A9 - Malfunction of sensor system (unified) (Indoor Unit)

What does A9 mean?

This code points to a problem with one of the sensors within the indoor unit. This could be a temperature sensor or another type of sensor.

• Faulty sensor
• Loose sensor wiring
• Contamination on a sensor

Click steps to track your progress.

1. 1

   Turn off the power to the unit.

2. 2

   Ensure the area around the indoor unit's sensors is clean and free of debris.

3. 3

   Power the unit back on.

4. 4

   If the error code returns, a technician should inspect the sensors.