The recipe says 25 minutes at 350°F. At 25 minutes, the middle is raw and the edges are dark brown. Next time you try 30 minutes at a lower setting, and the cookies come out pale and flat. You start to wonder if it's you, the recipe, or the oven.

Often it's the oven. When your oven temperature is wrong, the dial says one thing and the inside does another. Food burns, stays raw, or bakes unevenly, and no recipe can fix that.

The good news is that you can test it in about 20 minutes, and often correct it yourself. This guide shows you how, and when it's time to bring in a pro through our oven repair service.

Step One: Do the Thermometer Test

Don't trust the preheat beep. It only means the air near the sensor reached the target. The rest of the oven may still be catching up. Here's a better way.

What you need: an oven-safe thermometer. They're cheap and sold at most grocery or kitchen stores.

1. Place the thermometer in the center of the middle rack. Make sure you can read it through the window.
2. Set the oven to 350°F and let it preheat.
3. Wait 15 to 20 minutes after the beep. This lets the temperature settle.
4. Read the thermometer without opening the door, if you can see it. If not, open the door quickly and check.
5. Check again every 10 minutes, for about 30 minutes total. Write down each reading.
6. Find the average. Ovens cycle on and off, so the temperature moves up and down.

Now compare that average to 350°F.

How Far Off Is Too Far?

A little variation is normal. Ovens heat in cycles, so they swing above and below the set point.

• Within about 10 to 15°F: normal. No action needed.
• Around 15 to 25°F off, every time: common. You can adjust or recalibrate.
• More than 25°F off: worth fixing. A part may be worn.
• 50°F or more off, or swinging wildly: get it checked. That points to a failing part.
• Hotter than the setting by a lot: turn it off and call for service. That can be a safety problem.

Quick Fix: Recalibrate Your Oven

Many modern ovens let you adjust the temperature offset. If yours is consistently off by the same amount, this is the easiest fix.

How it works: you tell the oven to "read" a certain number of degrees hotter or cooler. Most ovens allow an adjustment of around 30 to 35°F in either direction.

The steps vary by brand, so check your manual. In general:

1. Find the calibration or offset setting in the control panel menu. On some ovens, you hold the Bake button for a few seconds.
2. Enter the difference. If your oven runs 20°F too cool, add 20°F.
3. Save it, then test again with your thermometer.

If your manual doesn't mention calibration, or the adjustment doesn't help, the problem may be a part. Keep reading.

How Much Does Appliance Repair Cost?

Rule Out Cooking Habits First

Sometimes the oven is fine, and the problem is how it's used. Check these before you blame a part.

• Opening the door. Each peek can drop the temperature by 25°F or more. It then takes minutes to recover.
• Rack position. Food on the top rack browns faster. Food on the bottom gets more direct heat.
• Dark pans. Dark metal absorbs heat and browns the bottom. Light pans reflect it.
• Glass or ceramic dishes. They hold heat longer. Many recipes suggest lowering the temperature by about 25°F.
• Convection settings. A fan cooks faster. Recipes often call for a 25°F lower setting or less time.
• Crowded oven. Too many pans block airflow.
• Not enough preheat. Start only after the oven has fully heated.

If food still cooks wrong after you fix these, look at the oven itself.

Why Is My Oven Temperature Wrong?

Here are the most common causes inside the oven.

A Faulty Temperature Sensor

This is the top cause. The sensor is a thin metal rod, usually at the back of the oven. It tells the control board how hot it is. If it drifts or fails, the oven reads the wrong temperature. Then it heats too much or too little.

Clues:

• The oven is off by a steady amount every time
• Wide temperature swings
• The sensor looks bent, dirty, or is touching the oven wall
• Some ovens show an error code related to the sensor

Fix: The sensor can be tested and replaced. A technician can check its resistance with a meter. If it's only dirty, a gentle wipe may help, but never bend it.

A Weak Heating Element or Igniter

Electric ovens use a bake element. Gas ovens use a burner with an igniter. When these weaken, the oven heats slowly or can't reach the set temperature.

Clues:

• The oven takes much longer than usual to preheat
• It never quite reaches the target
• Food cooks slowly and unevenly

Fix: A pro can test the element or igniter. Gas parts should always be handled by a technician.

A Damaged Door Gasket or a Door That Won't Seal

The rubber seal around the door keeps heat in. If it's torn, loose, or missing, heat escapes, and the oven can't hold its temperature.

Clues:

• Heat leaking around the door edges
• Visible cracks or gaps in the gasket
• A door that doesn't close flush

Fix: A worn gasket can be replaced.

A Failing Control Board or Thermostat

On older ovens, a mechanical thermostat controls the heat. On newer ones, a control board does. If either fails, the oven can run too hot, too cool, or swing up and down.

Clues:

• Random temperature changes
• Display problems or buttons that act up
• Burned food even when the sensor and the element test fine

Fix: This needs professional testing. It's best to get a diagnosis before you pay for a new board.

A Broken Convection Fan

In convection ovens, the fan moves hot air around. If it fails, the oven develops hot and cool spots, and baking comes out uneven.

Clues:

• Odd noises from the fan
• The fan doesn't spin
• Uneven browning

Fix: Have it checked and replaced if needed.

Gas Supply Problems (Gas Ovens)

Low gas pressure, a bad regulator, or a dirty burner can stop a gas oven from reaching full heat. If you ever smell gas, leave the home and call your gas utility from outside. Don't try to repair gas parts yourself.

Buildup of Grease and Spills

Heavy grease or burned-on food can coat the sensor or block vents. It can also cause smoke and strange smells. Cleaning on a regular basis helps, but follow your manual, and avoid spraying cleaners on the sensor.

Signs Your Appliance Warranty Repair Isn't Being Done Right 

Too Hot or Too Cool? Clues That Point to the Cause

Oven runs too hot:

• Food burns on the outside and stays raw inside
• The sensor may be reading cool, so the oven keeps heating
• A control board or thermostat issue is possible

Oven runs too cool:

• Food takes much longer than the recipe says
• Weak element or igniter
• Leaking door gasket

Swings up and down:

• Sensor drift or a failing control

These are clues, not a diagnosis. A technician can confirm.

What Not to Do

• Don't open the back or control panel while the oven is plugged in or connected to gas.
• Don't bend or move the temperature sensor. It needs to sit in the right place.
• Don't use an oven that runs far too hot. It's a fire and burn risk.
• Don't ignore the gas smell. Leave and call the gas company.
• Don't keep adjusting the setting by guess. Test with a thermometer first, then adjust.

When to Call a Pro

Call a technician if:

• The oven is more than 25°F off even after you recalibrate
• The temperature swings widely
• It takes far longer than usual to preheat
• It runs much hotter than the setting
• You see an error code you can't clear
• You smell gas or burning
• The display, buttons, or fan act up

Repair or Replace?

Most oven problems are worth repairing, especially for ovens under about 10 to 15 years old. A sensor, element, or gasket costs much less than a new range. If your oven is old and needs several parts, replacing it may make more sense. Our guide Repair or Replace? How to Decide When an Appliance Breaks Down can help you decide.

How We Can Help

Our technicians can test your oven's real temperature, find the faulty part, and fix it. Through our oven repair service and stove repair service, we can:

• Check the sensor, element, igniter, and control board
• Recalibrate the oven properly
• Replace worn door gaskets and fans
• Check gas connections safely
• Use manufacturer-approved parts

We repair ovens and ranges from major brands, including General Electric, KitchenAid, Frigidaire, Samsung, Bosch, Jenn-Air, Viking, and Thermador. We offer same-day service.

Call us at (844) 332-1026, request a callback, or get a quote online.

Frequently Asked Questions

Q: How do I know if my oven temperature is accurate?
A: Place an oven-safe thermometer in the center of the middle rack, preheat to 350°F, wait 15 to 20 minutes, and compare readings.

Q: How much can an oven be off and still be normal?
A: Within about 10 to 15°F is typical, because ovens cycle on and off. A steady difference of 25°F or more is worth fixing.

Q: Can I recalibrate my oven myself?
A: Often yes. Many ovens have an offset setting in the control panel. Check your manual for the exact steps.

Q: What causes an oven to run too hot?
A: A faulty temperature sensor, a bad control board or thermostat, or a stuck relay. If it runs far above the setting, turn it off and call for service.

Q: Why does my oven take so long to preheat?
A: It could be a weak heating element or igniter, a bad sensor, or a leaking door gasket.

Q: Why is my food burning on the bottom?
A: Check the rack position and pan type first. Dark pans and low racks brown bottoms faster. If it keeps happening, the oven may be running hot.

Q: Does a dirty oven affect temperature?
A: It can. Heavy grease can coat the sensor and block vents. Clean it as your manual advises, and avoid spraying the sensor.

Q: Is it worth fixing an inaccurate oven?
A: Usually, yes. Many fixes are simple and cost much less than a new oven.

Final Thoughts on an Inaccurate Oven

You can't bake well in an oven you can't trust. Before you blame yourself or the recipe, run the thermometer test. It tells you whether the oven is really off and by how much.

If the difference is small and steady, a quick recalibration may solve it. If it's large, swinging, or paired with slow preheating, a part has likely worn out. Reliable Appliance Service is available 24/7 at (844) 332-1026.