Honeywell V4044C1288 White V4044C Motorised Diverter Valve with 22 mm

The Honeywell V4044C1288/U is a 22mm three-port diverter valve supplied with a 230V motorised head and a 1 metre flying lead. It is a mid-position valve used in domestic wet heating systems, sitting in the pipework between the boiler and the cylinder and radiator circuits.

Its job is to direct boiler flow to the hot water cylinder, to the heating circuit, or to both at once, depending on what the programmer and cylinder thermostat are calling for. The valve has a flow coefficient of Cv 6.0, which suits typical domestic system flow rates through 22mm pipework.

* Heating comes on when only hot water is demanded, or the cylinder stays cold while the radiators heat up * The actuator head runs continuously, buzzes, or feels hot without the valve spindle moving * The valve lever moves freely with no spring resistance, indicating a failed return spring or seized spindle * Water weeping from the valve body, spindle gland or port unions * The motor has stopped driving the shoe, leaving the system stuck in one position

* Confirm the existing valve is a 22mm three-port diverter with a 230V head and note the port layout and pipe centres * Check the wiring arrangement and lead length against the installation, as the replacement head must reach the existing junction box * Inspect the port O-rings and gland seals on removal and renew them if they are hardened or flattened * Match the part number on the old valve body or head label to V4044C1288/U before fitting