Didn't work initially so had to get the multimeter out to see what was going on. Turns out my old mechanical thermostate needed to be replaced with a link in the boiler connector. Had a thought it was someting like this but took ages to find info to confirm it. PLEASE do not attempt this if you are not experienced as this is at 240VAC which can kill you. Get an expert. I'm an electronics engineer.
Anyway, that sorted, works as expected.
Item as described and arrived in good time via DPD. Item was bought to replace British Gas Hive unit installed to Worcester Bosch boiler which wasn't
Item as described and arrived in good time via DPD. Item was bought to replace British Gas Hive unit installed to Worcester Bosch boiler which wasn't functioning properly.