E1 n 85 (FJM Indoor) — Cable miss-wiring

What does E1 n 85 mean?

The FJM indoor unit displays E1 n 85, indicating that the communication or power cables between the indoor and outdoor units are incorrectly wired. This prevents proper system operation.

• Incorrect cable connection between indoor and outdoor units
• Damaged wiring

Click steps to track your progress.

1. 1

   Turn off the main power to both the FJM indoor and outdoor units at the circuit breaker immediately.

2. 2

   Carefully check all cable connections between the indoor and outdoor units against the system's wiring diagram.

3. 3

   Ensure all wires are securely fastened to the correct terminals.

4. 4

   Restore power and restart the system. If the issue remains, contact a qualified technician.