Transmission Error / Loose Connection (Cal)

What does E45 mean?

A transmission error has occurred between the inverter and the outdoor unit PCB, possibly due to a loose connection at the 'Cal' terminal. This disrupts critical communication and control signals.

• Communication error during the calibration (Cal) process.
• Loose or damaged communication cable (e.g., between indoor and outdoor units).
• Interference affecting data transmission.
• Faulty communication module on one of the units.
• Incorrect calibration parameters or sequence.

Click steps to track your progress.

1. 1

   Inspect the communication wiring between the inverter and outdoor unit PCB for secure connections.

2. 2

   Verify the connection at the 'Cal' terminal on the outdoor unit PCB, ensuring it is tight and corrosion-free.

3. 3

   Check for signs of damage or corrosion on the communication terminals themselves.