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Error Code
The U3 error code signals an abnormal operation during initial power-on, often due to communication or configuration problems between indoor and outdoor units.
A recent power outage or restart may require a full reset.
Improper connections between the indoor and outdoor units.
The system may have failed to complete the initialization process properly.
Turn off the system completely, wait a few minutes, and restart.
Check all wiring, dip switches, and address settings for accuracy.
Reinitialize or reprogram the system if addressing was incorrect.
