Troubleshooting Guide

Contents
8.7 PC 01(Over voltage or too low voltage protection)/PC 10(Outdoor unit low
AC voltage protection)/PC 11(Outdoor unit main control board DC bus high
voltage protection)/PC 12(Outdoor unit main control board DC bus high
voltage protection /341 MCE error) Diagnosis and Solution......................38
8.8 PC40(Communication malfunction between IPM board and outdoor main
board diagnosis and solution) .....................................................................40
8.9 (ODU)PC 0F(PFC module protection diagnosis and solution) ...................41
8.10 (ODU)PC 06(Temperature protection of compressor discharge diagnosis
and solution)...............................................................................................42
8.11 (ODU)PC 0A(High temperature protection of condenser diagnosis
and solution)...............................................................................................43
8.12 EH 02 (Zero crossing detection error diagnosis and solution) ........................45
8.13 PC 02/(ODU)P0 (Top temperature protection of compressor diagnosis and
solution) ......................................................................................................46
8.14 (IDU)PC 03/(ODU)PC 30 (High pressure protection diag. and solution) .....47
8.15 (IDU)PC 03/(ODU)PC 31 (Low pressure protection diag. and solution) .....49
8.16 EC 72 (Lack phase failure of outdoor DC fan motor diag. and solution) .....51
8.17 PC 43 (Outdoor compressor lack phase protection diag. and solution) ........52
8.18 PC 45 (Outdoor unit IR chip drive failure diagnosis and solution) ..............53
8.19 (ODU)CE (Automatic correction of wiring/piping error) diag. and solution)
53
9. Check Procedures .................................................................................................54
Troubleshooting