You set the oven to 350°F, walk away for twenty minutes, and come back to find dinner still cold. The display is on. The clock is running. Everything looks fine, but the oven clearly isn’t doing its job.
This is one of the most frustrating appliance problems homeowners in Greenville and the Upstate run into, because the oven appears to be working right up until it doesn’t. The good news: most heating problems follow a predictable pattern. Match the symptom to the likely cause, do a few safe checks, and you’ll know whether this is a quick fix or a job for a certified technician.
This guide covers three common scenarios:
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Oven turns on but stays cold (no heat at all)
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Oven heats slowly or takes forever to preheat
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Oven cooks unevenly or runs hotter or cooler than the set temperature
Key Takeaways
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Symptom first, parts second. The most likely cause depends on what the oven is doing (or not doing), not just the fact that it stopped heating well.
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Electric and gas ovens fail differently. Electric ovens most often lose heating because of a failed bake element or a power supply problem. Gas ovens most often fail because of a weak or dead igniter.
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A working display doesn’t mean full power. An electric oven can light up, show the set temperature, and still not heat if it isn’t receiving the full 240 volts it needs at the terminal block.
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A gas igniter can glow and still be too weak. If it takes longer than about 90 seconds to ignite the gas, the igniter is failing even if it still produces an orange glow.
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Slow or uneven heating is a different problem than no heat. A drifting temperature sensor, a partially failed element, or a worn door seal can all cause weak or inconsistent cooking without completely killing the heat.
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Stop before gas or live voltage. Checking the breaker, inspecting visible elements, and using an oven thermometer are safe homeowner steps. Anything beyond that is a job for a technician.
If Your Oven Turns On but Stays Cold, Start Here
Complete loss of heat is the clearest symptom, and it usually points to one of a handful of causes. Which one depends on whether you have an electric or gas oven.
| Electric Oven | Gas Oven | |
|---|---|---|
| Most likely cause | Failed bake element or loss of full 240V power | Weak or failed igniter |
| What you’ll see | Display works, oven stays cold; element doesn’t glow red | Clicking or no ignition sound; oven stays cold; possible faint gas smell before lighting |
| Second suspect | Blown thermal fuse | Faulty safety gas valve (caused by a weak igniter) |
| Third suspect | Control board failure | Spark module failure (spark ignition models) |
| Safe homeowner check | Check breaker; inspect element visually for cracks or blisters | Watch the igniter glow; if it takes more than 90 seconds to ignite, it’s too weak |
| Call a tech when | Breaker is fine and element looks intact | Any gas smell, or igniter diagnosis is needed |
The 240V issue most homeowners miss
Electric ovens run on 240 volts, not the standard 120V outlet you plug a lamp into. If only one leg of that circuit trips or fails, the oven can still power its display, clock, and interior light, but the heating elements get nothing.
This is why an oven can look completely normal and still not heat at all.
Check your breaker panel first. Look for a double-pole breaker (it takes up two slots) labeled for the range or oven. If it’s tripped, it will sit in the middle position rather than fully on or off. Reset it fully, then test the oven. If it trips again immediately, stop and call a technician.
The igniter problem in gas ovens
A gas oven igniter has two jobs: it glows hot enough to light the gas, and it draws enough current to open the safety valve that lets gas flow. A weak igniter can still glow, but if it isn’t drawing enough current, the valve never fully opens and the oven never lights.
Watch the igniter when you turn the oven on. A healthy igniter should glow bright orange or white and ignite the gas within about 90 seconds. If it glows dimly, takes longer, or cycles without igniting, the igniter is the likely culprit. This is a repair for a certified technician, especially since it involves working near the gas supply line.
If It Heats Slowly or Cooks Unevenly, the Problem Is Usually Different
Slow preheating and uneven cooking are a different category of problem. The oven is heating, just not well enough or not consistently. These symptoms point to different suspects than a complete no-heat failure.
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Slow preheat on a gas oven often means the igniter is weakening. It still lights, but it’s struggling to open the gas valve fully, so the burner runs at reduced output. You might not notice until preheat starts taking 20 or 30 minutes instead of 10.
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Uneven heating or hot spots in an electric oven can mean the bake element is partially failed. One section burns out while the rest still glows, so you get heat, but it’s lopsided. Food on one side of the rack overcooks while the other side lags behind.
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Temperatures that run consistently high or low often point to a drifting temperature sensor or a calibration issue. The sensor is a thin probe mounted inside the oven cavity, usually near the top rear wall. If it’s bent and touching the wall, or if it’s drifting out of spec, the oven control board gets inaccurate readings and adjusts heat incorrectly. A sensor that’s off by more than 25°F typically needs repositioning or replacement.
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Heat escaping from the door is easy to overlook. A worn or damaged door gasket lets heat leak out continuously, which forces the oven to cycle more often and still never quite reach the right temperature. You can feel this by carefully holding your hand near the door edge while the oven is on.
Quick test: Put an inexpensive oven thermometer on the center rack, set the oven to 350°F, and check it after 20 minutes. If the reading is more than 25°F off from the set temperature, you have a calibration or sensor issue worth investigating before assuming a bigger problem.
Safe Checks You Can Do Before Calling for Service
These are the checks worth doing yourself. They don’t require disassembly, live voltage testing, or working near gas lines.
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Reset the breaker. Go to your electrical panel and find the double-pole breaker for the range or oven. Flip it fully off, then back on. If it trips again right away, stop and call a technician.
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Inspect the bake and broil elements visually. With the oven off and cooled down, look at both elements for visible damage: cracks, blisters, burn holes, or sections that look separated. A damaged element is a clear indicator it needs replacement. Don’t touch it while the oven is or has recently been on.
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Check the temperature sensor position. Look inside the oven at the thin probe near the back wall. It should be straight and not touching the oven interior. A sensor resting against the wall can read falsely high and cause the oven to under-heat. Gently reposition it if needed.
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Test with an oven thermometer. This one simple tool eliminates a lot of guesswork. A reading more than 25°F off from the set temperature confirms a sensor or calibration issue rather than an element failure.
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Check the door gasket. Run your fingers along the rubber or silicone seal around the oven door. If it’s torn, hardened, or pulling away from the frame, heat is escaping. Replacement gaskets are available for most major brands.
If you’ve run through all five and the oven still isn’t heating correctly, it’s time to call a certified oven repair technician rather than continue guessing at parts.
When to Stop Troubleshooting and Call a Technician
Hard stop: If you smell gas at any point, don’t continue troubleshooting. Leave the house, don’t use any switches or open flames, and call your gas provider immediately.
Beyond the gas smell scenario, here are the situations where professional diagnosis is the smarter move:
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You smell gas during or after attempting to light the oven
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The breaker trips again immediately after you reset it
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You see arcing, burn marks, or scorching around the control panel or terminal connections
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The oven display shows error codes that persist after a power reset
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You’ve confirmed the breaker is fine and the elements look intact, but the oven still won’t heat
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The igniter glows but won’t ignite the gas within about 90 seconds
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Any repair requires removing the back panel, accessing the control board, or working with the gas supply line
These are not DIY checks. Control board diagnosis, relay testing, live-voltage verification at the terminal block, and igniter replacement all require the right tools and training. Guessing parts on a modern oven with an electronic control board can get expensive fast.
If you’re in Greenville or the Upstate and the oven is still not heating after the safe checks above, our stove and oven repair service can diagnose the actual cause and get it fixed right the first time. We’re factory authorized across 25+ major brands, including Samsung, LG, Whirlpool, GE, and Bosch.
FAQ
Can an oven have power but still not heat?
Yes, and this is one of the most common sources of confusion. Electric ovens require 240 volts across two circuit legs. If one leg trips at the breaker, the oven can still power its display, clock, and interior light on the remaining 120 volts, but the heating elements receive no power at all. Always check the breaker before assuming the oven itself is faulty.
My gas igniter glows but the oven still won’t light. Is the igniter bad?
It can be. A gas igniter that glows but takes longer than about 90 seconds to ignite the gas is too weak to fully open the safety valve, even though it looks like it’s working. Dim or slow-glowing igniters are a classic sign of a failing part. A technician can confirm this with a simple current draw test.
Can a bad temperature sensor cause my oven to underheat?
Yes. The temperature sensor tells the control board how hot the oven actually is. If the sensor is reading falsely high, the control board thinks the oven has already reached the target temperature and stops calling for more heat, leaving your food undercooked. A sensor touching the oven wall, or one that has drifted out of spec, can cause exactly this problem.
Is it worth repairing an older oven that won’t heat?
Usually yes, if the repair involves a single component like a bake element, igniter, or temperature sensor. These are relatively affordable parts with straightforward replacements. The calculus changes if the control board has failed on an older unit, since board replacements can run higher and parts availability can become an issue on older models. A good technician will give you an honest estimate so you can make that call. Our appliance age finder can also help you figure out how old your oven actually is before committing to a repair.
Bottom Line
Most oven heating problems aren’t mysterious once you know what symptom to look for. No heat at all usually means a power problem or a failed element or igniter. Slow or uneven heating usually means a weakening igniter, a partial element failure, a drifting sensor, or a leaking door seal. Start with the symptom, do the safe checks, and stop before you get into gas lines or live voltage.
If you’re in the Greenville area and the oven still isn’t heating after working through the steps above, contact Appliance GrandMasters for a professional diagnosis. We’re factory authorized across 25+ major brands and were recognized as the 2026 UASA Most Professional Servicer, so you’re getting a technician who actually knows your oven’s brand, not just a general handyman with a multimeter.