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Indoor Unit Outdoor Unit CS-E24NKES CS-E28NKES CU-E24NKE ...

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15.5.21 F90 (Power Factor Correction Protection)<br />

Malfunction Decision Conditions<br />

� During startup and operation of cooling and heating, when Power Factor Correction (PFC) protection circuitry at<br />

the outdoor unit main PCB senses abnormal high DC voltage level.<br />

Malfunction Caused<br />

� DC voltage peak due to power supply surge.<br />

� DC voltage peak due to compressor windings not uniform.<br />

� Faulty outdoor PCB.<br />

Troubleshooting<br />

81

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