Replacement Synchronous Motor for motorised valves ACL Honeywell Landis Gye Satchwell Sopec Tower DIY Replacement 2-Port 3-Port Valve Failure

Product Information

If the property uses a combi boiler (rather than a heat-only boiler) the boiler will usually contain a diverter valve. Otherwise, if several zone valves were used without auxiliary circuits, and all were connected to the same pump so that the Live wire that opened each valve also fed the pump Live, there would be problems. Replacing a failed Synchron motor in a Honeywell motorised valve is quite straightforward, assuming you know how to work with mains electricity safely. The heated water can either be sent to the radiators (or underfloor heating) or to the cylinder coil to heat the domestic hot tap water. then checked the motorised valve, it was running and the lever moved between auto and manual easily.

System boilers may also have a diverter valve or zone valve built into them and might not have any external zone valves. They tell us that the valve has moved into the mid-position where both Heating and Hot Water ports are open. Remember, on early Honeywell motorised valves (pre-1985) you can’t remove the powerhead without draining down first! When the new motor is back in place, the flange on the other side of the motor must be held below the metal tab as before.

If all the power to the central heating system is turned off, and the manual lever is still loose across the whole slot, the mechanism may be jammed. When Heating and Hot Water are both selected, the valve drives open to the mid-position and stays there. In larger properties, 28mm valves may be used (the 5-wire 3-port V4073A1088 and the 6-wire 2-port V4043H1106).

With modern boilers, the boiler sends a Live feed to the circulating pump which then pumps heated boiler water through the valve. I was told by the Honeywell technical guy on an official Honeywell course 25 years ago that the quality replacement motor had blue wires and is heavy duty.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. We also think that all the removable powerheads carried the “pip” (or raised bump) on the top of the powerhead metal case, but we are not certain of this. Compatible with V4043H, V4044C and V4073A valves, this Honeywell replacement synchronous motor with 240VAC supply voltage is required for all modern two or three port motorised valves in any body size and pipe connection type.

Honeywell use Synchron motors and these are freely available but there are lots of cheap cloned motors out there.The motor must then be wriggled back into place so that one of the motor flanges slides back below the angled metal tab on the powerhead. 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. Fortunately I do have a multimeter but didn't need it because my valves have an led that indicates when open.

The small gear wheel on the Synchron motor fits into the round hole which has black grease round it in this picture. 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. A programmer and room thermostat (stat) are used to control heating times and room air temperatures. Remove the metal cover of the powerhead by removing the cover securing screw, then lift the cover clear. 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.

heat was dead yesterday AM so i checked everything i knew how; bled radiators, turned everything off and on again, played the thermostat temp, checked the pump (which was only replaced itself 3 months ago) and it had no air in it and seemed to be running fine, the pilot light was on and boiler seemed okay. It sounds a bit counter-intuitive, but when a switch is closed it is completing the circuit and allowing current to pass; when the switch is opened it is opening a break in the circuit and stops current from passing. The grey wire is used to drive the valve to the Water Off position, in which only the heating port A is open; it closes port B.