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Indoor Unit Diagnostic Guides
Table 18—Diagnostic Codes
Display LED STATUS IDU Error IDU Error
E0 Outdoor EEPROM malfunction F4 E6
E2 Communication malfunction between indoor and outdoor units E1 E2
E3 Communication malfunction between IPM board and outdoor main board —— ——
E4 Open or short circuit of outdoor temperature sensor (T3、T4、T5、T2B) F2 E6
E5 Voltage protection P1 P0
E6 PFC module protection —— ——
E8 Outdoor fan speed has been out of control(Only for DC fan motor models) F5 ——
E9 Wrong wiring connection of 24K indoor unit —— ——
F1 No A Indoor unit coil outlet temp. sensor or connector of sensor is defective —— ——
F2 No B Indoor unit coil outlet temp. sensor or connector of sensor is defective —— ——
F3 No C Indoor unit coil outlet temp. sensor or connector of sensor is defective —— ——
F4 No D Indoor unit coil outlet temp. sensor or connector of sensor is defective —— ——
F5 No E Indoor unit coil outlet temp. sensor or connector of sensor is defective —— ——
F6 No F Indoor unit coil outlet temp. sensor or connector of sensor is defective —— ——
P0 Temperature p rotection of compressor top P2 P3(P1)
P1 High pressure protection —— ——
P2 Low pressure prote ction —— ——
P3 Current protection of compressor —— ——(P2)
P4 Temperature protection of compressor discharge —— ——
P5 High temperature p rotection of condenser —— ——
P6 IPM module protection P0 E5
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