Lg Oven Error F21

⚡ Quick Answer: The LG oven error code F21 indicates a potential malfunction within the heating element, which may lead to improper heating or unusual sounds during o... ✅ DIY Fixable

What Does Error F21 Mean?

The LG oven error code F21 indicates a potential malfunction within the heating element, which may lead to improper heating or unusual sounds during operation. To troubleshoot, first ensure the oven door is fully closed and then power cycle the unit by disconnecting it from the electrical supply for 1–2 minutes before restoring power. If the error persists, further inspection of the oven sensor wiring and control connections may be necessary.

Possible Causes

  • Heating Element
  • Wiring Issues
  • Control Board Malfunction

How to Fix Error F21

DIY Fix General basic checks and reset

  1. Ensure the oven door is fully closed.
  2. Turn off the oven and disconnect power at the wall or circuit breaker.
  3. Wait at least 1–2 minutes and restore power.
  4. Observe if the F21 code returns when powering on.

Technician Only Inspect oven sensor wiring and control connections

  1. Check wiring harnesses to the temperature sensor and control board for loose or damaged connectors.
  2. Using a multimeter, verify continuity and proper resistance of the temperature sensor against manufacturer specifications.
  3. Inspect control board connectors for signs of burn marks or corrosion and reseat or replace as needed.

Parts needed: temperature sensor, wiring harness, control board

🛑 When to Call a Pro:
  • If the error persists after power cycling.
  • If any wiring appears burnt, frayed, or damaged.
  • If temperature readings from the oven sensor do not fall within expected ranges.

Technical Specifications

wattage 3000W
component Heating Element
resistance 10-30 ohms
part_number LG EBF49827801
voltage_rating 240V AC

Common Questions

What does F21 error mean on LG oven?

F21 indicates a malfunction in the heating element, resulting in improper heating.

Can I fix LG oven F21 error myself?

Yes, start by ensuring the oven door is closed and power cycling the unit.

How much does it cost to fix F21 error?

Repair costs vary; expect moderate costs for wiring or sensor, and higher for control board replacements.

When should I call a technician for F21?

Call a technician if the error persists after a power cycle or if wiring appears damaged.

Sources & References

Data last verified: 2026-01-10

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