Troubleshooting
Samsung Electronics 4-35
4-3-11 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
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
No
Is the temperature sensor measuring
resistance similar to the table on the left?
After checking normal operation,
end the service.
No
Yes
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) Current temp(°C)
70 4 20 10
60 5 10 20
50 6 0 30
40 7 -10 40
30 8
Current temp(°C) Current temp(°C)
80 40 30 180
70 50 20 220
60 60 10 320
50 90 0 550
40 110
Does same error occur again after power
ON?
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