Samsung AC071MN4PKH - Outdoor Sensor Error(Error Code: E221, E231, E251, E320)

Troubleshooting
4-40
4-4-12. 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
Error CODE Description
E221 Outdoor temperature sensor error
E231 Outdoor temperature sensor error
E251 Outdoor temperature sensor error
E320 Outdoor OLP sensor error
Power OFF
Reconnect the temperature sensor connector.
No
Yes
Yes
Replace the temperature sensor. ĺ Power on. ĺ
Check the normal operation. ĺEnd the service.
No
Is the temperature sensor measuring resistance
similar to the table on the left?
After checking normal operation, end the service.
No
Yes
Replace the outdoor unit PCB. ĺ Power ON ĺ After
confirming the state is normal, end the service.
Is the temperature sensor connector connected?
Ex) COND. sensor/outdoor unit temperature sensor measuring resistance value by temperature : E231, E221
Ex) OLP sensor/discharge temperature sensor measuring resistance value by temperature : E320, E251
Current temp(°C) Resistance(k) Current temp(°C) Resistance(k)
70 4 20 10
60 5 10 20
50 6 0 30
40 7 -10 40
30 8
Current temp(°C) Resistance(k) Current temp(°C) Resistance(k)
80 40 30 180
70 50 20 220
60 60 10 320
50 90 0 550
40 110
Ex) Room temperature : 26ఁ -
Resistance : 10.28K
Ex) Room temperature : 21ఁ-
Resistance : 205.4K
Does same error occur again after power ON?