E1 n 01 (FJM Indoor) — Communication error (unable to receive data)

What does E1 n 01 mean?

The FJM indoor unit displays E1 n 01 (where 'n' is an indoor unit identifier), indicating it cannot receive data. This points to a problem with the communication link to the rest of the system.

• Loose or incorrect communication cable connection to the indoor unit
• Damaged communication cable
• Faulty indoor unit PCB

Click steps to track your progress.

1. 1

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

2. 2

   Carefully check the communication cable connection to the indoor unit for secure fastening and correct wiring.

3. 3

   Wait for 30 seconds, then restore power.

4. 4

   If the error persists, contact a qualified technician to inspect the wiring and the indoor unit's PCB.