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STEP 5
If your fan switch is not working.
Do you have a fan wire and is it connected?
The Fan wire should be labeled G.
Is your G-wire identified, labeled, and connected correctly?
Does that wire connect to the fan unit?
There is no color code. Some of the wires may have the same color as the letter (like G is often green) but do not count on the color. The label on the fan wire should be the same letter as where it was connected on the old thermostat.
If you cannot determine the fan letter from the old thermostat, go to the HVAC site and try to identify the wires that goes to the thermostat as they are usually labeled. Be sure the power to your HVAC system is shut off.
If you cannot accurately identify the wires letters, do not guess, call your local HVAC service dealer.
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