Troubleshooting
42
Samsung Electronics
4-3-3 What to check before diagnosis
4-3-3-1 Lamp combination expression method display (cassette type indoor unit)
- Global 4way cassette type
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Error detection and restart
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When error occurs during operation, indicate a problem with LED flashes, and no other operations but LED stops.
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When restarting operation with remote controller or switch, it will determine the appropriate error mode after normal operation.
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LED lamp display with error detection
Abnormal condition
Error
code
LED Display
Operation
Defrost
Timer
Filter
Error on indoor temperature sensor (Short or Open)
E121
1. Error on Eva-in sensor (Short or Open)
2. Error on Eva-out sensor (Short or Open)
3. Discharge sensor error (Short or Open)
E122
E123
E126
Indoor fan error
E154
1. Error on outdoor temperature sensor (Short or Open)
2. Error on cond sensor
3. Error on discharge sensor
Other outdoor unit sensor error that is not on the above list
E221
E237
E251
1. When there is no communication between the indoor∙outdoor
units for 2 minutes
2. Communication error received from the outdoor unit
3. 3 miniute tracking error on outdoor unit
4. Communication error after tracking due to unmatching number of
installed units
5. Error due to repeated communication address
6. Communication address not confirmed
Other outdoor unit communication error that is not on the above list
E101
E102
E202
E201
E108
E109
Self diagnosis error display
1. Error due to opened EEV (2nd detection)
2. Error due to closed EEV (2nd detection)
3. Eva in sensor is detached
4. Eva out sensor is detached
5. Thermal fuse error (Open)
E151
E152
E128
E129
E198
1. COND mid sensor is detached.
2. Refrigerant leakage (2nd detection)
3. Abnomally high temperature on Cond (2nd detection)
4. Low pressure s/w (2nd detection)
5. Abnomally high temperature on discharged air on outdoor unit
(2nd detection)
6. Indoor operation stop due to unconfirmed error on outdoor unit
7. Error due to reverse phase detection
8. Comp stop due to freeze detection (6th detection)
9. High pressure sensor is detached
10. Low pressure sensor is detached
11. Outdoor unit copression ration error
12. Outdoor sump down_1 prevetion control
13. Compressor down due to low pressure sensor prevention control_1
14. Simultaneous opening of cooling/heating MCU SOL valve (1st detection)
15. Simultaneous opening of cooling/heating MCU SOL valve (2nd detection)
Other outdoor unit self-diagnosis error that is not on the above list
E241
E554
E450
E451
E416
E559
E425
E403
E301
E306
E428
E413
E410
E180
E181
Flowating s/w (2nd detection)
E153
EEPROM error
E162
