U1 TROUBLESHOOTING STEPS:

1. Verify High Voltage:

   • Check the power supply for high voltage irregularities.

   • Ensure the voltage supplied to the compressor is within the specified range.

2. Examine the Compressor:

   • Inspect the compressor for any visible damage.

   • Verify the wiring and connections to the compressor.

   • Ensure the compressor is functioning correctly.

3. Check the Outdoor Board:

   • Inspect the outdoor board for signs of malfunction related to the compressor phase current detection circuit.

   • Confirm proper wiring and connections on the outdoor board.

   • Check for any visible damage or anomalies on the outdoor board.