Lg Microwave Error F3

⚡ Quick Answer: The F3 error on LG microwaves indicates a malfunction in the temperature sensing system or control panel circuitry. This error often causes the microw... ✅ DIY Fixable

What Does Error F3 Mean?

The F3 error on LG microwaves indicates a malfunction in the temperature sensing system or control panel circuitry. This error often causes the microwave to stop heating and may display during startup or cooking. If the F3 error persists, it’s essential to check for foreign substances on the touch panel or potential issues with the temperature sensor.

Common Symptoms:

  • F3 error displayed on the microwave screen at startup or during cooking
  • Microwave may stop heating or cease operation when the error appears
  • Error persists after normal operation without clearing

Possible Causes

  • Foreign substances or contamination around touch button panel (medium)
  • Faulty or malfunctioning temperature sensor (thermistor) (medium)

How to Fix Error F3

DIY Fix Clean and inspect control panel

  1. Unplug the microwave from power.
  2. Wipe the touch button panel with a soft, dry cloth to remove possible contamination.
  3. Plug back in and check if the F3 error clears.

DIY Fix Perform power reset

  1. Unplug the microwave from the electrical outlet for at least 5–10 minutes.
  2. Plug it back in and test operation to see if error persists.

Technician Only Inspect and test temperature sensor and wiring

  1. Disconnect power and remove microwave cover.
  2. Locate the temperature sensor/thermistor and check wiring integrity.
  3. Test sensor resistance with a multimeter; replace if out of specification.
  4. Check and secure or replace damaged wiring harnesses.

Parts needed: Temperature sensor/thermistor, Wiring harness/connectors

Technician Only Inspect control board and touch panel circuitry

  1. Visually inspect control board for burnt components or damage.
  2. Test control panel and related circuits for proper operation.
  3. Replace control board or panel if diagnostics indicate failure.

Parts needed: Control board, Touch/control panel assembly

🛑 When to Call a Pro:
  • If the F3 error persists after basic cleaning and reset attempts.
  • If unusual smells, smoke, or signs of electrical damage are observed.
  • If you are not comfortable performing internal diagnostics involving high voltage components.

Technical Specifications

wattage 1000W
component Temperature Sensor
resistance 10-30 ohms
part_number LG EBF49827801
voltage_rating 120V AC

Common Questions

What does F3 error mean on LG microwave?

F3 indicates a malfunction in the temperature sensing system, causing heating failure.

Can I fix LG microwave F3 error myself?

Yes, try cleaning the control panel and performing a power reset.

How much does it cost to fix F3 error?

Repair costs for the F3 error are typically moderate.

When should I call a technician for F3?

Call a technician if the error persists after basic troubleshooting or if you notice unusual smells.

Sources & References

Data last verified: 2026-01-10

User Comments (0)

Share your experience or solution below.

Be the first to comment!