Lg Oven Error CF4

⚡ Quick Answer: The LG Oven CF4 error indicates a failure in the right-rear temperature sensor circuit, often resulting in the oven displaying the CF4 code during hea... ✅ DIY Fixable

What Does Error CF4 Mean?

The LG Oven CF4 error indicates a failure in the right-rear temperature sensor circuit, often resulting in the oven displaying the CF4 code during heating or preheating phases. This may lead to the oven not reaching the desired temperature or shutting down unexpectedly. Common symptoms include unusual noises from the convection fan motor or the fan not functioning.

Common Symptoms:

  • Error code CF4 displayed on oven panel during heating or preheat phase
  • Oven may fail to reach set temperature or shut down heating

Possible Causes

  • Open or shorted right‑rear top temperature sensor circuit (medium)

How to Fix Error CF4

DIY Fix Power cycle and visual check

  1. Turn off the oven and disconnect power at the breaker or unplug.
  2. Allow oven to cool fully before inspection.
  3. Visually inspect the right‑rear sensor wiring harness for obvious damage or disconnection.
  4. Restore power and see if error returns.

Technician Only Test and replace faulty right‑rear temperature sensor or wiring

  1. Disconnect power to the oven.
  2. Access the oven’s internal sensor area per model service manual.
  3. Use a multimeter to measure resistance of the right‑rear temperature sensor; compare to expected values per model documentation.
  4. Inspect and repair/replace sensor wiring harness if damaged.
  5. Replace the right‑rear top sensor if open or shorted.
  6. Reassemble and test oven operation.

Parts needed: Right‑rear temperature sensor, Sensor wiring harness/connectors

🛑 When to Call a Pro:
  • If the CF4 code persists after power cycling and visual wiring checks
  • If multimeter testing shows sensor circuit is open/shorted and replacement parts are required
  • If you are uncomfortable working inside the oven or lack proper tools

Technical Specifications

wattage 30W
component Convection Fan Motor
resistance 10-20 ohms
part_number LG 4681W1A2001H
voltage_rating 120V AC

Common Questions

What does CF4 error mean on LG Oven?

The CF4 error indicates a failure in the right-rear temperature sensor circuit, affecting heating.

Can I fix LG Oven CF4 error myself?

Yes, you can power cycle the oven and visually inspect the sensor wiring for damage.

How much does it cost to fix CF4 error?

Repair costs for the CF4 error range from ¥5,000 to ¥20,000, depending on parts and labor.

When should I call a technician for CF4?

Call a technician if the error persists after DIY checks or if replacement parts are needed.

Data last verified: 2026-01-10

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