E51 - Inverter PCB fault or power transistor overheat

What does E51 mean?

There is a fault with the inverter PCB itself, or the power transistor on the inverter board has overheated. Both indicate a serious internal electronic issue.

• Malfunctioning inverter Printed Circuit Board (PCB).
• Overheating of the inverter power transistor due to load or ventilation issues.
• Internal component failure on the inverter board.

Click steps to track your progress.

1. 1

   Turn off the air conditioning unit at the main power supply.

2. 2

   Wait for at least 30 minutes for the unit to cool down completely.

3. 3

   Restore power and restart the unit.

4. 4

   If the error persists, contact a qualified service technician, as this likely requires board replacement.