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    miki1043's Avatar
    miki1043 Posts: 2, Reputation: 1
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    #1

    Jun 21, 2010, 07:48 PM
    bay28x139 to honeywell rth110b
    My old thermostat has 8 wires and the honeywell rth110b only has 5 wires..
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Jun 21, 2010, 08:13 PM
    The honeywell rth110b looks like its for 1H/1C meaning one heat/one cool system, if you are using 8 wires this probably means you have a heatpump and furnace for backup heat, so you have the wrong tstat if this is correct
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