my oven temperature is way off, everything burns or is undercooked even when i set it right

Diagnosis

The Frigidaire Gallery GCRE3060AF utilizes a Platinum RTD (Resistance Temperature Detector) sensor to monitor internal heat. When your food is consistently burning or undercooking despite the digital display showing the correct temperature, it indicates a "temperature drift" or a failure in the sensor's resistance curve. Essentially, the control board is receiving an electrical signal that doesn't accurately reflect the actual thermal state of the oven cavity, causing the heating elements to either overshoot the target or shut off prematurely. This issue is often caused by the sensor probe becoming coated in carbonized grease or food splatter, which acts as an insulator and slows the sensor's response time. Alternatively, the sensor may have physically shifted or warped, moving it too close to the rear heating element, which creates a "hot spot" reading that tricks the board into thinking the oven is hotter than it actually is. To confirm this, you must perform a manual temperature verification using a calibrated analog or digital oven thermometer placed on the center rack, as the built-in sensors cannot diagnose their own inaccuracy.

How to Fix It

To resolve this, you must first determine the exact variance and then apply a digital offset via the control panel.

1. Place a standalone oven thermometer on the middle rack in the center of the oven. Ensure the thermometer does not touch the oven walls or the rack itself.
2. Set the oven to 350°F and allow it to preheat fully. Once it reaches temperature, let it stabilize for at least 20 minutes to ensure the oven walls have absorbed the heat.
3. Read the thermometer. If the thermometer reads 370°F, your oven is running 20°F hot. If it reads 330°F, it is 20°F cold.
4. Press and hold the Bake button for approximately 6 seconds. The display will change from the current temperature to "CAL" (Calibration mode).
5. Use the + (Plus) or - (Minus) buttons to adjust the temperature offset. If your oven was 20°F too hot, press the minus button until the display shows -20. If it was too cold, press plus until it shows +20.
6. Press the Bake button again or wait 30 seconds for the setting to save. The display will return to the normal clock or temperature screen.
7. Rerun the thermometer test to verify the adjustment has corrected the internal temperature.

If That Didn't Work

• Replace the Oven Temperature Sensor: If the calibration offset exceeds 50°F or if the temperature fluctuates wildly, the sensor (Part #5303910501) has likely failed. Access the sensor at the back upper-right corner of the oven cavity. Unscrew the two mounting screws, pull the sensor forward, and disconnect the wiring harness from the back of the chassis. Install a new sensor and ensure the probe is straight and not touching the oven wall.
• Inspect the Bake Element: Check for "hot spots" or blistering on the bottom bake element. If the element is warped or has a localized area of extreme heat, it can cause uneven cooking and confuse the sensor. If you see visible pitting or a bulge in the coil, replace the element.
• Verify Door Gasket Seal: Inspect the fiberglass insulation and the rubber gaskets around the oven door. If the seal is torn or compressed, heat escapes from the top or sides, causing the sensor to keep the elements on longer than necessary, which often leads to burnt bottoms and undercooked tops.
• Test the Control Board (ERC): If the oven ignores calibration settings or displays an "F" error code (like F10), the Electronic Range Control board may have a faulty relay. This prevents the board from correctly cycling the elements off, regardless of what the sensor reports.

Heads Up

• Avoid using "Self-Clean" cycles excessively, as the extreme heat (900°F+) can degrade the sensor's accuracy over time or warp the sensor probe.
• Never touch the sensor probe with abrasive scouring pads or chemicals; this can strip the protective coating and lead to premature failure.
• Always ensure the oven is completely cool before attempting to replace the sensor or heating elements to avoid electrical shock or burns.
• If you use a pizza stone or heavy cast iron inside the oven, remember that these absorb massive amounts of heat and may require a higher calibration offset for consistent results.