LG Microwave Error Code E-52

The E-52 error code on an LG microwave indicates a humidity sensor short error. The humidity sensor, sometimes called a moisture or steam sensor, is responsible for detecting the level of steam produced during cooking. The microwave's control board monitors the signal from this sensor continuously, and when it detects a short circuit condition in the sensor circuit, it triggers the E-52 code and typically halts operation to prevent incorrect cooking cycles or component damage.

A short circuit in the humidity sensor circuit means the resistance in the sensor or its wiring has dropped to an abnormally low level, causing the signal voltage to fall outside the acceptable operating range. This condition can result from a failed sensor element, damaged wiring insulation, moisture intrusion into the connector, or corrosion on the sensor terminals. Because the humidity sensor directly influences auto-cook functions and sensor cooking modes, a fault in this circuit can cause erratic cooking behavior or a complete shutdown before the E-52 code is displayed.

Diagnosis should begin with a physical inspection of the humidity sensor and its wiring harness. Check the sensor connector for signs of corrosion, burnt contacts, or moisture contamination. If the connector looks intact, use a multimeter to measure the resistance across the sensor terminals and compare the reading against the expected specification. A shorted sensor will typically show near-zero resistance. If wiring continuity checks out but the sensor reads incorrectly, the sensor itself likely requires replacement.