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[Defective outdoor unit heat exchanger thermistor]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Temperature (°C)
15
10
5
010 304020 50
5kΩ at 25°C
Is the outdoor
unit heat exchanger
thermistor connector
OK?
Repair
NO
YES
NO
YES
Are the outdoor unit
heat exchanger thermistor
characteristics OK, is there
any broken wire?
Defective outdoor unit
heat exchanger
thermistor Replacement
Defective outdoor unit control
PCB Replacement (Defective
outdoor unit heat exchanger
thermistor input circuit)
Outdoor unit heat exchanger
thermistor (Th
O-
R)
Resistance temperature characteristics
Resistance
(k
Ω
)
Error display :
e37
● Display conditions
If the temperature sensed by the thermistor is –30ºC or lower con-
tinuously for 5 seconds between 2 minutes and 2 minutes 20 seconds
after the compressor goes ON, the compressor stops. After a 3 minute
delay, the compressor restarts. If this state is detected 3 times in 40
(60) minutes.
Is the
discharge pipe ther-
mistror characteristics
normal?
YES
NO
NO
NO
Discharge pipe thermis-
tor replacement
Defective outdoor unit PCB
Replacement
Is the unit
normalized
Discharge
temperature error?
(At cooling/heating
operation)
Is discharge temperature
control normal?
Abnormal temperature sensed
Is the (actual measurement) normal?
Check the unit side.
Check the unit side.
Insufficient refrigerant
Charge the refrigerant (measure)
Is it the oveload operation?
During cooling: Is FM
0
operating?
During heating: Is FM
1
operating?
Are service valves (both liquid,
gas) fully opened during both
cooling and heating.
Is the installation space of indoor/
outdoor unit adequate?
Is there any short circuit air flow
for indoor/outdoor units?
If the discharge pipe temperature exceeds the set value,
the compressor’s speed (151~251) or the expansion
valve’s opening angle (301~601) is controlled to prevent
the discharge pipe temperature from rising.
The compressor’s capacity
is lowered (Each minute the
speed is reduced (151~251).
Expansion valve control
(301~601)
Hold
Discharge pipe temperature (°C)
Temperature [T] (°C) Temperature [T] (°C)
151~251 type
Compressor control
80 90
Discharge pipe temp. (°C) Discharge pipe temp. (°C)
80 121
100
301~601 type
90
Release
Operoble Operoble
Error stop Error stop
100
50
0
10
5
0
0 50 80 100
151~251 type 301~601 type
● 151~251 type
● 301~601 type
140120100806040200
0
100
50
Thermistor resistance
(kΩ)
[T
>
80°C]
Thermistor resistance
(kΩ)
[T
<
80°C]
Thermistor resistance
Temperature-resistance characteristics
of discharge pipe thermistor (Tho-D)
Temperature-resistance characteristics
of discharge pipe thermistor (Tho-D)
80 105
Abnormal Temperature Detection
T
>
80˚C
T
<
80˚C
6
[Discharge temperature error]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Error display :
e36
● Display conditions
If the discharge temperature is as shown at left 2 (5) times within 60
minutes, or continuously for 60 minutes, including when the com-
pressor is stopped.
Note (1) Values in ( ) show for the case of the 301~601 models.
Note (1) Values in ( ) show for the case of the 301~601 models.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.
Note (1) The green LED in the outdoor unit is used in the FDCA301 ~ 601 models only.