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Thanks Peter

That would make sense but mine is happening when all the HR80 are set to 5C i.e. off.

I think it will have to be a long journey of trial an error to see which HR80 is sending...

Hi Peter et all.

I have recently installed a CM Zone system - well actually two kits put together. I have 12 HR80 in 3 zones, a HC60NG boiler relay and a HRC0NG zone valve relay and two CM67zs. ...