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Thanks for instructions. You're right, multimeter shows nothing when programmer off and when on. However screwdriver tester is showing 220 when on. Should I take the plunge on new programmer or is there a way to test by switching CH and HW wires to fool programmer and see if it's wiring or...

Just tried the workaround so connecting Brown wire for stat to live, and heating works when turning stat up. So would that confirm programmer needs changing? Thing that puzzles me is the wire from programmer is showing 220v on voltage tester (not multimeter as I'm not sure what I'm doing with...

Ok so multimeter at the ready and looking for advice! Tried fiddling around with the multimeter and learnt the hard way that I'm not sure how to test... Would appreciate any help from previous posters or anyone else.

I definitely appreciate your help!! The thing is, like i mentioned before, when I disconnected the yellow wire from the programmer, it measured mains voltage, but drops down when connected to the brown wire of the stat. I think I will take a rest Daniel. Will pick up a multimeter and get...

Yeah I am aware of the workaround but was looking to sort it properly myself. Wiring at the programmer seems fine. I should state that everything has been functioning fine for 2 years. The property is a refurb/new build. And all the wires look in good health, no splitting or anything.

so i did as suggested. Along all the points you suggested, the voltage tester showed 12 right the way through to the orange, but no heating. Not sure if 12v is right as when I connect it to live (220) it starts the motor, valve moves and boiler fires up, but i am a layman

ok thanks. so my tester shows the yellow wire from the programmer as 220v when disconnected. when connected to the brown wire of the stat, it shows nothing. Would appreciate any help without multimeter! But if no other option I will pick one up tomorrow.

ok. i dont have a multimeter. heating isnt working...

i tested on the terminals of the room stat using a screwdriver tester which shows voltage levels

So I have a mains voltage tester. When I apply it to terminal 1 on room stat and the stat is set to a low temp, it reads 12v, when turning up to max, it goes to nothing. There is no change on the other terminals as I turn the stat. Hope that helps?

Ok thanks. I think I understood (I went slow and double checked!) Here's what I have at the moment: And yes the two white cable on top right are going to programmer.

OK, so to be clear, switched live (term 3 on stat) should be leading to the junction box and connecting to white wire? or common neutral?

The wire includes 3 wires and an earth. But the old stat only had the two I have wired up so didnt use the 3rd (grey). That's next step?

Thanks for the reply. It's possible the pcb or switched have gone as the unit is about 18months old. But connecting the white wire to live solved the problem. Motor whirred up and moved the motorised valve and the boiler began warming the rads. There is an issue with the stat also. It's...

Hi, Here's my issue. HW is functioning as usual. CH however is not coming on. I have ensured the room thermostat is turned to max, and set the programmer to on. The only way I have managed to get radiators warm is to move the lever on the mid position valve to manual and switch on hot...