Samsung Air Conditioner Error Code E168

E168 means the indoor unit has detected that both the heat exchanger inlet and outlet temperature sensors are disconnected or not providing a valid signal. These NTC thermistor sensors monitor refrigerant temperature across the evaporator coil. Without readings from either sensor, the unit cannot regulate cooling safely and will shut down. The fault must be resolved before normal operation can resume.

No. The system uses these sensors to prevent the evaporator coil from freezing and to protect against overheating conditions. Operating without valid sensor data removes these safeguards and can lead to compressor damage or coil icing. The unit will typically prevent operation automatically when E168 is active, and this protection should not be bypassed.

Repair cost depends on the root cause. If loose connectors are the only issue, a service call fee in the range of $75 to $150 may be the only expense. Replacing one or both heat exchanger thermistors typically adds $50 to $150 in parts per sensor. If the control board requires replacement, total costs can rise to the $300 to $600 range depending on the model and labor rates in your area.

A knowledgeable homeowner can check whether the sensor connectors have simply come loose at the indoor unit control board, as reseating a disconnected connector requires no special tools. However, testing thermistor resistance or inspecting wiring for internal breaks requires a multimeter and some technical knowledge. If connectors appear secure and the error persists, a qualified technician should diagnose the sensors and wiring harness.

A power reset may temporarily clear the error display, but E168 will return immediately if the underlying sensor or wiring fault is still present. The control board checks sensor status on startup and continuously during operation, so the code will reappear as soon as the unit attempts to run. The physical cause must be corrected to permanently clear the fault.