Honeywell Motorised Valve Not Fully Sealed when Closed

[Berksguy]

When I have my hot water on and the central heating is off, there is still a small flow of hot water through the motorised valve for the central heating. There's sufficient flow to slightly warm some of the closest radiators. Does this usually mean a new motorised valve or is there something that can be done with the existing valve?

Thanks for looking,

Steve

 

[ShaunCorbs]

Yes the whole valve needs replacing

 

[steadyon]

1. You can get just the valve internals for Honeywell valves. Different for pre 1987 valves (no dimple on the cover) from later valves. However, fitting them is just as much, if not more, work than replacing the whole valve.
2. If the last joint on the return pipe before the boiler isn't the hot water primary (non-combi boilers) you can get spurious circulation through some or all of the radiators.

 

[Harvest Fields]

I would just change the whole valve mate.

 

[Berksguy]

Thanks for all the replies.