SERVICE MANUAL - Inverter Pair Wall Mounted Type H-Series (DAIKIN)
Heat Pump
Indoor Units
FTXG09HVJU
FTXG12HVJU
FTXG15HVJU
Outdoor Units
RXG09HVJU
RXG12HVJU
RXG15HVJU
2. Troubleshooting
2.1 Error Code Indication by Remote Controller
* Various cases may be possible.
Code Unit Description Reference page
Basic Failure Diagnosis
Air conditioner does not run. 88
Air conditioner runs but does not get cooling (heating). 91
When operation starts, safety breaker trips. 93
Air conditioner makes a loud noise and vibrates. 95
A1 Indoor
Indoor unit PCB abnormality 96
A5 Peak-cut control or freeze-up protection 97
A6 Fan motor system abnormality 99
AH Streamer unit abnormality 101
C4 Indoor heat exchanger thermistor abnormality 103
C7 Front panel open / close abnormality 104
C9 Room temperature thermistor abnormality 103
CC Humidity sensor abnormality 105
E1 Outdoor
Outdoor unit PCB abnormality 109
E5 OL activation (compressor overload) 110
E6 Compressor lock 111
E7 DC fan lock 112
E8 Input overcurrent detection 113
EA Four-way valve abnormality 115
F3 Discharge pipe temperature control 117
F6 High pressure control in cooling 118
H0 Compressor sensor system abnormality 120
H6 Outdoor
Position sensor abnormality 121
H8 DC voltage / DC current sensor abnormality 123
H9 Outdoor air thermistor abnormality 124
J3 Discharge pipe thermistor abnormality 124
J6 Outdoor heat exchanger thermistor abnormality 124
L3 Abnormal temperature in electrical box 126
L4 Temperature rise in radiation fin 128
L5 Output overcurrent 130
P4 Radiation fin thermistor abnormality 124
U0 System
Insufficient gas 132
U2 Over voltage protection (OVP) / low voltage protection (LVP) 134
U4 Signal transmission error (indoor unit - outdoor unit) 106
Outdoor Outdoor unit PCB abnormality or communication circuit abnormality 135
U7 System
Signal transmission error on outdoor unit PCB 138
UA Incompatible power supply between indoor unit and outdoor unit 108 – System Lights-out of microcomputer status lamp 140
Heat Pump
Indoor Units
FTXG09HVJU
FTXG12HVJU
FTXG15HVJU
Outdoor Units
RXG09HVJU
RXG12HVJU
RXG15HVJU
2. Troubleshooting
2.1 Error Code Indication by Remote Controller
* Various cases may be possible.
Code Unit Description Reference page
Basic Failure Diagnosis
Air conditioner does not run. 88
Air conditioner runs but does not get cooling (heating). 91
When operation starts, safety breaker trips. 93
Air conditioner makes a loud noise and vibrates. 95
A1 Indoor
Indoor unit PCB abnormality 96
A5 Peak-cut control or freeze-up protection 97
A6 Fan motor system abnormality 99
AH Streamer unit abnormality 101
C4 Indoor heat exchanger thermistor abnormality 103
C7 Front panel open / close abnormality 104
C9 Room temperature thermistor abnormality 103
CC Humidity sensor abnormality 105
E1 Outdoor
Outdoor unit PCB abnormality 109
E5 OL activation (compressor overload) 110
E6 Compressor lock 111
E7 DC fan lock 112
E8 Input overcurrent detection 113
EA Four-way valve abnormality 115
F3 Discharge pipe temperature control 117
F6 High pressure control in cooling 118
H0 Compressor sensor system abnormality 120
H6 Outdoor
Position sensor abnormality 121
H8 DC voltage / DC current sensor abnormality 123
H9 Outdoor air thermistor abnormality 124
J3 Discharge pipe thermistor abnormality 124
J6 Outdoor heat exchanger thermistor abnormality 124
L3 Abnormal temperature in electrical box 126
L4 Temperature rise in radiation fin 128
L5 Output overcurrent 130
P4 Radiation fin thermistor abnormality 124
U0 System
Insufficient gas 132
U2 Over voltage protection (OVP) / low voltage protection (LVP) 134
U4 Signal transmission error (indoor unit - outdoor unit) 106
Outdoor Outdoor unit PCB abnormality or communication circuit abnormality 135
U7 System
Signal transmission error on outdoor unit PCB 138
UA Incompatible power supply between indoor unit and outdoor unit 108 – System Lights-out of microcomputer status lamp 140


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