Compressor overcurrent interruption

What does UP mean?

Compressor overcurrent is detected after 30 seconds of compressor operation, indicating an excessive current draw. Potential causes include a closed stop valve, insufficient power supply voltage, incorrect compressor wiring, fan malfunctions, short cycling, or a defective compressor or outdoor controller board input circuit. This fault protects the compressor from immediate damage but requires prompt resolution to prevent component failure.

1. 1

   Ensure the stop valve of the outdoor unit is fully open.

2. 2

   Check the power supply facility for adequate and stable voltage.

3. 3

   Inspect compressor wiring (U·V·W phase) for looseness, disconnection, or incorrect polarity. Refer to Section 10-9.

4. 4

   Verify proper operation of indoor/outdoor fans and resolve any short cycling issues.

5. 5

   Check the compressor for proper operation. Refer to Section 10-6. Before replacing the outdoor controller board, disconnect compressor wiring and check U-V, V-W, W-U phase output voltages during test run; they should be equal at the same frequency.