TROUBLESHOOTING
92
L0, L1, L2, L4, L5, L8, L9 - THREE-PHASE units
Description
• Inverter module protection
• The unit shuts down.
• Specific error code L0, L1, L2, L4, L5, L7, L8 or L9 is displayed on the main PCB
Possible causes
• Inverter module protection
• DC bus low or high voltage protection.
• MCE error (Bus low or high voltage protection or overcurrent protection **)
• Zero speed protection.
• Phase sequence error.
• Excessive compressor frequency variation.
• High pressure protector
• Contactor blocked or auto-diagnostic error 908
Specific error codes for inverter module protection
Error code Description
L0 inverter module protection
L1 DC bus low voltage protection
L2 DC bus high voltage protection
L4 MCE error (**)
L5 zero speed protection
L8 compressor frequency variation greater than 15 Hz within one second protection
L9 current compressor frequency diers from set frequency by more than 15 Hz protection
The specific error codes can also be obtained from the LED indicators on the inverter module.
LED1/LED2 flashing pattern Corresponding error
Flashes 8 times and stops for 1 second, then resumes. L0 - inverter module protection
Flashes 9 times and stops for 1 second, then resumes L1 - DC bus under-voltage protection
Flashes 10 times and stops for 1 second, then resumes. L2 - DC bus overvoltage protection
Flashes 12 times and stops for 1 second, then resumes. L4 - MCE error
Flashes 13 times and stops for 1 second, then resumes. L5 - zero speed protection L5
Flashes 17 times and stops for 1 second, then resumes
L8 - compressor frequency variation greater than 15 Hz
within one second protection
L9 - current compressor frequency diers from set
frequency by more than 15 Hz protection
L8 - compressor frequency variation greater than 15 Hz
within one second protection
Flashes 3 times and stops for 1 second, then resumes. bH - Contactor blocked or auto-diagnostic error 908.
Flashes 3 times and stops for 1 second, then resumes. P1 - high pressure protector
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