F4 (8 LED flashes) - Overheat protection for exhaust temperature

What does F4 mean?

The outdoor unit's LED1 flashes eight times, indicating that the exhaust temperature has exceeded safe limits, triggering an overheat protection.

• Insufficient airflow around the outdoor unit
• Dirty condenser coils blocking heat dissipation
• Low refrigerant charge
• Faulty exhaust temperature sensor

Click steps to track your progress.

1. 1

   Turn off the AC unit at the main power supply and allow it to cool down for at least 30 minutes.

2. 2

   Ensure the outdoor unit is free from obstructions like leaves, dirt, or debris that block airflow.

3. 3

   Carefully clean the outdoor unit's condenser coils using a garden hose (low pressure) if they appear dirty.

4. 4

   After cleaning and cooling, restart the unit. If the error returns, contact a technician.