Klimaire KSIL024-H219 Service Manual - Manual (Page 57)

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9.2.8 Inverter compressor drive error diagnosis and solution
9.2.9 Zero crossing detection error
This is alarm signal when the main chip can’t detect over-zero signal. When such failure occurs, the
main control board must have fault.
Yes
Replace the outdoor PCB Replace inverter compressor.
Reconnect and retry
No
No
Is the connection of compressor good?
Is the wiring sequence right? The voltage
range proper?