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Changing from thermostat to Honeywell.. Have ABCD green/yellow/white

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What kind of thermostat is this? 3 wires yellow, black, red

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Old Rheem Thermostat Wiring Diagram - Wiring Diagram

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Thermostat Wiring Color Code [Decoded and Explained] - YouTube

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Thermostat Wiring Red White Green Blue - Honeywell RTH8500 Wiring help