Error E49 / Outdoor Red LED Flashes Once — Low pressure, low voltage, or Inverter PCB fault

What does E49 / Outdoor Red LED 1 flash mean?

Error E49, indicated by one flash of the outdoor unit's red LED, signals either a low pressure fault, low voltage detected in the system, or a fault with the inverter PCB. All these can prevent proper operation.

• Low pressure fault
• Low voltage detected
• Inverter PCB fault

Click steps to track your progress.

1. 1

   Turn off the main power supply to the air conditioner for a few minutes and then restart it.

2. 2

   Check the main power supply for stable voltage output; power fluctuations can trigger this error.

3. 3

   If low pressure is suspected, this often indicates a refrigerant leak, which requires professional service.

4. 4

   An inverter PCB fault typically requires professional diagnosis and replacement.

5. 5

   Contact a qualified technician to inspect power, refrigerant, and the inverter PCB.