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== Two Stage Gas ==W – When you see a W terminal, it just means heat. Usually, you will only see W when the control only has one stage of heat.W1 – Means first-stage heat.W2 – Means second-stage heat.R (usually the red wire) is the power supply (24v). G (usually green) controls the fan.== resources ==* https://learnmetrics.com/thermostat-wiring/