How to Replace a Honeywell 2 Wire Thermostat | Hunker
If you have only two wires in your heating or cooling system, there is no thermostat blue wire, or common wire, to power the thermostat. You need a battery powered or mechanical model. To avoid confusion with thermostat wire colors, label the wires before removing them from the old thermostat.anneliese garrison
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2wire thermostat wiring diagram heat Gallery
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