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    mike2006's Avatar
    mike2006 Posts: 2, Reputation: 1
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    #1

    Oct 22, 2006, 01:32 PM
    Honeywell RTH230B - wiring
    I'm installing the rth230b on a 3 wire gas fired boiler. The wires are blue, red, white.
    On the old mercury stat the blue and red wre on the same post. Anybody know how I should wire this one? Thanks! Mike
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Oct 22, 2006, 02:32 PM
    Not sure what the blue does. If it worked connected to the red before, try both on the RH terminal and the white on the W.
    mike2006's Avatar
    mike2006 Posts: 2, Reputation: 1
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    #3

    Oct 24, 2006, 05:20 AM
    I tried that and it didn't start it. But, it actually worked the opposite. (go figure.. )
    Thanks for your help though. I appreciate it. I'm still having a hassle getting the program to run right, all the time. Strange to be inconsistent. But, so it goes for $30, I guess.
    Regards.
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