LG Microwave Error Code F-3

What Does Error Code F-3 Mean on a LG Microwave?

Temperature sensor error — over-temperature detected.

The microwave's cavity temperature sensor has detected an over-temperature condition or has failed.

What Causes Error Code F-3?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

1. 1
   Overheating from blocked vents 50% of cases
2. 2
   Temperature sensor failure 35% of cases
3. 3
   Control board sensor input failure 15% of cases

How to Fix LG Microwave Error Code F-3

1. 1

   Check ventilation

   Ensure the microwave has adequate clearance on all sides. Clean the grille and vent areas.

2. 2

   Allow to cool

   Unplug for 20 minutes.

3. 3

   Test and replace sensor

   If error returns after cooling, sensor has likely failed.

   🔩 LG microwave thermistor ($15–$40)

   ⚠️ DANGER: Microwave capacitors hold lethal charge. Only professionals should open microwave cases.

How to Reset Error Code F-3

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

When to Call a Professional

Same Code on Other Brands

Error code F-3 appears on these other brands too. Click to compare:

Samsung Microwave F-3

Touchpad/membrane failure

GE Appliances Oven F3

Oven temperature sensor open circuit

Haier Refrigerator F3

Defrost sensor failure

Find Replacement Parts

Use these links to find the exact replacement parts for your LG Microwave:

External links — ApplianceErrors.com is not affiliated with these retailers.

Frequently Asked Questions