Gree GRS-CQ6.0Pd/Na-K Service Manual page 122

AIR-TO-WATERHEATPUMP
3.1.4 Abnormal Noise of PFC Inductor
Generally, the continuous and minute sound of inductor is normal. Abnormal noise of
PFC inductor refers to discontinuous and obvious noise. The reasons may be:
PFC malfunction
abnormal output of driving
Fig.3.1.4 Flowchart of PFC inductor abnormal noise diagnosis
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