5.29 Inverter module Troubleshooting for three-phase models
5.29.1
Digital display output
5.29.2
Description
L0 indicates Inverter or compressor protection
L1 indicates DC bus low voltage protection
L2 indicates DC bus high voltage protection
L3 indicates current sampling error of PFC circuit
L4 indicates rotating stall protection
L5 indicates zero speed protection
L7 indicates phase loss protection of compressor
Heat pump stops running.
Specific error code L0, L1, L2, L3, L4, L5, L7 is displayed on the user interface and the refrigerant system PCB.
5.29.3
Possible causes
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.
Contactor stuck or 908 self checking fail.
The specific error codes can also be obtained from the LED indicators on the inverter module.
LED1 flashing pattern (RED)
Flashes 1 times and stops for 0.4s, then repeats
Flashes 2 times and stops for 0.4s, then repeats
Flashes 3 times and stops for 0.4s, then repeats
Flashes 3 times and stops for 0.4s, then repeats
Flashes 4 times and stops for 0.4s, then repeats
Flashes 5 times and stops for 0.4s, then repeats
Flashes 5 times and stops for 0.4s, then repeats
Flashes 6 times and stops for 0.4s, then repeats
78
L0 indicates Inverter or compressor protection
L0 indicates Inverter or compressor protection(overheated)
L1 indicates DC bus low voltage protection
L2 indicates DC bus high voltage protection
L3 indicates current sampling error of PFC circuit
L4 indicates rotating stall protection
L5 indicates zero speed protection
L7 indicates phase loss protection of compressor
Corresponding error