Oven Not Heating to the Right Temperature? Here’s What to Check First

You set the oven to 350°F, come back fifteen minutes later, and the thermometer you keep on the rack says 290°F. Or maybe it shoots past 400°F and keeps climbing. Either way, your roast is in trouble, and you’re wondering if you need to call someone or if this is something you can fix yourself.

I’ve been doing appliance repair for fifteen years, and I can tell you: an oven that won’t hold the right temperature is one of the most common calls we get in Denton, Little Elm, Frisco, and Lewisville. The cause is usually one of two things: the bake element or the oven temperature sensor. Both are replaceable parts, but you need to figure out which one is bad before you start swapping things out. Here’s what you can check safely in about ten minutes, and when you should stop and let a pro handle it.

1. Look at the Bake Element While the Oven Is On

Turn the oven on to 350°F and let it run for five minutes. Open the door and look at the metal heating element at the bottom of the oven cavity. It should be glowing a steady, even orange-red. If you see any dark spots, blisters, or sections that aren’t glowing at all, the bake element is failing. A bad element can’t produce enough heat to reach the set temperature, and it will often cause uneven heating or a temperature that’s consistently low.

What this tells you: A bake element that doesn’t glow evenly is physically damaged. It’s a simple part, usually held in by two screws and a couple of wire connectors. If you’re handy, you can replace it yourself. But here’s the catch: if the element is shorted to the oven chassis, it can blow the main control board when you turn the power back on. That repair jumps from a $40 part to a $400 board. If you see any visible damage, unplug the oven and call S&W Service & Repair LLC before you start pulling wires.

2. Check the Oven Temperature Sensor for Visible Damage

The oven temperature sensor is a thin metal probe that sticks into the back wall of the oven cavity. It looks like a small tube with a wire coming off it. With the oven off and cool, open the door and look at that probe. Is it bent? Is the wire insulation cracked or melted? Is the probe touching the oven wall? Any of those can cause the sensor to send the wrong resistance reading to the control board, which then tells the oven to run too hot or too cold.

What this tells you: The sensor is a thermistor—it changes resistance with temperature. If it’s damaged or out of position, the board gets bad data. A bent probe that’s touching the metal wall will read the wall temperature instead of the air temperature inside the oven. That’s a simple fix: just bend it back so it’s centered in the oven cavity. But if the wire is damaged, you need a new sensor. This is another part you can buy online and swap yourself, but be careful: overtightening the mounting screw can crush the probe and ruin the new part. I’ve seen homeowners do that and end up with the same problem they started with.

3. Run a Self-Test If Your Oven Has One

Many modern ovens from brands like Whirlpool, GE, Samsung, and LG have a diagnostic mode. You can usually enter it by pressing a specific sequence of buttons—often “Bake” and “Broil” held together for three seconds, or “Cancel” and “Start” together. Check your owner’s manual or look up the model number online. Once you’re in diagnostic mode, the oven will run a sensor test and display a code. A code like “F3” or “S” usually points to a bad sensor. A code like “F5” or “E1” often points to a bad bake element or a stuck relay on the control board.

What this tells you: The oven is literally telling you what’s wrong. If you get a sensor code, you can replace the sensor. If you get a relay code, that’s a control board problem—and that’s where you should stop. Replacing a control board is not a DIY job unless you have experience with live electronics and wiring diagrams. One wrong connection and you can fry the new board or start an electrical fire.

4. Check the Oven Door Seal and Hinge

This one is quick and costs nothing. Close the oven door and look all the way around the seal. Is there any gap? Can you see light coming through? A worn-out gasket or a bent hinge lets heat escape, which forces the oven to run longer to try to hold temperature. The result is a temperature that either never reaches the set point or swings wildly as the oven cycles on and off trying to compensate.

What this tells you: A bad door seal is a cheap fix. You can buy a new gasket online for $15 to $30 and install it yourself. But if the hinges are bent or the door is misaligned, that’s a more involved repair. You can try tightening the hinge screws, but if the frame is bent, you’re looking at a door replacement. Don’t force the door shut—that can crack the inner glass, and then you’re buying a whole new door assembly.

When to Stop and Call a Tech

Here’s the honest truth: if you’ve checked the bake element, the sensor, and the door seal, and your oven still isn’t heating right, you’re into control board territory. Control boards are expensive—$200 to $500 depending on the brand—and they’re easy to damage with static electricity or a misconnected wire. I’ve walked into houses where a homeowner tried to replace a board and ended up with a dead oven and a pile of parts they couldn’t return.

The cost of that mistake is a new oven or a $600+ repair bill. So if you’re past the simple checks, call S&W Service & Repair LLC. We handle ovens from Whirlpool, Maytag, GE, LG, Samsung, KitchenAid, Frigidaire, Bosch, Kenmore, Sub-Zero, Wolf, and Viking. We also work with Old Republic Home Protection warranty claims, so if you have a warranty, we can handle the paperwork.

We service all of North Texas, including Denton, Little Elm, Oak Point, Frisco, Lewisville, Highland Village, Flower Mound, The Colony, Krum, Crossroads, and Plano. If you’re not sure what’s wrong, we’ll come out, diagnose it, and give you a straight answer. No upsell, no fluff.

If you want to try the DIY route, check out our washer repair page for more appliance tips—but for oven temperature issues, you’re better off getting a pro involved early. You can contact us to schedule a visit, or just book online and we’ll be there.

Call 940-286-4094 or book at the link above. We’ll get your oven back to the right temperature.