Lennox · EL18KSLV Series Outdoor Units
The drive module has detected that the compressor failed to start. This could be due to power supply issues, wiring problems, a faulty power module, a bad compressor, or system overload.
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Ensure the electric box and compressor wiring are correct and firmly in place.
Confirm the compressor is normal (check coil resistance and insulation).
Check if the power module is normal.
If the compressor load is too high, find and resolve the reason.