L4 — High temperature at inverter circuit heatsink

What does L4 mean?

This code means the heatsink for the inverter circuit is experiencing high temperatures. This can affect the performance and lifespan of the inverter.

• Inadequate cooling of the inverter heatsink
• Overloaded inverter circuit
• Dust or debris on the heatsink

Click steps to track your progress.

1. 1

   Ensure the area around the outdoor unit has good airflow and is free of obstructions.

2. 2

   Clean any dust or debris from the heatsink if accessible and safe to do so.

3. 3

   Consult a technician if the high temperature persists, as the inverter may be failing.