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Thanks for the help guys, it appears to be working well. I've just left the old timer intact and it doesn't seem to be having an effect on the new thermostat operation :D

Thanks mate, that looks ideal but it doesn't seem to list the CM921! I got it off ebay so i'm not sure how old a model it is.

Just looked at the boiler, all it is says is 28CDI RSF Combi. I think it's about 6 years old but I've only been in the house a year. Just don't want to try anything without some good advice incase I blow something. Cheers.

That's still over my head! I think I'm certainly a step by step person. On the Receiver I have ; N,L,L,A,B,C,D,E On the boiler there is the Red,Green,Blue. Receiver instructions say N - N, L - L2, T1 - A, T2 - B. Thanks

Hi, Tearing my hair out here over something probably very simple! I currently have a Worcester Bosch 28cdi combi boiler which has no remote thermostat. I therefore purchased the Honeywell CM927/921 wireless thermostat. Has anyone had any experience of fitting this? Do I just remove the...