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

AUX or EM Heat is Flashing on Thermostat

28 Jan 2026 · 0 min

Episode

28 Jan 2026 · 0 min

0:00

When your thermostat shows AUX or EM with a flashing red light, your heat pump's backup heating strips have kicked in. This happens automatically when it gets cold outside, usually around 40°F or below, and is completely normal.

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