Honeywell Conversion Repair Kit Motorised Valve 40003918-007/U

The Honeywell 40003918-007/U is a conversion and repair kit for Honeywell motorised valves used in residential heating and hot water control systems. It is supplied as a service kit so an existing valve installation can be brought back to working order or converted to the current configuration without replacing the whole valve assembly. The kit sits within Honeywell's motorised valves and spares range, the parts group that covers the actuators, bodies and internal components of domestic zone and diverter valves.

• The motorised valve no longer moves when the room thermostat or programmer calls for heat.
• The actuator head runs continuously, buzzes or feels hot without changing the valve position.
• Heating or hot water stays on when it should be off, or a zone fails to warm at all.
• The manual lever moves without resistance or does not return under spring tension.
• The valve body leaks from the spindle area or the head has failed after long service.

• Identify the valve body and actuator already fitted and match the model against the compatibility list before ordering.
• Check the number on the existing valve or actuator, including the previous number 40003918-007, so the correct kit is selected.
• Confirm whether the installation needs a replacement gasket or seal at the same time as the kit.
• This is not a gas-carrying component, but any work on a boiler or heating system should be carried out by a competent person.