Replacement options for Siemens CMV 322 3 port valve?

[Ross Elliott]

Hi All,

I’ve had a Siemens CMV 322 3 port 22mm valve on my heating system for around 4 years, but the valve has ceased. The actuator itself appears to work ok but I can only get the boiler to switch on for hot water and not the central heating.
I’ve tried to search for just the 3 way port but it appears you can only buy both together?
If I could just get the valve I’d buy it but I’m a bit reluctant to buy the whole unit again as it’s not lasted too long.
Has anyone seen the valves only for sale or can anyone recommend a replacement that would fit and work the same (Honeywell perhaps?)
I won’t fit it myself, but I don’t want an expensive swap.

cheers

Ross

 

[oldbuffer]

I'd go for a Honeywell V0473A (Screwfix 31421). You will probably have to remove the existing nuts and olives from the pipes, as Honeywell use a finer thread than most manufacturers. Bit more of a faff, but in my opinion a better valve.
No reason why you shouldn't fit it yourself if you want to. You'd need to drain the system down to just below the level of the valve.

 

[oilhead]

Once you've made sure it's not just the synchron motor that has failed, then go for the honeywell. Whatever you choose, it's a draindown.

 

[dilalio]

Convert it to an S plan.