Honeywell motorised valves made before 1987 will also require a 40003918-007 conversion kit.
Valves made after 1987 can be identified by a bump on the top of the powerhead (see picture).
British gas no. 378453
Same as 40003916-049 but without plug.
Ask a Question about Honeywell 40003916-002 V4044C Replacement Powerhead
Hi.
If it has a 3-core cable to junction box, the 40003916-002 is correct. If it is 5-wire, then you need 40003916-003. Due to the age and nature of the fault I would recommend fitting the 40003918-007 kit as well.