4-time blink 2.5 seconds OFF — Frequency drop by defrosting in COOL mode / discharge temperature protection (Outdoor unit operates)

What does 4-time blink 2.5 seconds OFF (Outdoor unit operates) mean?

The outdoor unit LED blinks 4 times with a 2.5-second pause, and the unit is still operating. This indicates the compressor frequency has lowered because the indoor coil thermistor read 8°C or less in COOL mode (defrosting), or the discharge temperature thermistor exceeded 111°C (discharge temperature protection).

• Indoor coil freezing in COOL mode
• Discharge temperature thermistor exceeding 111°C
• Refrigerant circuit issue
• Incorrect refrigerant amount
• LEV (Linear Expansion Valve) malfunction
• Outdoor thermistor malfunction

Click steps to track your progress.

1. 1

   Ensure the indoor unit's air filters are clean to prevent freezing.

2. 2

   Check for any obstructions around the outdoor unit that might affect heat dissipation.

3. 3

   If the issue persists, a qualified technician should check the refrigerant circuit, refrigerant amount, and thermistors.