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My Thermostat Auxiliary Light is On

When the auxiliary light on your thermostat turns on, it’s likely your heat pump isn’t working efficiently.

Why Is My Thermostat Auxiliary Light On?

Auxiliary heat is an automated system that cycles the backup heating system on and off to supplement your heat pump when it can’t reach the set temperature. If it turns on, there may be an issue with the control board on your heat pump.

Potential Issues

  • Auxiliary heat light is on
  • HVAC unit is shut off
  • heating unit won't turn on
  • air conditioner won’t turn on

The control board is crucial for your comfort at home. The board (or panel) has a lot of responsibility, including turning your system on and off, processing system commands, and letting you know when there's an issue. If the control board fails, your entire HVAC system will shut down because the entire system relies on it. A malfunction in the control panel could be a result of faulty wiring, a loss of electrical power to the system, or a burnout of the control board itself. If your HVAC system is not working properly (you notice things like poor airflow or inconsistent temperatures), check the control board. When it malfunctions, you’ll see the panel light up with LED lights, or you might find burnt spots on the board. These are signs that it’s time for a decision to repair or replace the equipment.


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