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Samsung Air Conditioning Fault Codes & Solutions

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The Samsung range of air conditioners uses groundbreaking technology to operate efficiently and achieve a comfortably cool temperature. However, all systems can face problems over time, despite how advanced they are.

If your air conditioning starts demonstrating issues such as failing to reach the set temperature or operating abnormally noisy, check the unit’s display screen for a fault code. To identify the cause and solution, you’ll need to understand the code’s meaning.

In this guide, BOXT has listed various error codes to Samsung air conditioning systems signify so that you can get the unit functioning properly quickly.


Error Code

Cause

Solution

CF

A reminder to clean the filter. 

Clean or replace the inner filters of the indoor unit.

Cl

An auto clean indicator.

Start the auto-clean function.

dF

A requirement for the automatic defrost function.



Run the automatic defrost function.

E 1 or 21

Indoor unit’s room temperature sensor error.

Contact an authorised Samsung service centre.

E 1 or 22

Heat exchanger temperature sensor error.

Contact an authorised Samsung service centre.

E1 or 54

An error with the fan motor or capacitor.

Contact an authorised Samsung service centre.

E1 or 63

A problem with the EEPROM.

Contact an authorised Samsung service centre.

E5

An error with the indoor heat exchanger sensor.

Check the exchanger sensor departure of the indoor unit as it may need replacing.

E6

Outdoor heat exchanger sensor error.

Check the exchanger sensor departure of the outdoor unit as it may need replacing. 

E7

A problem with the heater temperature sensor.

Check the heater temperature sensor departure as it may need replacing.

E101

Indoor unit communication error.

Inspect the power and control cables connection between the units.

E102

Communication error received from the outdoor unit.

Check the power and communication cables connection between the units.

The outdoor unit PCB may need replacing.

E108

Error due to repeated communication address. 

Check on the repeated indoor unit main address.

Change the address and reset the system.

E121

An error with the indoor unit’s room temperature sensor.

Contact an authorised Samsung service centre. 

E122

A problem with the indoor unit’s EVAP IN sensor (short or open). 

Reconnect the connector to PCB if it’s disconnected and restart the system.

If the temperature sensor resistance value is out of range, replace the indoor heat exchanger temperature sensor.

If it isn’t, replace the PCB and restart the system.

E123 

An error with the indoor unit’s EVAP OUT sensor (short or open).

Reconnect the connector to PCB if it’s disconnected and restart the system.

If the temperature sensor resistance value is out of range, replace the indoor heat exchanger temperature sensor.

If it isn’t, replace the PCB and restart the system.

E128

The indoor unit’s EVAP IN sensor is detached.

Check the indoor unit.

E129 

The indoor unit’s EVAP OUT sensor is detached.

Check the indoor unit.

E154

Error on indoor unit’s fan.

Contact an authorised Samsung service centre.

E163

EEPROM Option error.

Contact an authorised Samsung service centre.

E198

Error on the thermal fuse of indoor unit (open).

Check the connection of the CN140 wire.

Check the connection of the terminal block.

Replace the main PBA if necessary.

E201

A communication tracking failure between the indoor and outdoor unit.

Ensure the dial is set to the number of indoor units connected and check all communication and power wiring.

E202

A communication error between the indoor and outdoor unit.

Check the communication wire and power wire connection.

The communication connector may need reconnecting.
If needed, replace the outdoor unit’s main PCB.

E203

A communication error between the main and sub micoms of an outdoor unit.

Check the outdoor unit inverter PBA’s power cable and communication cable.

The main PBA or inverter PBA may need replacing.

E221

An error on the outdoor unit’s ambient temperature sensor (short or open).

Check the connection of the temperature sensor connector and check the resistance value of the temperature sensor.

The temperature sensor may need replacing or reconnecting.

If the error keeps occurring, end the service.

E231 

An error on the cond-out temperature sensor of the outdoor unit (open or short).

Check the connection of the temperature sensor connector and check the resistance value of the temperature sensor.

The temperature sensor may need replacing or reconnecting.

If the error keeps occurring, end the service.

E237

Condenser temperature sensor error.

Check the temperature sensor.

E251

An error on the discharge temperature sensor of the compressor (short or open).

Check the connection of the temperature sensor connector and check the resistance value of the temperature sensor.

The temperature sensor may need replacing or reconnecting.

If the error keeps occurring, end the service.

E291

High-pressure sensor error (short or open).

Check the connection between the high-pressure connector and the PCB and reconnect if necessary.

You may need to refill the refrigerant after vacuum. 


If necessary, replace the high-pressure sensor.

E296

Low-pressure sensor error (short or open)

Check the connection between the low-pressure connector and the PCB and reconnect if necessary.

You may need to refill the refrigerant after vacuum. 


If necessary, replace the low-pressure sensor.

E320

Error on OLP sensor (Short or Open).

Check the OLP sensor.

E403

Compressor down due to outdoor unit freezing detection.

Check the relevant indoor fan and EEV if they aren’t operating correctly.

If the indoor heat exchanger sensor shows the temperature correctly, check for indoor air inlet blockage. If it doesn’t, refer to E122.


E404

Outdoor unit overload protection control error.

Check compression when it starts.

E407

Compressor down due to the high-pressure sensor protection control.

Replace the high-pressure sensor if the values of S-net and manifold gauge don’t correspond.

Check the relevant EEV if it isn’t operating correctly.

Check the piping. If there’s no clogging in place, check the amount of refrigerant. 

E410

Compressor down due to the low-pressure sensor protection control.

Replace the high-pressure sensor if the values of S-net and manifold gauge don’t correspond.

Check whether the relevant EEV is operating correctly.

Check the piping. If there’s no clogging in place, check the amount of refrigerant.

If there’s any leakage, replace the relevant parts.

E416

The outdoor unit compressor is down due to the discharge temperature protection control.

Replace the discharge temperature sensor if the resistance of the compressor is normal.

E419

Outdoor unit EEV open error.

Check the EEV.

E422



A pipe blockage error.

Check the open state of the outdoor unit service valve and the connection of the pipe.

Check the operation of the EEV, refrigerant leakage, the connection of the indoor unit PBA EVA sensor, and the fault in the indoor unit EVA sensor.

E425

Outdoor unit reverse-phase detection 1 error.

Check the 3-phase power compression is normal.

If it is, use the 3-phase tester to check the power line phase. It if shows ‘reverse phase, change the current power line connection.

Then, press the reset key and recheck the power.

E438

EVI EEV open error.

Check and connect the ESC EEV connector to the PBA.

Check and assemble the EEV coil.

E439

A refrigerant leakage error (during stop status).

You may need to replace the PCB or the high/low-pressure sensor.

You may need to refill the refrigerant after vacuum.

E440

Forbid heating mode operation when the outdoor temperature is over 30 °C.

This function protects the product by limiting the available temperature range. Refer to the usable temperature range in the product manual.

Replace the temperature sensor if the outdoor temperature is different to the temperature sensor value of the outdoor inlet air. 

E441

Forbid cooling mode operation when the outdoor temperature is below -5 °C.

This function protects the product by limiting the available temperature range. Refer to the usable temperature range in the product manual.

Replace the temperature sensor if the outdoor temperature is different to the temperature sensor value of the outdoor inlet air. 

E442

Forbid an operation during heat mode with refrigerant charging operation when the outdoor temperature is over 15°C.

This function protects the product by limiting the available temperature range. Refer to the usable temperature range in the product manual.

Replace the temperature sensor if the outdoor temperature is different to the temperature sensor value of the outdoor inlet air. 

E443

A refrigerant leakage error (during operation).

Check and reconnect the connector between the high-pressure sensor and PCB if necessary.

Refill or recharge the refrigerant if there’s leakage in the system or charging inferior.

If there’s no leakage, replace the high-pressure sensor.

E453

Error with the fan motor overheating.

Check the connecting wires.

The fan PCB or motor may need replacing.

E454

Fan motor RPM error.

Re-connect the connector if necessary.

The motor may need changing.

E455

Fan motor IPM high-temperature error.

Remove any foreign objects between the heat sink pin and IPM. Check the bolt is correctly tightened.

Apply the heat sink grease.

E456

Fan motor over-voltage error.

Check if the fan motor rotates or is locked. Not being locked indicated the overload status.

Check if there is a problem with the fan load status.

E457

Fan motor reverse rotation error.

Check if the start instruction of the outdoor unit’s fan is counter-clockwise.

Check the operational condition without power to protect the motor.

Check whether there is wind strong enough to force the fan to rotate counter-clockwise where the outdoor unit is installed.

E458

Outdoor unit fan error.

After turning the power off, check the connection of the fan connector.

Check the voltage of the fan motor connector and the power connection on the outdoor unit inverter.

E460

Connection error between the communication and power cable.

Check the indoor and outdoor units wiring. 

E461

Error due to operation failure of inverter compressor.

Check the power connection and restart after power reset.

Check the compressor and the connection of the compressor wire.

Check the defective compressor wire single parts.

The compressor, inverter PCB, or compressor wires may need replacing.

E462

Compressor stops due to full current protection control.

Check the outdoor and indoor units are installed correctly.

Open the valve if needed.

Change the compressor if it isn’t functioning properly.

The outdoor unit inverter PBA may need changing.

E463

System stop due to OLP temperature control.

Check the OLP sensor.

E464

IPM over current error.

Check the outdoor and indoor units are installed correctly.

Check the piping/wiring between

the indoor and outdoor unit is correct.

Open the valve if necessary.

Check the connection of the compressor.

The compressor, compressor wire or PCB may need changing. Reassemble wiring if needed.

Check the location and

the measured value of the

temperature sensor.

E465

Compressor overload prevention.

If the compressor operation isn’t normal, change it and check it’s functioning correctly.

If the compressor operation is normal, check the assembly between the heat sink plate. If no problem is found, change the inverter PBA.

E466

DC-Link voltage under/over error.

Re-connect the power cable if needed.

Check the reactor and

reactor wire connection. May need to reconnect the wiring or change the reactor.

Change the EMI PBA fuse if it’s disconnected.

Check the terminal block

and the power terminal cabinet.

May need to change the outdoor unit inverter PBA.

E467

Compressor rotation error.

Check the power and restart after the power reset.

Check the compressor and wire assembly.
The compressor, compressor wire, or outdoor unit PBA may need changing.

E468

Current sensor error (short or open).

Check the PCB operation is normal.

E469

DC-Link voltage sensor error.

Check the value of the DC link when the error occurs and check the reactor disconnection. 

E470

Outdoor unit EEPROM Read/Write error (Option).

Check the outdoor EEPROM data.

E471

Outdoor unit EEPROM Read/Write error (H/W).

Check the outdoor EEPROM PBA.

E474

Error on IPM Heat Sink sensor.

Clean and remove any dust and other debris on the outdoor unit.

Check the connection between the heat sink and inverter PBA.

Make sure the grease is applied correctly, and the screw is firmly fixed.

E475

Error of inverter fan 2.

After turning the power off, check the connection of the fan connector.

Check the voltage of the fan motor connector and the power connection on the outdoor unit inverter.

E483

Over-voltage protection error.

Re-connect the power wire if needed.

Check the reactor and

reactor wire connection. May need to reconnect the wiring or change the reactor.

Replace the EMI PCB fuse if it’s defective.

Check the terminal block

and the power terminal cabinet.

The outdoor unit inverter PCB may need replacing.

E484

PFC over-current error.

Check the outdoor and indoor units are installed correctly. 


Open the valve if needed.


Change the compressor if it isn’t functioning correctly.


The outdoor unit inverter PBA may need changing.

E485

Error on input current sensor.

Check the input sensor while the set is in stop status for problems.

When the error occurs, turn the power on and off. If the same error occurs while the power is off, change the inverter PBA.

E488

AC input voltage sensor error.

Re-connect the power wire if needed.

Check the reactor and

reactor wire connection. You may need to reconnect the wiring or change the reactor.

Replace the EMI PCB fuse if it’s defective.

Check the terminal block

and the power terminal cabinet.

The outdoor unit inverter PCB may need replacing.

E500

IPM overheat error for outdoor unit inverter compressor.

Clean and remove any dust and other debris on the outdoor unit.

Check the connection between the heat sink and inverter PBA.

Make sure the grease is applied correctly, and the screw is firmly fixed.

E508

Smart install mode error.

Enter smart install mode. 

E554

Gas leak detected.

Turn the power off for 30 seconds and restart. If the error still occurs, check the compressor

and compressor wire assembly.

Change the compressor or reassemble the wiring if necessary.

Check the outdoor and indoor unit

pipes/cables are correctly installed.

Open the service valve if it isn’t already fully open.

Re-connect the sensor connector if it has disconnected.

Check the refrigerant and charge if necessary.

Contact an authorized Samsung service centre immediately. 

E556

Error due to mismatching capacity of the indoor and outdoor unit.

Check the indoor and outdoor unit capacity.



If the error code on the unit’s display screen isn’t included in this guide, or if you need assistance with addressing the air conditioner’s problem, contact an authorised Samsung service centre. Keep in mind, the first letter of the error code may differ depending on the model. 

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Need a new air conditioning unit?


If your air conditioning system has reached the end of its lifespan, use the BOXT ‘find an AC’ online tool to get a fixed price quote for a replacement. After answering a few simple questions about your home, we’ll recommend a selection of suitable air conditioners for your property.

BOXT’s range of air conditioners includes the Samsung CEBU system and the Samsung Comfort Wind-Free unit. For more information, you can also speak to a qualified engineer using the live chat.

Choose from a wide range of installation dates and for next day delivery, complete your order by 3.30pm.

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