LG multi V 4 AC with error 52« Back to Previous Page

Dear Admin, I have a very strange problem with my LG multi V 4 AC with error 52 on the outdoor unit slave 3.I’ve tried swapping all PCB board spare parts including jumper cables, between slave 2 (good condition) and salve 3 (error 25)The result is still error 52 on the slave 3 unit if all the PCBs and jumper cables are installed in the slave 3 unit. Meanwhile, all the PCBs and jumper cables coming from slave 3 if installed on slave 2 the results are normalWhat else should I check? Or what is the possible cause of error 52? I can confirm that none of the PCBs or jumper wires are damaged.Please help me. Thank alot