LG Microwave Error Code E-52

E-52 on an LG microwave indicates a humidity sensor short error. The control board has detected that the humidity sensor circuit has a short condition, meaning the resistance in the sensor or its wiring has dropped below an acceptable level. This causes the microwave to stop normal operation and display the code. The sensor or its associated wiring will need to be inspected and tested to resolve the fault.

It is not recommended to continue using the microwave while E-52 is active. The humidity sensor plays a key role in controlling auto-cook and sensor cooking functions, and a shorted sensor can lead to incorrect cooking times or temperatures. In addition, the underlying fault could indicate a wiring issue that could worsen with continued use. Resolve the error before resuming normal operation.

If only the humidity sensor needs replacement, parts typically range from around $15 to $50 depending on the specific model, with professional labor adding $75 to $150 or more. If the control board is at fault, parts alone can range from $80 to $200 or higher. In some cases, depending on the age and model of the microwave, the total repair cost may approach the price of a new unit, so it is worth comparing repair costs to current replacement prices before proceeding.

A knowledgeable DIYer can perform basic diagnostics such as inspecting the sensor connector for corrosion or moisture and cleaning the sensor area. Using a multimeter to check the sensor's resistance is also a practical DIY step. However, if the sensor or control board needs replacement, comfort with appliance disassembly and electrical safety is required. Microwaves contain high-voltage capacitors that can hold a dangerous charge even after being unplugged, so internal work should only be done by those familiar with high-voltage safety procedures.

Unplugging the microwave for a few minutes and plugging it back in may temporarily clear the E-52 code, but if the humidity sensor or its wiring has a genuine short circuit, the error will return. A reset does not repair the underlying hardware fault. Proper diagnosis and repair of the sensor circuit are necessary to permanently resolve the error.