Outdoor Unit LED 18 Flashes — Inverter error

What does 18 Flashes (Outdoor Unit) mean?

The LED on the outdoor unit flashes 18 times. This indicates a serious and persistent error with the inverter component in the outdoor unit, which controls the compressor speed, leading to system stoppage.

• Faulty inverter board or components.
• Power supply issues affecting the inverter.
• Overload or short circuit conditions in the compressor circuit.
• Malfunctioning compressor.

Click steps to track your progress.

1. 1

   Turn off the heat pump system at the main power supply, wait for at least one minute, then restore power.

2. 2

   Check for any external conditions that might be overloading the system, such as a blocked outdoor unit.

3. 3

   Ensure stable power supply to the outdoor unit, free from fluctuations.

4. 4

   If the issue reoccurs, contact a qualified technician as this often points to a serious internal electrical fault requiring professional diagnosis and repair or replacement of the inverter board.