Current Sensor Error / Outdoor Fan Motor Anomaly

What does U8 (00) mean?

This code indicates either an abnormal current detection by the current sensor (-1.5A to 1.5A) during compressor operation, or an abnormal rotational frequency of the outdoor fan motor. Fan motor abnormality occurs if rotation is below 100 rpm for 1 second at >=20°C ambient temperature, or below 80 rpm / above 1300 rpm continuously for 1 minute. Potential root causes include incorrect compressor wiring, a defective current sensor circuit on the outdoor power circuit board, DC fan motor failure, or an issue with the outdoor circuit controller board.

• Current sensor fault or anomaly detected (U8 code).
• Outdoor fan motor operating outside expected parameters or has an internal fault.
• Interference or signal loss from the outdoor fan motor control.
• Possible issue with the outdoor fan motor's speed or direction feedback.

Click steps to track your progress.

1. 1

   Correct the U·V·W phase wiring to the compressor. Refer to section 10-9 for the Outdoor power circuit board.

2. 2

   Check or replace the DC fan motor.

3. 3

   Check the voltage of the outdoor circuit controller board during operation.

4. 4

   Replace the outdoor power circuit board if the current sensor issue persists after verifying wiring.

5. 5

   Replace the outdoor circuit controller board if the fan motor failure persists after checking/replacing the motor.