Thermostat Wiring Colors

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Honeywell Thermostat Function Codes

Thermostat wiring colors code [hvac wire color details] Thermostat wiring diagram letters mean wire wires those terminals 2wire which only where thermostats ifixit letter different connected goes Fridge thermostat wiring 4 6 3

Can't figure this 3 wire system out or find anything in postal about it

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