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HW fine. Boiler fine. CH not! Two separate valves; both motorised and working. There is no balancer valve... Stats working and controller working. Forced system to pump hot water around CH; removed motors from valves, manually selected CH with no H, forced both thermostats to power pump...

I've just replaced the safety valve on my Myson Orion and I think that I now have an air lock. I've bled all of the radiators: most fine, one above the boiler had lots of air. The hot water works fine, but the radiator circuit does not seem to circulate? I've put a thermometer on the spur and...