Troubleshooting SiMT041509E
53 Service Diagnosis
4. Troubleshooting
4.1 Error Codes and Description
: Displayed only when system-down occurs.
Error Codes Description
Reference
Page
System
00
Normal —
U2
Low-voltage detection or over-voltage detection 59
U4
Signal transmission error (between indoor unit and outdoor unit) 61
UA
Unspecified voltage (between indoor unit and outdoor unit) 63
Indoor
Unit
A1
Indoor unit PCB abnormality 54
A5
Freeze-up protection control / heating peak-cut control 55
A6
Fan motor (DC motor) or related abnormality 56
C4
Indoor heat exchanger thermistor or related abnormality 58
C9
Room temperature thermistor or related abnormality 58
Outdoor
Unit
E1
Outdoor unit PCB abnormality 64
E3
Actuation of high pressure switch 65
E5
OL activation (compressor overload) 66
E6
Compressor lock 68
E7
DC fan lock 69
E8
Input overcurrent detection 70
EA
Four way valve abnormality 71
F3
Discharge pipe temperature control 73
H0
Compressor system sensor abnormality 74
H6
Position sensor abnormality 75
H9
Outdoor temperature thermistor or related abnormality 77
J3
Discharge pipe thermistor or related abnormality 77
J6
Outdoor heat exchanger thermistor or related abnormality 77
L3
Electrical box temperature rise 79
L4
Radiation fin temperature rise 80
L5
Output overcurrent detection 81
P4
Radiation fin thermistor or related abnormality 77