Oven temperature off by 50°F

This step-by-step repair guide walks you through fixing oven temperature off by 50°f on your LG LRG4115ST (Gas Range). 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

These signs point to an oven temperature calibration problem on your LG LRG4115ST gas range.

Baked goods are consistently undercooked or overcooked at standard recipe temperatures
A thermometer placed inside the oven reads 50°F lower or higher than the set temperature
The oven takes noticeably longer than normal to preheat to 350°F
Broiling or roasting results in unevenly cooked food despite correct rack placement

This issue is most commonly caused by a faulty oven temperature sensor (RTD sensor) that has drifted out of spec over time, or a control board that is misreading the sensor’s resistance signal.

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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

Place an oven thermometer in the center of the oven, run Bake at 350°F for 30 minutes, and record the thermometer reading. This establishes your true baseline temperature, since the oven’s built-in display cannot reveal its own inaccuracy. Pro tip: avoid opening the door during the test, as heat loss will skew your reading.

Step 2

If the actual temperature is more than 25°F off from the set point, the oven temperature sensor is the most likely culprit and should be tested before assuming a calibration issue. Locate the sensor on the oven back wall, remove the 2 Phillips screws, and check its resistance with a multimeter — at room temperature (~70°F) a healthy sensor reads approximately 1,080Ω; a reading significantly outside that range means the sensor is drifting and sending the control board bad data. Safety note: ensure the oven is fully powered off and cooled down before handling the sensor.

Step 3

If the sensor tests within spec, the issue is a calibration offset stored in the control board, which you can correct without any parts. Press and hold the Bake button for 5 seconds to enter calibration mode, then use the +/- arrow keys to dial in an offset equal to your measured error — for example, if the oven runs 40°F too low, enter +40°F. This offset is saved in non-volatile memory, so it will persist through power cycles.

Step 4

The LG LRG4115ST allows a maximum calibration offset of ±35°F, which covers most normal sensor drift and installation variation. If your measured error exceeds 35°F and replacing the sensor does not bring the error within that window, the control board itself is miscalibrating the sensor signal and must be replaced. At that point, further calibration adjustments will not be sufficient to compensate for faulty board logic.

Step 5

After saving any calibration change, repeat the full thermometer test — run Bake at 350°F for 30 minutes and confirm the actual temperature is within ±10°F of the set point. This verification step is critical because it confirms the offset was saved correctly and that no secondary issue is masking the problem. If the result is still outside ±10°F, revisit sensor resistance and recheck all wire harness connections at the sensor and control board.

Where to Buy Replacement Parts

Find genuine OEM and aftermarket replacement parts for your LG LRG4115ST (Gas Range) 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 this repair, typically a replacement oven temperature sensor, run $20–$50 for the LG LRG4115ST. A professional service call for the same fix generally costs $150–$300 once you factor in labor and diagnostic fees. Tackling this repair yourself can save you $100–$250 or more.

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Frequently Asked Questions

How do I know if my LG LRG4115ST oven temperature is actually off by 50°F?

Place an oven-safe thermometer in the center of the oven and compare its reading to the set temperature after 20 minutes. A consistent 50°F difference confirms calibration is needed.

Can I recalibrate the oven temperature myself without a technician?

Yes, the LG LRG4115ST allows user calibration through the settings menu, adjustable up to 35°F in either direction. Larger offsets may require professional sensor inspection.

What part most commonly causes a 50°F temperature offset on this model?

A faulty oven temperature sensor (RTD sensor) is the most common culprit. Replacing it is a straightforward repair that typically restores accurate temperature readings.

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