Samsung Air Conditioner Error Code *6

The *6 error code on a Samsung air conditioner indicates an outdoor unit thermistor sensor error, detected through the wired remote controller. The asterisk in the code represents the indoor unit address, so the specific number displayed identifies which indoor unit in the system is reporting the fault. The outdoor unit thermistor is a temperature-sensing resistor that continuously monitors the outdoor coil or ambient temperature, feeding real-time data to the control board to regulate compressor operation, defrost cycles, and overall system efficiency.

This error is triggered when the control system receives a signal from the outdoor thermistor that falls outside the expected resistance or voltage range. Thermistors change resistance predictably with temperature, and when the board detects an open circuit, short circuit, or out-of-range reading, it logs the fault and displays the *6 code. The first diagnostic step is to verify whether the outdoor unit thermistor is properly connected at the CN41 connector on the outdoor control board, as an unseated or disconnected plug is a frequent source of this error.

Common causes include a physically disconnected or corroded connector at CN41, a failed thermistor with a resistance reading outside normal parameters, or damaged wiring between the thermistor and the control board. In some cases, moisture ingress into the outdoor unit can cause connector corrosion or short the thermistor leads. The system will typically not operate normally while this fault is active, as accurate temperature sensing is essential for safe and efficient compressor control.