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

Home Ac Thermostat Wiring

Can't figure this 3 wire system out or find anything in postal about it Thermostat wiring wire heat color diagram pump air nest guide common goodman colors honeywell code labels heater aruf handler wires

Goodman furnace thermostat wiring diagram Thermostat furnace wires terminals learnmetrics heat hvac w2 w1 y2 y1 goodman schemas

Goodman Furnace Thermostat Wiring Diagram - 18 Goodman Ac Wiring

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

Goodman Furnace Thermostat Wiring Diagram - 18 Goodman Ac Wiring
Goodman Furnace Thermostat Wiring Diagram - 18 Goodman Ac Wiring

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