Outdoor Unit LED 20 Flashes — Low pressure abnormal

What does 20 Flashes (Outdoor Unit) mean?

The LED on the outdoor unit flashes 20 times. This indicates an abnormally low pressure condition in the system, potentially causing the unit to stop operating.

• Insufficient refrigerant charge (leakage).
• Blockage or restriction in the refrigerant line.
• Faulty low-pressure sensor or switch.
• Outdoor unit operating in extremely cold temperatures without proper protection.

Click steps to track your progress.

1. 1

   Power cycle the heat pump system by turning off the main breaker for 60 seconds and then restoring power.

2. 2

   Check the outdoor unit for signs of ice formation on refrigerant lines, which could indicate low refrigerant.

3. 3

   Ensure the outdoor unit is free from obstructions and has proper airflow.

4. 4

   If the error persists, contact a qualified technician to check refrigerant levels and diagnose the low-pressure circuit.