Basic check points for no heating in LG Microwave Oven

1. Is the supply voltage is normal (230V AC) ? 

    Low voltage will lead to non functioning of oven. Please check there is no low voltage  and rated voltage (230V AC) is supplied to oven for working.

2. Is the Microwave oven door closed properly

    If the door is not properly closed, oven will not work. Open the door and check if there is anything stuck  between the door and the cavity. Open and close the door        once and check oven is working or not

3.  Have you used the product for a long time? 

    If the product is used for a longer time, please give a break and use it after some time.

4.  Check the turn table?

    Check that the turn table is placed correctly and can rotate freely. If it is stuck, it may affect heating              

5 . Is proper ventilation is provided around the oven?

    Check the product is not installed in an enclosed area, Make sure to have 10 centimeter distance between  the wall and the product for ventilation.  Check                      ventilation opening is clear If the product is used for a longer time,  Please give a break and use it after  some time.

 

        

How to Resolve LG Microwave Heating Issues

Follow these steps.

Step 1. Reset the Microwave and Check "Demo Mode

Unplug your microwave from the power outlet for 60 seconds to reset the control board. If the microwave turns back on but still won't heat, check if "Demo Mode" is active. On most LG models, you can turn this off by opening the door, pressing and holding the Clear/Off button, and then pressing the Start button or the Number 2 key until the display shows "Demo Off.

Step 2. Clean and Inspect the Door Latches

Wipe down the door hooks and the corresponding slots on the microwave frame with a damp cloth to remove grease and food buildup. Close the door firmly to ensure the safety interlock switches fully engage; if the microwave doesn't detect a tight, secure seal, it will automatically block the internal components from generating heat.

Step 3. Test and Replace Internal Parts

If the settings and door are clear, the issue is a failed internal component—most commonly a burned-out magnetron, high-voltage diode, or thermal fuse. Unplug the microwave, safely discharge the high-voltage capacitor, and use a multimeter to test these parts for continuity, replacing whichever component fails the test.

Above are basic troubleshooting steps you can check on your own, If the issue not solved, product may require service by LG engineer.   You may contact our Customer care center .

  

Frequently Asked Questions (FAQ)

Q. Why is my LG microwave running but not heating?

A. This is usually caused by a tripped Demo Mode, a misaligned door safety switch, or a burned-out internal component like the magnetron or high-voltage diode.

Q. How do I turn off Demo Mode on an LG microwave?

A. Unplug the microwave for 60 seconds to reset it. If that doesn't work, open the door, press and hold Clear/Off, and then press the Start or 2 key until the screen displays "Demo Off.