Lennox · EL18KSLV Series Outdoor Units
The compressor motor is out of sync. This can be caused by overload, fluctuating loads, issues with the current sensor circuit, or a missing inverter gate drive signal.
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Verify the power supply voltage is normal.
Ensure the wiring between the power module and compressor is correct.
Check if the power module is functioning normally.
Confirm the compressor is normal (check coil resistance and insulation).
If the compressor load is too high, find and resolve the reason.