30
300
400
200
100
0
30
40
20
10
0
–50
°
C
0
°
C
50
°
C
Temperature [T]
T < 0
°
C
T > 0
°
C
Is the outdoor
air temperature thermistor
connector connection
OK?
Repair
NO
NO
YES
YES
Is the outdoor
temperature thermistor
characteristics OK, is there
no broken wire?
Defective outdoor tempera-
ture thermistor
Replacement
Defective outdoor unit PCB
Replacement (Defective outdoor
temperature thermistor input
circuit)
Temperature-resistance
characteristics of outdoor
temperature thermistor (Th
O-
A)
Thermistor resistance
(k
Ω
)[T
<
0]
Thermistor resistance
(k
Ω
)[T
>
0]
=
=
=
=
7
Defective outdoor temperature thermistor
Outdoor unit
Red LED
Green LED
2 time flashes
1 time flash
Temperature [T]
T< 80
°
C
T> 80
°
C
100
50
0
10
5
0
0
°
C
50
°
C
20
°
C
80
°
C 100
°
C 120
°
C
Is the
discharge gas thermistor
connector connection
OK?
NO
YES
Repair
Are the discharge
gas thermistor characteristics
OK, is there no
broken wire?
Defective discharge gas
thermistor Replacement
NO
YES
Defective outdoor unit PCB
Replacement (Defective dis-
charge gas thermistor input
circuit)
Temperature-resistance
characteristics of discharge
gas thermistor (Th
O-
D)
Thermistor resistance
(k
Ω
)
[T
<
80
°
C]
Thermistor resistance
(k
Ω
)
[T
>
80
°
C]
8
Defective discharge gas thermistor (Only case of FDC(P)208~508 type)
Outdoor unit
Red LED
Green LED
3 time flashes
1 time flash
