LG Inverter AC showing CH05 error

I have two LG dual inverter AC units at home. All of a sudden, one day, one of the units started showing an CH-05 error code on the LCD display of the indoor unit. Upon displaying CH05, the AC blower stopped working and the compressor unit stopped working. Upon investigating the service manual, I found that this error is related to the communication between the indoor and outdoor units. Upon further investigation, it seemed to have come down to a connection with improper voltage levels at the input.

I went and investigated the MCB at the house and found that the AC unit is running in the same phase on the three phase power supply as other heavy equipment and this could be a reason. I switched the AC unit to a different phase and voila it solved the error message and the AC unit started working normal again.

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