Samsung Air Conditioner Error Code E110

The Samsung air conditioner E110 error code indicates a fault detected in the third temperature sensor associated with the auxiliary electric heater assembly. This sensor, often referred to as a thermistor, monitors temperatures within the electric heater circuit to ensure safe and efficient operation. When the control board receives a signal from sensor 3 that falls outside the expected resistance or voltage range, it flags the E110 code and may shut down or limit heater operation to prevent damage or unsafe conditions.

The most common causes of this fault fall into two categories: sensor hardware failures and wiring issues. Thermistors can fail due to heat exposure, moisture ingress, or physical damage, causing them to read an open circuit (very high resistance) or a short circuit (near-zero resistance). Wiring harnesses connecting sensor 3 to the control board are also prone to corrosion, loose terminal connections, or chafing, all of which can produce erratic or out-of-range signals that trigger the fault code.

Because this error involves the auxiliary electric heater circuit, it carries safety implications. The heater subsystem operates at line voltage, and any diagnostic or repair work in this area requires the unit to be fully powered down at the breaker before inspection. A technician should verify the sensor resistance with a multimeter at ambient temperature and compare it against the expected thermistor curve. If the resistance is grossly out of range or the wiring shows visible damage, component replacement is typically required to restore normal operation.