MrCool DIY-MULTI2-18HP230C, Service Manual

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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 diagnosis and solution) ...47
8.15 (IDU)PC 03/(ODU)PC 31 (Low pressure protection diagnosis and solution .....49
8.16 EC 72 (Lack phase failure of outdoor DC fan motor diagnosis and solution) .51
8.17 PC 43 (Outdoor compressor lack phase protection diagnosis 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) diagnosis and solution) ...
53
9. Check Procedures .................................................................................................54
Troubleshooting