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Error Code
The U2 error code indicates a power supply issue, typically an abnormal power source or voltage drop. This can prevent the unit from starting or operating normally.
An unstable or insufficient power supply can trigger this error.
Loose or damaged wiring may cause inconsistent power delivery.
A malfunctioning indoor or outdoor power board may be failing to regulate voltage.
Ensure the unit is connected to a stable and appropriate power source.
Have a technician check for loose wires or faulty electrical components.
Test and replace the power PCB if necessary.
