Derek ColeGM, Simmons One Hour Heating & Air · AI HVAC Answers

Understanding AUX Mode: What That Red Light Means

9 Jan 2025 · 0 min

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0:23

A short transcript snippet explaining thermostat 'AUX' mode: a red or flashing aux light indicates the auxiliary electric heat strips are active. The speaker says this is normal and serves as a backup to assist a heat pump when outdoor temperatures fall (around or below 40°F).

Questions this video answers

Around or below 40°F.

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