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Thanks for your help on this. Having done all the checks mentioned, I think you're right and it's a stuck valve. Having a new one fitted by someone who hopefully knows more than me! Cheers

Thanks for replying. The valve appears to be a Daytona MA1.

That's very good of you thanks. I'll check it out whilst the weather's good!

Hi, I've just checked and it's always in the W position, powered up or not, which would indicate that the heating shouldn't be on? Thanks

Thanks for replying and sorry for the late response. I'll check it tomorrow.

Thanks for replying. The valve appears to be a Daytona MA1.

hi Looking at this thread last night, I was most impressed by the help, and wondered if I could put forward my problem. I have a Worcester Danesmoor 20/25 installed about 8 years ago. It has a Honeywell control box with, what I assume is the 3-way valve mentioned. The thermostat is a wireless...