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4-4-11. Outdoor sensor error(Error Code : E221, E231, E251, E320)
1. Test items
1) Check the connection of the temperature sensor connector.
2) Check the resistance value of the temperature sensor.
2. Check procedure
Is the temperature sensor connector connected?
Is the temperature sensor measuring resistance
similar to the table on the left?
Does same error occur again after power ON?
Replace the outdoor unit PCB.
confirming the state is normal, end the service.
Power OFF
Yes
Yes
Yes
Power ON
After
Error CODE
E221
Outdoor temperature sensor error
E231
Outdoor temperature sensor error
E251
Outdoor temperature sensor error
E320
Outdoor OLP sensor error
No
No
Ex) COND. sensor/outdoor unit temperature sensor measuring resistance value by temperature : E231, E221
Current temp(°C) Resistance(kΩ) Current temp(°C) Resistance(kΩ)
70
4
60
5
50
6
40
7
30
8
Ex) OLP sensor/discharge temperature sensor measuring resistance value by temperature : E320, E251
Current temp(°C) Resistance(kΩ) Current temp(°C) Resistance(kΩ)
80
40
70
50
60
60
50
90
40
110
No
4-41
Description
Reconnect the temperature sensor connector.
Replace the temperature sensor.
Check the normal operation. End the service.
Ex) Room temperature : 26 -
20
10
Resistance : 10.28KΩ
10
20
0
30
-10
40
Ex) Room temperature : 21 -
Resistance : 205.4KΩ
30
180
20
220
10
320
0
550
After checking normal operation, end the service.
Troubleshooting
Power on.
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