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Hi All. @oldbutnotdead... did you ever confirm the cause of your issue? Cheers

Thank you both for the responses. Ianmcd, yep I had tried this. It's similar to the situation with the radiators... the outlet side for the upstairs zone is very warm when downstairs is on. But downstairs outlet side is scolding hot. The other way round, downstairs is stone cold when upstairs...

Sorry to bump this... but any thoughts anyone?

Hi All, I have recently had a new smart thermostat fitted but since then I'm having an issue with my separate heating zones. When the upstairs thermostat calls for heat, only the upstairs radiators come on as they should. But when the downstairs thermostat calls for heat, both the downstairs...