C221 - Outdoor temperature sensor error

What does C221 mean?

The indoor unit displays C221, indicating a problem with the outdoor temperature sensor. The outdoor display might also show 'Outdoor temperature sensor error'.

• Outdoor temperature sensor not connected correctly
• Sensor is improperly placed
• Faulty sensor
• Faulty outdoor unit main board (PBA)

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main power supply.

2. 2

   Ensure the outdoor unit's temperature sensor is securely connected to its connector (CN251).

3. 3

   Verify the sensor is positioned correctly and not obstructed.

4. 4

   If the error persists, contact a service technician to check the sensor resistance or replace the outdoor PBA.