How to Fix LG Microwave Error COOL

Error Code: COOL Difficulty: Easy

Problem: The microwave is in a cooling cycle. The fan will run until the oven’s temperature drops.

How to Fix COOL Error (Step-by-Step)

1. This is a normal function; no action is required and confirm the error stays cleared during a full test cycle.
2. The microwave has completed a long cooking cycle and is running the fan to cool down its internal components.
3. Allow the cooling cycle to finish on its own. The ‘COOL’ message will disappear from the display.
4. Do not unplug the microwave or try to use it during this brief cooling period.
5. Once the fan stops and the display returns to the clock, the microwave is ready for use.
6. Turn the appliance off, wait about 2 minutes, then turn it back on.
7. Check for simple blockages (lint screen, drain path, or filter) and clean anything you find.

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.