E45 - Transmission error between inverter and outdoor unit PCB or loose connection

What does E45 mean?

A transmission error has occurred between the inverter and the outdoor unit's Printed Circuit Board (PCB), or there is a loose connection at the "Cal" point. This affects communication between critical components.

• Communication cable fault between inverter and outdoor unit PCB.
• Loose connection at the "Cal" terminal.
• Faulty inverter or outdoor unit PCB.

Click steps to track your progress.

1. 1

   Turn off the air conditioning unit at the main circuit breaker.

2. 2

   Wait for 30 seconds to allow the system to reset.

3. 3

   Restore power and observe if the error clears.

4. 4

   If the error persists, contact a qualified service technician to inspect internal connections and boards.