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Causes & Recommended Solutions

The U4 error code indicates a failure in the transmission between the indoor and outdoor units. This issue may affect system communication, leading to inefficient operation.

Common Causes of the U4 Error Code

Communication Cable Issues

Faulty PCB Connections

Interference in Transmission

Recommended Solutions

Inspect Communication Cables for Damage

Check the PCB for Malfunctions

Ensure Proper Connection Between Indoor and Outdoor Units

Need Expert Help?

Call Skycon Air Conditioning!

If the communication issue continues, Skycon Air Conditioning can resolve the problem and restore system operation.
1300 264 424
1300 264 424