Specifications

1079
FDC-HKXR
Is the outdoor
unit heat exchanger
hermistor connector
OK?
Repair
YES
NO
Are the outdoor
unit heat exchnger thermistor
characteristics OK, is there
any broken wire?
Defective outdoor unit
heat exchanger thermistor
→ Replacement
YES
NO
Is the outdoor
air temperature thermistor
connector connection
OK?
Repair
YES
NO
Is the outdoor
temperature thermistor
characteristics OK, is there
no broken wire?
Defective outdoor
temperature thermistor
→ Replacement
YES
NO
Defective outdoor unit PCB →
Replacement (Defective outdoor
unit heat exchanger thermistor
input circuit)
Defective outdoor unit PCB →
Replacement (Defective outdoor
temperature thermistor input
cicuit)
6
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
Red LED
Green LED
Keeps flashing
Keeps flashing
Indoor unit
Error display:
[Defective outdoor unit heat exchanger thermistor]
7
Red LED
Green LED
Stays OFF
Keeps flashing
Outdoor unit
Red LED
Green LED
Keeps flashing
Keeps flashing
Indoor unit
Error display:
[Defective outdoor temperature thermistor]
5k Ω at 25°C
Temperature (°C)
0
5
10
15
10 20 30 40 50
Resistance (kΩ)
Outdoor unit heat exchanger
thermistor (Th O- R) Resistance
temperature characteristics
Temperature [T] (°C)
-50 0 50
400
300
200
100
0
40
30
20
10
0
Thermistor resistance (kΩ) [T < 0°C] Thermistor resistance (kΩ) [T > 0°C]
Temperature-resistance
characteristics of outdoor
temperature thermistor (Th O- A)
T > 0°C
T < 0°C