Honeywell Wire Diagram. The old thermostat has 3 wires. Make sure all connections are good and all terminal screws are firmly tightened.
If the wire labels from your old thermostat hookup dont match the above honeywell offers additional advice that we adapt in table form provided in detail. S indoor and outdoor wired sensors y compressor stage 1 cooling y2 compressor stage 2 cooling g fan c common u humidifier dehumidifier or ventilator control la a input for heat pump fault ob reversing valve for heat pump systems e emergency heat. If you check the honeywell thermostat ct31a1003 wiring diagram youll see that it requires only two wires because its a very basic thermostat designed only to control a heating system.
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2 wire thermostat which model is the right choice. A full load all wiring must comply with local electrical codes and ordinances. With all the assist of this e book you are able to very easily do your personal wiring projects. One of those tips are illustrated with practical illustrations.