ProBake error

This step-by-step repair guide walks you through fixing probake error on your LG LWS3063ST (Wall Oven). With the right tools and parts, most homeowners can complete this repair in 1–2 hours and avoid a costly service call.

Part of our Top 20 Oven Models & Common Repair Issues Guide. Browse all oven repair guides for related models and issues.

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Common Symptoms & Causes

If your LG LWS3063ST is displaying a ProBake error, you may notice one or more of the following symptoms before or during the malfunction.

The oven display shows a “F3” or “F9” error code during or after a ProBake cycle
The bottom heating element fails to activate when ProBake mode is selected
Oven temperature fluctuates significantly or never reaches the set temperature
The oven shuts off unexpectedly mid-cycle while ProBake is enabled

These issues are most commonly caused by a faulty bottom bake element, a failed temperature sensor, or a worn control board that can no longer regulate the ProBake heating cycle correctly.

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Safety First

Unplug the oven from the power outlet before starting any repair — never work on a live appliance.
Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
Take photos with your phone before disconnecting any wiring harnesses or connectors.
Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

Phillips #2 screwdriver
¼” nut driver
Multimeter
Work gloves (heat-rated)
Flashlight

Replacement Parts

Step-by-Step Repair Instructions

Step 1

Disconnect power at the breaker before doing anything else — LG’s ProBake system moves the heating element to the oven floor and pairs it with a convection fan to circulate heat evenly, so when ProBake fails the most likely culprits are that bottom element or the fan motor. Keeping power off throughout protects you from shock and prevents the control board from logging false fault codes during testing.

Step 2

Remove the oven floor panel by backing out the 2 Phillips screws, then disconnect the bottom element’s wire harness and set your multimeter to Rx1 to test continuity across the element terminals. A reading of open (no continuity) means the element has burned through and must be replaced — a broken element is the single most common cause of ProBake failure and is often visible as a crack or blister on the element surface.

Step 3

Pull the oven’s back interior panel (4 Phillips screws accessed from inside the oven cavity) to reach the convection fan motor, then spin the fan blade by hand to feel for binding or seizure, which indicates a failed bearing. If the blade spins freely, test the motor windings on Rx1 — no continuity confirms a burnt winding and the motor needs replacement; a seized blade alone is enough to replace it without further testing.

Step 4

Locate the temperature sensor on the oven’s back wall, remove its 2 Phillips screws, and disconnect the harness to pull it free for testing. At room temperature (around 70°F) a good sensor reads approximately 1,080 ohms on Rx1 — a reading significantly above or below that range means the sensor is feeding the control board bad data, causing ProBake to heat incorrectly or shut down, and the sensor should be replaced.

Step 5

Reassemble all panels, restore power, and run a ProBake cycle set to 350°F with a calibrated oven thermometer placed at multiple rack positions to verify even heat distribution. Temperature should hold close to 350°F consistently across all positions — if hot or cold spots remain after replacing the faulty component, recheck that the convection fan blade is seated correctly on the motor shaft and spinning freely, as even slight imbalance disrupts airflow.

Where to Buy Replacement Parts

Find genuine OEM and aftermarket replacement parts for your LG LWS3063ST (Wall Oven) on Amazon:

When to Call a Professional

If the issue persists after completing all steps above, the problem may involve the sealed refrigerant system, a failed main control board, or wiring that requires specialized diagnostic equipment. Contact a licensed appliance technician — attempting sealed-system repairs without EPA 608 certification is illegal and unsafe.

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How Much Does This Repair Cost?

DIY parts for fixing a ProBake error on the LG LWS3063ST typically run between $20–$150, depending on whether you need a temperature sensor, control board, or heating element. A professional service call usually costs $150–$300 once you factor in labor and diagnostic fees. Tackling this repair yourself can save you $100 or more.

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Frequently Asked Questions

What does the ProBake error mean on my LG LWS3063ST?

The ProBake error indicates a fault with the oven’s bottom heating element or its associated control circuit. It typically means the element is not reaching or maintaining the correct temperature during the ProBake convection cycle.

Can I still use my wall oven while troubleshooting the ProBake error?

It is best to avoid using the oven until the issue is resolved, as a faulty heating element can cause uneven cooking or pose a safety risk.

Do I need a technician to fix the ProBake error, or is it a DIY repair?

Replacing the heating element on the LG LWS3063ST is a manageable DIY repair for confident homeowners, but if the control board is faulty, professional service is recommended.

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