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What does the red light indicate on the top of the 8870?

April 26, 2017indicate light red

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What does the red light indicate on the top of the 8870?

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You will notice the red led on the top of the thermostat blink on and off while the thermostat initializes. After initialization the red led is not normally illuminated. If you are using the model 8870 in a heat pump application the illumination of the red led would indicate that your auxiliary emergency heat has been turned on.