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Samsung Troubleshooting

List of Samsung Aircon Error Codes

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In this article, we’ll show you the complete Samsung air conditioner error codes and how to use them to diagnose and fix any issue affecting your aircon unit.


Samsung AC Error Codes: The Complete List

Code Possible Cause
Ch Prohibit starting during operation of the Crack case heater
E108 Error due to repeated communication address
E121 Error on room temperature sensor of indoor unit (Short or Open)
E122 Error on EVA IN sensor of indoor unit (Short or Open)
E123 Error on EVA OUT sensor of indoor unit (Short or Open)
E124 Communication error sends from indoor unit
E128 Indoor unit EVA IN sensor breakaway
E129 Indoor unit EVA OUT sensor breakaway
E131 Indoor unit heater sensor error
E151 Indoor unit EEV open failure(When 2* detection)
E152 Indoor unit EEV close failure(When 2“ detection)
E153 Indoor unit floating S/V error(When 2“ detection)
E154 Indoor unit fan error
E162 Outdoor unit EEPROM error
E198 Error on thermal fuse of indoor unit (Open)
E201 Communication error between indoor unit and outdoor unit (Pre tracking failure or when actual number of indoor units are different from the indoor unit quantity setting on the outdoor unit) Error due to communication tracking failure after initial power supply (The error occurs with the failure regardless of the number of devices)
E202 Communication error between indoor and outdoor unit (When not received in every room after completing the tracking)
E203 Communication error between outdoor unit inv - main micom (For PF #4~#6 controller, error will be determined from the time when compressor turns on)
E221 Error on outdoor temperature sensor (Short or Open)
E231 Error on outdoor COND OUT sensor (Short or Open)
E241 COND OUT sensor breakaway
E251 Digital comp.1 discharge temperature sensor(Short or Open)
E256 Fixed comp.1 discharge temperature sensor(Short or Open)
E257 Fixed comp.2 discharge temperature sensor(Short or Open)
E258 Fixed comp.3 discharge temperature sensor(Short or Open)
E262 Fixed compl Discharge temperature sensor breakaway
E263 Fixed comp2 Discharge temperature sensor breakaway
E264 Fixed comp3 Discharge temperature sensor breakaway
E265 Digital compl Sump temperature sensor breakaway. Fixed compl Sump temperature sensor breakaway
E267 Fixed comp2 Sump temperature sensor breakaway
E268 Fixed comp3 Sump temperature sensor breakaway
E269 Suction temperature sensor breakaway
E271 Comp.1 Sump temperature sensor(Short or Open)
E291 High pressure sensor(Short or Open)
E296 Low pressure sensor(Short or Open)
E307 Oil balance sensorl (Short or Open)
E308 Suction sensor(Short or Open)
E311 Double pipe sensor(Short or Open)
E320 Error on OLP sensor (Short or Open)
E403 Compressor down due to freeze protection control
E404 System stop due to overload protection control
E407 Comp, down by high pressure
E410 Comp, down by low pressure
E413 Comp, down by the sump protection control
E416 Comp, down by the discharge temperature sensor
E422 Blockage detected on high pressure pipe
E425 Reverse phase or open phase
E428 Comp down by compression ratio control
E431 Equal oil valve 1 self diagnosis
E440 Heating operation restricted at outdoor temperature overheating value (default: 30 °C)
E441 Cooling operation restricted at outdoor temperature below cool value (default 0°Q
E442 Forbid an operation during heat mode with refrigerant charging operation when outdoor temperature is over 15°C
E443 Start prohibition by refrigerant pressure error
E452 Instant power off error
E453 Fan motor hifi temperature error
E454 Fan motor RPM error
E455 Fan motor IPM high temperature error
E456 Fan motor over current error
E457 Fan motor reverse rotation error
E458 Fan speed error
E461 Error due to operation failure of inverter compressor
E461 CTJow current
E462 System stop due to full current control
E463 System stop due to OLP temperature control
E464 System stop due to DC Peak
E465 Compressor overload prevention
E466 DC-Link voltage under/over error
E467 Error due to abnormal rotation of the compressor or unconnected wire of compressor
E468 Error on current sensor (Short or Open)
E469 Error on DC-Link voltage sensor (Short or Open)
E470 Outdoor unit EEPROM Read/Write error (Option)
E471 Outdoor unit EEPROM Read/Write error (H/W)
E472 AC Line Zero Cross Signal out
E473 Comp Lock error
E474 Error on IPM Heat Sink sensor of inverter 1 (Short or Open)
E475 Error of inverter fan 2
E484 PFC Overload (Over current) Error
E485 Error on input current sensor of inverter 1 (Short or Open)
E500 IPM over heat error on inverter 1
E508 Smart install is not installed
E554 Gas leak detected
E556 Error due to mismatching capacity of indoor and outdoor unit
E557 DPM remote controller option error
E560 Switch option setting error(rvot applied)
E590 Inverter EEPROM Checksum error
E660 Error of inverter Boot Code
P701 Indoor unit floating S/V error(When 1“ detection)
P702 Indoor unit EEV close failure(When 1“ detection)
P703 Indoor unit EEV open failure(When 1“ detection)

Code Possible Cause Solution
* 1 Indoor unit thermistor sensor error Indoor unit thermistor sensor
PCB of the Indoor unit
* 5 Indoor unit pipe thermistor sensor error Indoor unit pipe thermistor sensor
PCB of the indoor unit
* 6 Outdoor unit thermistor sensor error Outdoor unit thermistor sensor
PCB of the outdoor unit
* 9 Float switch error Drain pump, Float switch
Drain system
DIP switch (SW2) of the indoor unit (The No.2 and No.4 switches must be at “ON” position.)
* A A Indoor and Outdoor communication error Communication cables of indoor and outdoor units
PCB of indoor and outdoor units
*C Wired remote controller communication error Wired remote controller cables, Wired remote controller
Main/Sub PCB of the indoor unit
* D Outdoor pipe thermistor sensor error Outdoor pipe thermistor sensor
PCB of the outdoor unit

Code Possible Cause
E1 Indoor unit room thermistor error
E5 Indoor unit pipe thermistor error
E6 Outdoor unit thermistor error
E9 Float switch open error
EA Communication error between indoor unit and outdoor unit
EC Communication error between wired remote controller and indoor unit
ED Outdoor unit pipe thermistor error
Reservation LED flickering(1Hz period) Indoor temperature sensor abnormal
Operation LED and reservation LED flickering (1Hz period) Indoor pipe temperature sensor abnormal
Operation LED and filter LED flickering (1 Hz period) Outdoor temperature sensor abnormal
Reservation LED filter LED alternating flickering (1Hz period) Float switch open abnormal
Reservation LED and filter LED flickering (1Hz period) Indoor and outdoor communication abnormal
Operation LED and reservation LED alternating flickering (1Hz period) Wired remote controller communication abnormal
Filter LED flickering (1Hz period) Outdoor pipe temperature sensor abnormal

Is your problem not in this list? Maybe it's a common aircon problem we've already encountered. Read more about it here.

Code Possible Cause Solution
E1 Short of indoor temperature sensor
Open of Indoor temperature sensor
Check of departure of indoor temperature sensor
Check of PCB open/short
E5 Short of indoor heat exchanger sensor
Open of indoor heat exchanger sensor
Check of indoor exchanger sensor departure
Check of PCB open/short
Replacement of sensor
E6 Short of outdoor heat exchanger sensor
Open of outdoor heat exchanger sensor
Check of outdoor exchanger sensor departure
Check of PCB open/short
Replacement of sensor
E7 Short of heater temperature sensor
Open of heater temperature sensor
Check of heater wiring diagram
Check of sensor attachment location
EL When the electrical heater is overheated Check of heater temperature sensor departure
Check of PCB open/shore
Replacement of sensor

Error Type LED Lamp Display
Operation Defrost Timer Airflow Filter
Power reset Flickering OFF OFF OFF OFF
Error of temperature sensor in the indoor unit (Open/Short) OFF OFF Flickering OFF OFF
Error of the outdoor temperature sensor
Error of the condenser temperature sensor
Error of the discharge temperature sensor
Flickering OFF OFF Flickering OFF
1. No communication for 2 minutes between indoor units (Communication error for more than 2 minutes)
2. Indoor unit receiving the communication error from outdoor unit
3. Outdoor unit tracking 3 minutes error
4. When sending the communication error from the outdoor unit, the mismatching of the communication numbers and installed numbers after completion of tracking (Communication error for more than 2 minutes)
OFF OFF Flickering Flickering OFF
1. Error of electronic expansion valve close
2. Error of electronic expansion valve open
3. 2nd detection of high temperature cond
4. 2nd detection of high temperature discharge
5. Error of reverse phase
6. Compressor down due to 6th detection of freezing
OFF OFF Flickering Flickering Flickering
Detection of the float switch OFF OFF OFF Flickering Flickering
Error of setting option switches for optional accessories OFF OFF Flickering OFF Flickering
EEPROM option error Flickering Flickering Flickering Flickering Flickering

Code Possible Cause
101 Indoor unit Communication Error
102 Indoor/Outdoor unit Communication Time Out Error 60 Packet Over data
201 Indoor unit is not connected
203 Communication Error between Outdoor Main and Inverter Micom (Occurred after 1 minute detection in Main and Inverter)
121 Indoor Temp. Sensor (Open/Short Error)
122 Indoor Unit Eva in Sensor (Open/Short Error)
128 Indoor Unit Eva in Sensor Separation
221 Outdoor Temp Sensor Error (Open/Short Error)
237 CONDTemp. Sensor Error (Open/Short Error)
251 Inverter Compressor Discharge Temp, sensor Error (Open/Short Error)
425 Power cable miss connection error
153 Indoor Float Switch 2nd Detection
460 Outdoor unit - indoor unit communication wire miss connection (Connected to Power terminal)
554 Outdoor unit refrigerant full leakage (Gas leak)
458 Outdoor Fan 1 Error
475 Outdoor Fan 2 Error
416 Discharge over temperature
461 (Inverter) Compressor starting error
462 Primary Current Over Trip error
464 (Inverter) IPM Over Current(O.C)
467 (Inverter) Compressor Rotation error
468 (Inverter) Current Sensor error
469 (Inverter) DC LINK Sensor error
471 (Inverter) EEPROM Read/Write Error
474 (Inverter) Heatsink temperature over Error
556 Outdoor unit Capacity Setup option error
601 Communication error between Indoor unit and wired remote control
602 Communication error between Master and Slave wired remote control
606 COM1/COM2 Cross-installed error
EA Error of setting option for wired remote control COM2

Code Possible Cause
601 Communication error between wired remote control < -> indoor unit/ventilation system (ERV) (When communication has stopped for 3 minutes after detecting indoor unit/ventilation system (ERV) and wired remote control)
602 Communication error between wired remote control < -> indoor unit/ventilation system (ERV) (When communication has stopped for 3 minutes after detecting indoor unit/ventilation system (ERV) and wired remote control)
604 Tracking 10 or more errors between wired remote control < -> indoor unit/ventilation system (ERV)
606 - COM1, COM2 crossing connection error
- When wired remote control is connected to indoor unit COM 1 (F1,F2) terminal
607 - Multiple master error
- Error occurred during installation when two wired remote controls are both set as masters in one communication line (This is not possible to detect if the communication polarity is connected in reversed polarity.)
608 Ventilation system (ERV) is not installed incase of outside gearing.
609 Indoor unit is not installed in case of outside gearing (when the indoor unit is not detected after outside gearing option setting and tracking are finished).
618 - Exceeded maximum no. of installation for indoor unit/ventilation system (ERV) (16 equipment devices)
- A reset is required after checking the number of indoor unit/ventilation system (ERV) installations
619 - Mixed installation error for°C/°F indoor unit
- Error occurs when mixed indoor units of °C and "F settings are installed
620 -Wired remote control °C/°F setting error
-This error occurs if the indoor unit is set in °C while the wired remote control is set in °F or vice versa.
621 This error occurs when the option settings of the master and slave wired remote controls are different from each other.
627 Slave wired remote control installation error (when two slave wired remote controls are installed)
630 Normal operation option setting error (when normal operation is selected with the wired remote control for a ventilation system (ERV) that does not support the normal operation option)
631 Automatic operation option setting error (when automatic operation is selected with the wired remote control for a ventilation system (ERV) that does not support the automatic operation option)
653 Temperature sensor open/short error
654 - FRAM READ/WRITE error
- Damper error [error is detected when there is no input for 100 seconds (time for about 5 revolutions) during damper output]

LED Display Explanation
Yellow Green Red
LED OFF LED OFF LED OFF Power off/VDD NG
LED OFF LED BLINK IPM Over Current(O.C)
LED OFF LED ON LED ON Abnormal Serial communication
LED OFF LED BLINK LED OFF Compressor Starting error
LED OFF LED BLINK LED ON Normal Operation
LED OFF LED ON LED OFF Compressor Lock error
LED OFF LED ON LED BLINK DC-Link voltage under/over error
LED BLINK LED OFF LED BLINK Outdoor temperature sensor error
LED BLINK LED OFF LED ON Discharge over temperature
LED BLINK LED BLINK LED OFF Discharge temperature sensor error
LED BLINK LED BLINK LED ON Current sensor error
LED BLINK LED ON LED OFF Compressor limit error
LED BLINK LED ON LED BLINK Coil temperature sensor error
LED BLINK LED ON LED ON Imin.Time out Communication
LED ON LED OFF LED OFF Fan error
LED ON LED OFF LED BLINK OTP error
LED ON LED OFF LED ON Compressor rotation error
LED ON LED BLINK LED OFF Operation condition secession(Dual only)
LED ON LED BLINK LED BLINK DC-Link voltage sensor error
LED ON LED BLINK LED ON l_Trip error / PFC Over current
LED ON LED ON LED OFF GAS Leak error
LED ON LED ON LED BLINK AC Line Zero Cross Signal out
LED ON LED ON LED ON Power ON reset(l sec)
LED BLINK LED OFF LED OFF Capacity miss match
LED OFF LED BLINK LED BLINK Test Operation at Cooling Mode
LED BLINK LED BLINK LED BLINK Test Operation at Heating Mode

Description Lamp Main Checking Point
Operation Timer Turbo
Indoor unit room temperature sensor error (open or short) Lamp on Lamp blink Lamp on 3-2P
Indoor unit heat exchanger temperature sensor error (open or short) Lamp blink Lamp blink Lamp on 3-3P
Indoor fan motor malfunction Lamp on Lamp on Lamp blink 3-4P
EEPROM error Lamp blink Lamp blink Lamp blink Option Setting
Option error (option wasn't set up or option data error) Lamp blink Lamp blink Lamp blink Option Setting
Outdoor unit error Lamp blink Lamp on Lamp blink Remote Control on/off Outdoor Unit Power Reset

Also read: LG Aircon Error Codes

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