Samsung Air Conditioner Error Code tu

The tu code on a Samsung air conditioner indicates an open or short circuit fault in the indoor unit room temperature sensor. This NTC thermistor monitors the ambient air temperature inside the room and sends resistance-based data to the control board. When the board detects an out-of-range resistance reading, it logs the tu fault and may suspend normal operation to prevent inaccurate temperature regulation.

A power reset may temporarily clear the tu code if the fault was caused by a momentary sensor glitch, but if the sensor or wiring has a physical defect, the error will return quickly once the unit restarts. A reset alone will not resolve a failed thermistor or damaged harness. The root cause must be diagnosed and corrected for the fault to stay cleared.

If only the room temperature sensor needs replacement, the repair cost is typically in the range of $75 to $200 including parts and labor, depending on the technician's rates and the unit model. If the indoor control board has also failed, costs can rise to a range of $200 to $450 or more. Cleaning a corroded connector is generally a low-cost fix that falls on the lower end of a standard diagnostic service call.

A knowledgeable DIYer can inspect the sensor wiring harness for visible damage and check connector pins for corrosion, then clean or reseat the connector if that is the issue. Testing the thermistor itself requires a multimeter to measure resistance and compare it against expected NTC values. If the sensor has failed, replacing it is a straightforward repair, but accessing the indoor unit requires removing the front panel and filter assembly.

Operating the unit with an active tu code is not recommended. Without a functioning room temperature sensor, the control board cannot accurately regulate the cooling or heating cycle, which can lead to the system running inefficiently or cycling improperly. In many cases, the unit will restrict or suspend operation automatically as a protective measure.