Samsung AC024BXUPCH - Outdoor Sensor Error - (E221, E231, E251, E320)

Troubleshooting
4-10 Samsung Electronics
4-2-3. Outdoor sensor error - (E221, E231, E251, E320)
Error CODE Description
E221 Outdoor temperature sensor error(Open/Short)
E231 Outdoor COND OUT sensor error(Open/Short)
E251 Discharge temperature sensor error of compressor1(Open/Short)
E320 OLP sensor error(Open/Short)
Power OFF
Reconnect the temperature sensor connector.
No
Yes
Yes
Replace the temperature sensor. → Power on.
→ Check the normal operation. → End the service.
No
Is the temperature
sensor measuring resistance similar to the table
on the right?
After checking normal operation, end the service.
No
Yes
Replace the outdoor unit PCB. → Power ON
→ 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
Current temp (℉) Resistance (kΩ) Current temp (℉) Resistance (kΩ)
148 4 68 10
140 5 50 20
122 6 32 30
104 7 14 40
86 8
Ex) Room temperature : 26℃ - Resistance : 10.28KΩ
Ex) OLP sensor/discharge temperature sensor measuring
resistance value by temperature : E320, E251
Current temp (℉) Resistance (kΩ) Current temp (℉) Resistance (kΩ)
156 40 86 180
148 50 68 220
140 60 50 320
122 90 32 550
104 110
Ex) Room temperature : 21℃- Resistance : 205.4KΩ
Does same error occur
again after power ON?
Outdoor unit display
, , ,
Judgment Method • Refer to checking method, as shown below.
Cause of problem • Communication error between the outdoor unit INV and Main Micom for one minutes
1.
Cause of problem