-
275
-
6
[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
Is the outdoor
unit heat exchanger
thermistor connected
correctly?
Correct it
NO
YES
NO
YES
Are the outdoor unit
heat exchanger thermistor
characteristics OK?
The outdoor unit heat exchanger
thermistor is defective.
Replace it.
The outdoor unit control
PCB is defective
Replace it.
5
10
15
0
20
40
60
80
100
Outdoor unit heat exchanger
thermistor(Tho-R)
Resistance-temperature characteristics
Temperature (ºC)
Thermistor resistance (k
Ω)
Error display :
E37
Display conditions
If the temperature sensed by the thermistor is –50 (–30)ºC or
lower continuously for 5 seconds between 2 minutes and 2 min-
utes 20 seconds after the compressor goes ON, the compressor
stops. After a 3 minute delay, the compressor restarts.
The error occurs when this state is detected 3 times in 40
minutes.
Note (1) Values in ( ) show for the case of the 151~251 models.
Is the ambient
air temperature thermistor
connector connected
correctly?
Correct it
NO
NO
YES
YES
Is the ambient
air temperature thermistor
characteristics OK?
The ambient air temperature thermistor
is defective Replace it.
151~251, 302 models
Ambient air temperature thermistor (Tho-A)
Resistance temperature characteristics
402~1002 models
Ambient air temperature thermistor (Tho-A)
Resistance temperature characteristics
0
5
10
15
20
25
30
35
0
10
20
30
40
50
The outdoor unit control
PCB is defective
Replace it.
Temperature (ºC)
Thermistor resistance (k
Ω
)
Thermistor resistance (k
Ω
)
5
10
15
0
20
40
60
80
100
Display conditions
If the temperature sensed by the therm-
istor is –30ºC or lower continuously
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.
The error occurs when this state is de-
tected 3 times in 40 minutes.
7
[Defective ambient air temperature thermistor]
Indoor unit
Red LED
Green LED
Stays OFF
Keeps flashing
Red LED
Green LED
1 time flash
Keeps flashing
Outdoor unit
Error display :
E38
Note (1) The fi gure at right shows the ambient air
temperature thermistor (Tho-A) (Temperature
– Resistance Characteristics) for the 402 ~
1002 models. See the fi gure above for the
151~251 and 302 models.
