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STEP 1
If your heat is not working.
Are your heating wires identified, labeled, and connected correctly?
RH, R, and W
There is no standard color code. Some of the wires may have the same color as the letter (like R or RH is often red and W is often white) but do not count on the color. The labels on the wires should be the same letters as where they were connected on the old thermostat.
If you cannot determine the letters from the old thermostat, go to the furnace unit and try to identify the wires that go to the thermostat location as the terminals at the furnace are usually labeled. Be sure the power to the furnace is shut off.
If you cannot accurately identify the wires letters, do not guess, call your local HVAC service dealer.
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