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4.20 Inverter module Troubleshooting for single-phase models
Digital display output 4.20.1
Description 4.20.2

Inverter module protection.

Split stops running.

Specific error code L0, L1, L2, L4, L5, L8, L9 is displayed on the user interface and the main control board of
refrigerant
system.
Possible causes 4.20.3

Inverter module protection.

DC bus low or high voltage protection.

MCE error(DC bus low or high voltage protection or software over current protection)

Zero speed protection.

Excessive compressor frequency variation.

Actual compressor frequency differs from target frequency.

High pressure protection.

PED board self checking fail.
Specific error codes for inverter module protection 4.20.4
Table 4-4.1: Specific error codes
Specific error code Content
L0 Inverter module protection
L1 DC bus low voltage protection
L2 DC bus high voltage protection
L4 MCE error(DC bus low or high voltage protection or software over current protection)
L5 Zero speed protection
L8 Compressor frequency variation greater than 15Hz within 1 second protection
L9 Actual compressor frequency differs from target frequency by more than 15Hz protection
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The specific error codes can also be obtained from the LED indicators on the inverter module.
Table 4-4.2: Errors indicated on LED, single-phase 4~10kW
LED301 flashing pattern (GREEN)
LED302 is always on (RED)
Corresponding error
Flashes 8 times and stops for 1 second, then repeats L0 - Inverter module protection
Flashes 9 times and stops for 1 second, then repeats L1 - DC bus low voltage protection
Flashes 10 times and stops for 1 second, then repeats L2 - DC bus high voltage protection
Flashes 12 times and stops for 1 second, then repeats L4 - MCE error
Flashes 13 times and stops for 1 second, then repeats L5 - Zero speed protection
Flashes 16 times and stops for 1 second, then repeats L8 - Compressor frequency variation greater than 15Hz within one second protection
Flashes 17 times and stops for 1 second, then repeats
L9 - Actual compressor frequency differs from target frequency by more than 15Hz
protection
Table 4-4.3: Errors indicated on LED, single-phase 4~10kW
LED1 flashing pattern (GREEN)
LED2 is always on (RED)
Corresponding error
Flashes 3 times and stops for 1 second, then repeats P1 - High pressure protection
Flashes 5 times and stops for 1 second, then repeats bH – PED board checking fail
Flashes 8 times and stops for 1 second, then repeats L0 - Inverter module protection
Flashes 9 times and stops for 1 second, then repeats L1 - DC bus low voltage protection
Flashes 10 times and stops for 1 second, then repeats L2 - DC bus high voltage protection
Flashes 12 times and stops for 1 second, then repeats L4 - MCE error
Flashes 13 times and stops for 1 second, then repeats L5 - Zero speed protection
Flashes 16 times and stops for 1 second, then repeats L8 - Compressor frequency variation greater than 15Hz within one second protection
Flashes 17 times and stops for 1 second, then repeats
L9 - Actual compressor frequency differs from target frequency by more than 15Hz
protection
Figure 4-4.1: LED location of inverter module
Inverter Module(4-10KW): LED301/302/303 Inverter Module(12-16KW): LED1/LED2/LED3
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