E4 16 (FJM Outdoor) — Outdoor unit high discharge temperature (safety control)

What does E4 16 mean?

The FJM outdoor unit displays E4 16 when it detects an excessively high compressor discharge temperature, causing the system to stop as a safety measure. This is critical for compressor longevity.

• Incorrect pipe length
• Refrigerant leakage or incorrect refrigerant charge
• Restricted airflow or dirty coils in indoor or outdoor units

Click steps to track your progress.

1. 1

   Ensure the outdoor unit's condenser coils are clean and not blocked by debris.

2. 2

   Check the air filters in all indoor units and clean them if necessary to ensure good airflow.

3. 3

   Turn off the main power to the FJM outdoor unit at the circuit breaker for 30 minutes to allow it to cool down.

4. 4

   Restore power and attempt to restart the system. If the problem persists, a qualified technician needs to check pipe lengths and refrigerant levels.