E1 01 (FJM Outdoor) — Communication error (indoor unable to receive data)

What does E1 01 mean?

The FJM outdoor unit displays E1 01, indicating a communication error where one or more indoor units are unable to receive data from the outdoor unit. This prevents coordinated system operation.

• Loose or faulty electrical communication cable connection
• Incorrect communication settings
• Interference on the communication line

Click steps to track your progress.

1. 1

   Turn off the main power to the FJM outdoor unit and all connected indoor units at the circuit breaker.

2. 2

   Carefully check all electrical connections for the communication cable between the indoor and outdoor units.

3. 3

   Ensure all wiring is securely fastened to the correct terminals.

4. 4

   Restore power and attempt to restart the system. If the error persists, contact a qualified technician.