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Thanks everyone. I’ll go have another play around.

Thanks transam. It was just the actuator. I followed the previous wiring - all the wires (blue, brown and orange) from all actuators were in the same terminals. Only separate one from the actuator was the grey. May be that the room stat live brown is not seated well/correctly in the terminal...

So I replaced the Danfoss HPA2 valve and now have heating upstairs again; however, this time it’s not being regulated by the thermostat. The heating is on when the programmer tells it but it is fully on for that duration with no regulation regardless of temperature set on thermostats. Anyone got...

So I replaced the Danfoss HPA2 valve and now have heating upstairs again; however, this time it’s not being regulated by the thermostat. The heating is on when the programmer tells it but it is fully on for that duration with no regulation regardless of temperature set on thermostats. Anyone got...

Awesome thanks for all the help. Much appreciated.

Had another play around - it appears it’s the valve that I can hear and feel resistance on when I move from auto to manual that is at fault. When it’s in auto there no heat upstairs, flip it to manual and I get heat! I guess that means the boiler could be on permanently if not in auto mode? The...

Thanks. I’ve moved the levers from auto to manual. I can feel resistance and hear the motor running on only one of them. I guess that’s the issue? thanks transam. I’ll disconnect the faulty one and have a closer look. Thanks again

Here’s a photo of the system.

E323B449-DFE4-4678-85B0-27D8DBCF181C by Rich Kellett posted 26 Mar 2021 at 4:28 PM

Hi transam. The upstairs wall thermostat clicks as it passes 19degrees. There are 2 white components in the airing cupboard pipework - they have a manual and auto setting via a lever on the top - are they zone valves? Thanks.

Zone valves??

Any help / guidance welcome - radiators upstairs (middle and top floor of house) cold but warm downstairs. Have recharged the system as pressure was zero. Also bled radiators upstairs - initially no water or air coming out of top floor ones but now water comes out but no heat. System has red...