My heating is sometimes very hot then other times just warm with just the heating selected and my new zone valve open to the heating circuit. My room stat is calling for the heating to be on too. i've bled my radiators and there ok, any ideals

Paul Churchill, February 2018

All we know about your heating system is it's an unknown make, with an unknown type of boiler, in an unknown configuration with next to unknown controls.

Doesn't give anyone much to go on.

Not a clairvoyant, February 2018