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

Troubleshooting

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
Power OFF
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.
Yes
Ex) COND. sensor/outdoor unit temperature sensor measuring resistance value by temperature : E231, E221
Current temp(°C) Resistance(kΩ) Current temp(°C) Resistance(kΩ)
Yes
Ex) OLP sensor/discharge temperature sensor measuring resistance value by temperature : E320, E251
Current temp(°C) Resistance(kΩ) Current temp(°C) Resistance(kΩ)
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
Reconnect the temperature sensor connector.
Replace the temperature sensor.
No
Check the normal operation. End the service.
70 4 20
60 5 10
50 6 0
40 7 -10
30 8
80 40 30
70 50 20
60 60 10
50 90 0
40 110
No
After checking normal operation, end the service.
4-40
Description
Power on.
Ex) Room temperature : 26 -
Resistance : 10.28KΩ
10
20
30
40
Ex) Room temperature : 21 -
Resistance : 205.4KΩ
180
220
320
550