Honeywell T40 two wire replacement

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cheddarpig
cheddarpig ✭
in General Questions & Topics
I’ve got an old Honeywell t40 thermostat that only has two wires connected.

Brown wire connected to 1 and blue connect to 2.

I’ve bought the Tado wired version but I’m unsure if the connections as the app doesn’t have a guide for them.

Can anyone advise where I should connect these two wires, please?

Answers

  • cheddarpig
    cheddarpig ✭
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    image.jpg
    IMG_0748.jpg

    Here is the current thermostat.

  • MartinInSuffolk
    MartinInSuffolk ✭
    edited January 31
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    I believe the blue wire should be connected to the terminal marked 'NO' (Normally Open) and the brown wire to the COM (common). That's how I wired mine, and it seems to work well.

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