A symptom tells you how the oven is misbehaving, not which part failed. These are the usual causes behind each one; the diagnosis at your home confirms which applies.
Oven Not Heating
The oven stays cold or barely warm, while the cooktop (if it has one) works normally. On a gas oven, look through the window: an igniter that glows but never lights the burner is a different fault from one that doesn't glow at all.
Likely causes
- Gas igniter too weak to open the safety valve, even though it glows
- Bake element burned open on an electric oven
- Hidden bake element failed under the oven floor
- Temperature sensor or control relay fault
- Thermal fuse or high-limit cut-out tripped
How we narrow it down: On gas ovens the igniter's current draw is measured, because an igniter can glow and still be too weak to open the gas valve. On electric ovens the bake element is tested for continuity. The temperature sensor, control relays and any thermal fuse are tested next. The failed part is replaced.
Slow to Preheat
The oven takes much longer than it used to reach temperature. Most ovens take roughly 10 to 15 minutes to reach 350°F, and longer with a convection or large cavity.
Likely causes
- Weak gas igniter delaying ignition
- Bake element failed, so the oven heats on the broil element alone
- Temperature sensor out of range
- Door gasket leaking heat
- Low voltage on one leg of the 240-volt supply
How we narrow it down: Preheat time is measured and both elements or the igniter tested. On electric ovens a failed bake element is a common cause, because the broil element can still bring the oven up slowly. The sensor and door gasket are checked, and the weak part replaced.
Temperature Off: Burning or Undercooking
Food burns at the set temperature or takes far longer than the recipe says. An oven thermometer on the center rack, checked after 20 minutes at 350°F, tells you how far off it is.
Likely causes
- Temperature sensor drifting out of range
- Door gasket worn, letting heat escape
- Weak igniter or failing element causing uneven heating
- Control relay sticking
- Offset setting changed in the control
How we narrow it down: The oven is checked with an independent thermometer over several cycles. The sensor is tested for resistance at room temperature, the gasket inspected, and the igniter or elements checked. Many ovens allow the temperature offset to be adjusted, but only once the parts check good.
Uneven Baking
One side browns faster than the other, or the bottom burns while the top stays pale.
Likely causes
- Convection fan not running
- Bake element or burner partly failed
- Oven not level
- Door gasket gap on one side
- Pans too large for the air to circulate around them
How we narrow it down: The oven is leveled and the convection fan checked. Elements are inspected for hot spots or open sections, and burner flames checked on gas ovens. The gasket is checked for gaps, and the faulty part replaced.
Broiler Not Working
The bake setting works but broil doesn't, or the broiler heats unevenly.
Likely causes
- Broil element burned open
- Broil igniter failed on gas models
- Control relay for the broil circuit failed
- Door left fully closed when the model expects it ajar for broiling (check the manual)
How we narrow it down: The broil element or igniter is tested, and the control output for broil is checked. The failed part is replaced.
Gas Smell from the OvenSafety
A faint smell of gas for a second or two as the burner lights can be normal. A persistent smell, or a smell with the oven off, is not. Don't light anything or flip switches, and don't try to find the leak yourself. Leave the house and call CPS Energy or your gas provider from outside.
Likely causes
- Loose or damaged gas connector behind the oven
- Leaking fitting or valve
- Weak igniter letting gas build up before it lights
- Burner or orifice misaligned
How we narrow it down: Once the utility has made the house safe, every gas joint is leak-tested and the connector checked. Ignition timing is watched to confirm the burner lights promptly. Any joint that's disturbed is leak-tested again before the oven is used.
Element Sparking, Blistered or Glowing in One SpotSafety
A bake or broil element sparks, shows a bright spot, blisters or splits. Turn the oven off at the control and the breaker. A failing element can short to the oven body.
Likely causes
- Element sheath cracked, letting the coil short out
- Spill or cleaner burned onto the element
- Loose or burned terminal at the back wall
- Wiring behind the element damaged by heat
How we narrow it down: The element and its terminals are inspected, and the wiring behind the back wall checked for heat damage. The element is replaced, and any burned terminal or wire is repaired at the same time.
Door Not Closing or Sealing
The oven door won't close flat, hangs unevenly, drops open or lets heat out along one edge.
Likely causes
- Door hinge bent or broken
- Hinge spring broken
- Door gasket torn or flattened
- Door not seated on its hinges after removal for cleaning
How we narrow it down: The door is removed and the hinges and springs inspected. The gasket is checked for gaps. Hinges are replaced in pairs so the door sits evenly.
Door Locked After Self-Clean
The door stays locked after the self-clean cycle has finished, or the lock motor runs without latching. The oven must cool below a set temperature before the lock releases, so wait at least an hour first.
Likely causes
- Oven still too hot for the lock to release
- Lock motor or switch failed
- Control not sending the unlock signal
- Lock stuck mechanically
How we narrow it down: The oven is allowed to cool fully, then the lock motor and switches are tested. If needed, the lock is released manually from behind the control panel. The failed part is replaced.
Self-Clean Won't Start or Stops
The self-clean cycle won't begin, stops partway, or the oven shows an error during cleaning.
Likely causes
- Door lock not engaging
- Temperature sensor reading wrong at high heat
- Thermal fuse tripping from the extreme temperature
- Control fault
How we narrow it down: The lock, sensor and thermal fuse are tested, and the control checked for stored codes. The failed part is replaced. Self-clean runs at very high temperatures, so it can reveal a weak part that was about to fail.
Convection Fan Not Running or Noisy
The convection setting doesn't circulate air, or the fan grinds or squeals.
Likely causes
- Fan motor bearings worn
- Fan blade loose or hitting the cover
- Convection element failed on true-convection models
- Control output for the fan failed
How we narrow it down: The fan is checked for free rotation and noise, the motor tested for power, and on true-convection models the element tested. The failed part is replaced.
Display Blank, Error Code or Keypad Not Responding
The display is blank or flickers, shows an error code, or the keypad ignores some or all buttons.
Likely causes
- Keypad membrane failed
- Temperature sensor fault triggering an error code
- Control board failed
- Control lock activated
- Power surge or outage affecting the control
How we narrow it down: The code is read against the model's service data, and a control lock is ruled out. The sensor and keypad are tested, and the control board replaced only when they check good.
Heats When Turned Off, or Won't Turn OffSafety
The oven keeps heating after being switched off, or heats on its own. Switch it off at the breaker, and keep it off until it's inspected.
Likely causes
- Control board relay welded closed
- Keypad shorted, sending false commands
- Wiring short
How we narrow it down: The control relays are tested and the keypad checked for a short. The failed control or keypad is replaced, and the wiring checked before power is restored.
Smoke While Heating
Smoke when the oven heats, beyond the first use or right after a spill.
Likely causes
- Food or grease on the bottom of the oven or the element
- Residue from oven cleaner
- Insulation touching the element
- Wiring overheating behind the oven
How we narrow it down: The oven interior is checked for residue, and the element and wiring inspected. If smoke comes from behind the oven rather than inside, the wiring and terminals are checked. The damaged part is replaced.
Door Glass Cracked or Shattered
The inner or outer door glass is cracked or has shattered. Stop using the oven: cracked glass can fail completely under heat.
Likely causes
- Impact from a pan or rack
- Thermal shock from cold liquid on hot glass
- Stress from a bent hinge
How we narrow it down: The door is taken apart and the damaged pane identified. Replacement glass is ordered for the model, and the door reassembled with the hinges checked.
Tripping the Breaker
The oven trips its breaker when it heats or when a certain element comes on.
Likely causes
- Bake or broil element shorted to the oven body
- Wiring damaged by heat
- Terminal block at the back burned
- Worn breaker
How we narrow it down: Each element and the wiring are tested for a short to ground. When the trip happens (bake, broil or self-clean) narrows it down. Damaged house wiring or breakers are for a licensed electrician.
Oven Light Out
The oven light doesn't come on.
Likely causes
- Bulb burned out
- Light socket failed
- Door switch or light switch failed
- Control output fault
How we narrow it down: The bulb is checked with an appliance-rated replacement, then the socket and switch tested. The failed part is replaced.
