C101 or C102 - Indoor to outdoor communication error

What does C101/C102 mean?

The indoor or outdoor unit displays C101 or C102, indicating a communication issue between the indoor and outdoor units. The outdoor display might show '1min. Time out Comm.' or 'Abnormal Communication'.

• Incorrectly connected communication cable
• Power cable and communication cable are crossed
• Faulty indoor unit main board (PBA)
• Faulty outdoor unit main board (PBA)

Click steps to track your progress.

1. 1

   Turn off the air conditioner at the main power supply and wait 5 minutes, then turn it back on.

2. 2

   Check that the communication cable between the indoor and outdoor units is securely and correctly connected.

3. 3

   Ensure that the power cable and communication cable are not crossed or touching each other.

4. 4

   If the error reappears, contact a qualified service technician.