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Thread: help to wire programmable room thermostat

  1. #1
    Automated Home Lurker
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    Jan 2006
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    Default help to wire programmable room thermostat

    Help needed
    I have just bought a Honeywell cm67 programmable thermostat to replace an ancient Sunline Proscon and give me more control, problem is the Sunline has four wires Red (L), Blue(N) and Yellow + earth and the Honeywell has only two terminals, i have fitted the L & N as per the diagram but this just blows the fuse, can anyone help by telling me what i need to do with it to stop it blowing fuse's??

  2. #2
    Automated Home Lurker
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    Jan 2006
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    Default Re: help to wire programmable room thermostat

    The CM67 is battery powered it is only used to switch the boiler, I would be pretty certain that you only connect the red & the yellow.
    Red = Live
    Yellow = Switched live to boiler

  3. #3
    Automated Home Lurker
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    Jan 2006
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    Default Re: help to wire programmable room thermostat

    Thanks for your help on this one, you were spot on , it's working fine.
    Firts time that i have used this site!
    Thanks for the advice.

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