How to Fix LG Microwave Error F5

Error Code: F5 Difficulty: Hard

Problem: There is a damper switch error. It can also indicate a problem with the humidity sensor.

How to Fix F5 Error (Step-by-Step)

1. Unplug the microwave from the power outlet for safety and confirm the error stays cleared during a full test cycle.
2. Remove the screws holding the outer cabinet of the microwave, which are typically located on the back and sides.
3. Slide the cabinet off to access the internal components. Be careful of sharp edges.
4. Locate the vent damper assembly, usually found near the top vent area. It’s a small door that opens and closes.
5. Inspect the damper for any physical obstruction or damage. Check the wiring connected to the damper’s microswitch for loose or burnt connections.
6. If the switch or damper assembly appears faulty, disconnect the wires and remove the mounting screws to replace it with the new part.
7. Reassemble the microwave cabinet, plug it in, and test its operation.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

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