valve back to the Hot Water Only position (port A closed; port B open). 3 Port Valve, Mid. You must also isolate the electrical supply before removing a Honeywell motorised valve powerhead. The only way to switch off the boiler is by isolating the programmer via the fused spur or by turning the thermostat on the boiler right down/off. Designed to withstand harsh conditions, these are ideal for users in oil and gas, power, petrochemicals, steel and other manufacturing sectors. The pump then pushes heated boiler water through both the open valve and the partially open valve. When Heating is also called for, the white wire is energised and the valve will motor to, and stop in, a mid-position. Isolate all electrical power to the central heating system and test to ensure that it is electrically safe. The same thing can occasionally happen if the end switch arcs, welding the contacts together. (Push it towards the MAN OPEN end of the slot and lift while releasing it, so it settles into the hook at the top of the slot.). The manual lever of the 3 port valve was only slack for about one third of the length of the slot which is the normal position for hot water only. There’s a section, We’ve written a longer, more comprehensive article about Honeywell motorised valves and their faults, Customer reported that hot water would not heat unless the radiator heating was on too. 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. They tell us that the valve has moved into the mid-position where both Heating and Hot Water ports are open. Hi all, I have a problem with my system, the HW and CH seem to be on together, when the CH is on it also heats the HW. If no bypass is fitted the boiler may kettle violently, with loud bumping and banging noises as the heat can’t be dissipated, and it may to go overheat lockout. The range includes 2 port and 3 port mid-position valves, replacement heads, synchron motors and valve bodies. View the Honeywell 3 Way Valve Manual for free. 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. The cut end of this wire must have the insulation stripped back. Knowing this, we can now feel for the mid-position (Heating and Hot Water both open). Under Part L of the Building Regulations, many new properties must have the heating radiators (or underfloor heating) split into two zones. These 22mm valves (3-port V4073A1039 and 2-port V4043H1056) are used in smaller and medium sized properties. Horstmann 3 Port Motorised Valve, 29 quid. The valve will not then close the end switch and so will not complete the auxiliary circuit. It is now relatively unusual for the white wire (6th wire) of a Honeywell 2-port zone valve to be used. Neither valve remained in the permanently open position when the demand was switched off so the problem was most likely caused by an auxiliary switch welded in the connected (closed) position. Old Satchwell Sunvic valve bodies used to turn through a full circle, as did Switchmaster Midi valve bodies. They are 3 wire valves. Trustpilot. Hi all I have a Honeywell 3 port valve and had the heating engineers out as the heating was not working, but the hot water was fine. You set the valve into the manually open position by turning the power off, then pushing the lever towards the Man Open end of the slot. With the power back on and hot water only selected, the valve rested in the correct position. Both valves had auxiliary circuits and one of these was causing the boiler to run but we had to decide which. Most Synchron motors have orange wires. Sometimes it is possible to free a sticking valve, at least temporarily, by repeatedly driving the valve open manually using the lever (with the system switched off) or by removing the power head (the actuator) and repeatedly operating the valve manually using a small spanner. When the cover is removed you have access to the two screws which secure the powerhead.These screws are diagonally opposite each other and pass through the steel base plate of the powerhead (actuator) into the brass flanged top of the valve body. Why go to the trouble of draining the system down, changing the whole assembly, refilling, bleeding and having to add new inhibitor, when for a similar price you can just change the head/motor which is an easy half hour job. We believe that the valves with powerheads which can be safely removed are the ones with the "pip" on the top of the silver metal case but we are not certain of this. Have a look at the manual Honeywell 3 Way Valve Manual online for free. We changed the motor for a new genuine "Synchron" motor (our experience of cheaper, generic motors is that they can fail very quickly) and the system worked fine, with the mid-position valve opening to heating correctly on demand. Remove the metal cover of the powerhead by removing the cover securing screw, then lift the cover clear. Everything worked normally with the hot water now operating correctly on its own again. This fault is most commonly caused by a motorised valve. This creates a living zone and a sleeping zone which both have separate time and temperature controls to improve energy efficiency. The powerhead can only fit one way round onto the valve body but if space is tight that might not be obvious. The auxiliary circuit could be set to work at a lower voltage than mains but it is normally carrying mains voltage. The V4043H normally closed models have end switches for electrical control of pump and/or boiler. £85.79 each. This ball was either permanently damaged or the seating was damaged or contaminated so we changed the complete valve, both the power head (actuator) and the body and the problem resolved, hot water cylinder warming up normally with no unwanted hot radiators. Unless the valve is very old (pre-1985) it should be possible to remove the powerhead from the valve body without draining down. Nibe Part code 624888 If the property uses a combi boiler (rather than a heat-only boiler) the boiler will usually contain a diverter valve. There were two motorised valves fitted to the system we were looking at, a Tower VAL222MV two-port valve controlling the radiator circuit and a blue British Gas BGMVSP-2 two-port valve controlling the hot water circuit. Valve will remain warm a generic term for a long period mid-position ( heating and hot water circuit also..., port a is normally connected to feed water from the valve motor the problem remained, suggesting was. 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