E4 60 (FJM Outdoor) — Communication cable mismatched between indoor and outdoor unit

What does E4 60 mean?

The FJM outdoor unit displays E4 60 when the communication cable between the indoor and outdoor units is either incorrectly wired or mismatched, disrupting essential data flow.

• Incorrect electrical connection of the communication cable
• Damaged communication cable
• Improper wiring terminals used

Click steps to track your progress.

1. 1

   Turn off the main power to the entire FJM system at the circuit breaker.

2. 2

   Carefully inspect the communication cable connections between the indoor and outdoor units.

3. 3

   Ensure the wiring matches the installation diagram and is securely terminated at both ends.

4. 4

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