This guide explains all Samsung Air Conditioner error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.
E1
Indoor/Outdoor Communication Error
- Turn OFF power for 5–10 minutes.
- Check communication wiring between indoor and outdoor units.
- Inspect PCB connectors for looseness or corrosion.
- Restart system after reconnection.
E101
Indoor PCB Error
- Reset power supply.
- Inspect indoor control board for damage.
- Check for burnt components or traces.
- Replace PCB if issue persists.
E237-1
Outdoor PCB Communication Failure
- Check outdoor PCB wiring harness.
- Inspect signal cable integrity.
- Restart both indoor and outdoor units.
- Replace PCB if communication fails.
E154
Fan Motor Error
- Check fan blade for obstruction.
- Inspect motor wiring connections.
- Clean dust buildup from fan assembly.
- Replace motor if operation is abnormal.
E201
Indoor Fan Motor Error
- Check blower motor rotation.
- Inspect capacitor condition.
- Clean air filter and indoor unit.
- Replace motor if failure continues.
E202
Outdoor Fan Motor Error
- Check outdoor fan rotation.
- Inspect wiring and connector pins.
- Remove debris around fan blades.
- Replace motor if not functioning.
C404
Outdoor Fan Abnormal Operation
- Inspect fan blades for damage.
- Check capacitor performance.
- Clean condenser coil area.
- Replace fan motor if needed.
C101
Temperature Sensor Error
- Check indoor thermistor connection.
- Inspect wiring harness.
- Test sensor resistance values.
- Replace sensor if readings are abnormal.
E128
Indoor Temperature Sensor Failure
- Inspect sensor cable routing.
- Clean evaporator coil area.
- Check PCB connector integrity.
- Replace sensor module if needed.
C105
Indoor Coil Sensor Abnormality
- Check coil sensor wiring.
- Inspect evaporator coil condition.
- Remove dust and ice buildup.
- Replace sensor if faulty.
C417
Outdoor Temperature Sensor Error
- Inspect outdoor sensor connection.
- Check sensor placement position.
- Clean outdoor unit surroundings.
- Replace sensor if readings fail.
E203
Compressor Failure
- Check compressor wiring connections.
- Inspect relay and capacitor.
- Verify stable power supply.
- Replace compressor if no operation.
E251
Compressor Overheating
- Turn OFF system immediately.
- Clean condenser coil and vents.
- Ensure outdoor airflow is not blocked.
- Allow cooling before restart.
E440
Compressor Overload
- Check refrigerant pressure level.
- Inspect condenser coil condition.
- Ensure proper ventilation space.
- Restart system after cooldown.
E422
Low Refrigerant Detected
- Check system for leaks.
- Inspect copper piping joints.
- Avoid continuous operation.
- Call HVAC technician for recharge.
E320
Refrigerant Leak Detected
- Turn OFF unit immediately.
- Check oil residue on piping.
- Inspect evaporator and condenser coils.
- Schedule professional repair service.
E441
High Pressure Protection
- Clean condenser coil thoroughly.
- Remove airflow obstructions.
- Ensure outdoor ventilation is open.
- Restart after system stabilizes.
E451
Low Pressure Protection
- Check refrigerant level.
- Inspect for gas leaks.
- Verify expansion valve operation.
- Call technician if pressure remains low.
E162
EEPROM Error
- Reset power supply.
- Inspect main control board.
- Check for firmware corruption.
- Replace PCB if necessary.
E237
Outdoor Communication Issue
- Check communication cable integrity.
- Inspect PCB connectors.
- Restart system completely.
- Replace board if error persists.
E237-1
Outdoor Communication Failure
- Inspect wiring harness connections.
- Check signal line continuity.
- Reset system power cycle.
- Replace PCB if communication fails.
E556
System Control Error
- Power cycle the unit.
- Check main PCB condition.
- Inspect firmware integrity.
- Replace control board if required.
Frequently Asked Questions
Why does my Samsung Air Conditioner show ERR or system error messages?
ERR usually indicates a system fault such as communication failure, sensor issues, power fluctuation, or PCB malfunction. Turn off the unit, switch off the breaker for a few minutes, then restart. Check wiring connections and ensure stable power supply.
Why does my Samsung Air Conditioner stop working during operation?
This is often caused by overheating protection, dirty filters, airflow blockage, or compressor protection mode. Turn off the unit, clean filters, ensure proper ventilation, and restart after cooling.
Why does my Samsung Air Conditioner not turn on?
Check the circuit breaker, power outlet, and remote batteries. Ensure the indoor unit has power and the breaker is not tripped. If still unresponsive, reset the system.
Why does my Samsung Air Conditioner blow weak or no cold air?
Weak cooling is usually caused by dirty filters, low refrigerant, blocked airflow, or incorrect temperature settings. Clean filters and ensure doors/windows are closed.
Why does my Samsung Air Conditioner make unusual noises?
Noise may come from loose fan blades, debris in the outdoor unit, or compressor vibration. Inspect both indoor and outdoor units and remove obstructions.
Why does my Samsung Air Conditioner smell bad?
Bad odors are usually caused by mold buildup in filters or drain pan. Clean filters, wash removable parts, and ensure proper drainage.
Why does my Samsung Air Conditioner leak water?
Water leakage is often caused by clogged drain pipes, dirty filters, or improper installation. Check drainage hose and clean the unit.
Why does my Samsung Air Conditioner freeze up?
Ice buildup may be caused by low refrigerant, restricted airflow, or dirty evaporator coils. Turn off the unit and allow it to thaw before cleaning.
Why does my Samsung Air Conditioner keep turning on and off?
This may be caused by thermostat issues, unstable power supply, or compressor protection cycling. Check settings and ensure stable voltage.
Why does my Samsung Air Conditioner outdoor unit not work?
Check power supply to the outdoor unit, capacitor condition, and wiring connections. Compressor protection may also delay startup.
Why does my Samsung Air Conditioner show a blinking light?
A blinking light indicates a fault code or protection mode. Restart the unit and check filters, sensors, and power supply.
How do I reset my Samsung Air Conditioner?
Turn off the air conditioner, switch off the breaker for 5–10 minutes, then turn it back on. This clears temporary system errors.
Why is airflow weak from my Samsung Air Conditioner?
Weak airflow is usually caused by clogged filters, blocked vents, or fan issues. Clean filters and ensure nothing is obstructing airflow.
When should I service my Samsung Air Conditioner?
Service is recommended if cooling performance drops, unusual noises occur, water leaks persist, or error codes appear repeatedly.
Important: Samsung Air Conditioner system messages are designed to protect the compressor and internal components. If issues persist after troubleshooting, stop using the unit and contact an authorized Samsung service center for repair.