LG Microwave Error Code E-23

The E-23 error code on an LG microwave indicates a preheating maximum time error. This fault triggers when the oven cavity fails to reach the programmed target temperature within a 30-minute preheating window. Once the 30-minute limit is exceeded without achieving the preset temperature, the control board registers the fault, displays E-23, and automatically cancels the current cooking operation to prevent damage or unsafe conditions.

The two primary systems involved in this error are the temperature sensor and the heating element (heater). The sensor is responsible for monitoring the cavity temperature and reporting it back to the control board in real time. If the sensor is reading inaccurately, whether due to a short, open circuit, or physical damage, the control board may never receive confirmation that the target temperature has been reached, even if the heater is functioning correctly. Conversely, if the heater itself is underperforming or has failed entirely, the cavity simply will not heat to the required level within the allotted time.

Diagnosing this error starts with inspecting the temperature sensor and the heater as the two most probable failure points. The sensor should be tested for proper resistance and continuity, and wiring connections to both components should be checked for corrosion, looseness, or damage. A heater that is partially functional may still generate some heat but cannot achieve adequate temperatures within the 30-minute limit, making this a less obvious but equally important cause to evaluate.