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D_Hailsham, thanks for all the advice, it has been extremely helpful. I have taken your advice and changed the L & N supplies over so that they come directly from the boiler's L & N. Cheers

I assume the cable must have been installed prior to the regulation change to standardise wire colouring (it was already here when I moved in). The cable has 3 wires - brown, black & grey. Grey was the only one free that's why I used it. I guess I should label each end with the appropriate info...

Thanks D_Hailsham for your prompt response. Luckily for me there was a 3 core (+earth) already there. There was an unused (grey) wire which was not connected at either end. I have used that to provide a neutral connection between the boiler and the cmt921. The connections I used (for my...

Hi experts I have just purchased a Honeywell CMT921 to replace my broken T6360B. I found a thread here http://www.diynot.com/forums/viewtopic.php?t=179838 with info on how to wire up the CM921. However, when I opened up the T6360B I found mine only has 2 wires (instead of 3 - as per the...

My professional opinion would have been to replace the ONE wife instead of FOUR fully working thermostats! ;)