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Thanks for that, to be honest that is one of the ways i had it wired so not sure what is happening. The new room stat is wired as your instruction but now the box in the airing cupboard seems to be playing up, the screen is normally lit with a green light showing the display, now no light...

Hi i had an old honeywell theromsat, i have just brought the Siemens RHD10 but can't seem to get the unit to work.... Old honewell had the following: Blue wire in 2 Red wire in 1 Yellow wire in 3 I have tried a number of ways to wire the new stat in but nothing seems to work. I now...