Oven Not Heating or Not Reaching Temperature: Causes
What's actually happening
There are two quite different complaints hiding under 'not heating': an oven that produces no heat at all, and one that heats but never gets where it should or bakes unevenly. The first points at the heat source — a broken element, or on gas, an igniter too weak to open the valve. The second points at control: the temperature sensor and the control board deciding when to stop. Telling the technician which of the two you have, and whether the broiler still works, narrows the job considerably before anyone arrives.
Check these first — they're free
- Does the broiler work?. Broil and bake use different elements on an electric oven. Broiler fine, bake dead is a strong sign the bake element has failed rather than anything electronic.
- Watch a gas oven light. Turn it on and watch the igniter through the bottom panel. Glowing bright orange for more than 90 seconds without the burner lighting means the igniter is too weak to open the valve.
- Check with an oven thermometer. Set it to 350°F, wait for the preheat tone, and read an independent thermometer on the middle rack after ten minutes. A consistent 25–50°F error is a sensor or calibration issue, not a heating failure.
- Look for a lock icon or an active mode. Sabbath mode, delayed start, and a door still locked after a self-clean all present as an oven that refuses to heat. The display usually says so if you know what to look for.
What causes it, most likely first
Bake element burned out (electric) (most common)
The lower element is visible in the floor of most electric ovens, and a failed one usually shows it — a blister, a split, or a bright scorched spot. The giveaway is that the broiler still works while baking does nothing, because they are separate elements. Replacement is one of the more straightforward oven repairs.
Weak igniter (gas) (most common)
A gas oven igniter has to draw enough current to open the safety valve, and they weaken with age. The result is an oven that takes longer and longer to light, then eventually glows without ever lighting — you can watch it glow orange with no flame. It is the single most common gas oven failure, and it is not a repair to attempt yourself.
Temperature sensor drifted or failed (common)
A thin probe in the oven cavity tells the control how hot it is. As it drifts, the oven runs cold or hot by fifty degrees or more, or shuts off early. This is the usual explanation when baking results have gradually got worse rather than failing suddenly, and it is why an oven thermometer is a genuinely useful thing to own.
Control board or relay failure (common)
The board switches the elements through relays. When one welds shut or stops closing, you get an oven that will not heat, will not stop heating, or heats only in some modes. Error codes on the display, or a mode that works while another does not, point this way.
Still in Sabbath mode, a timed bake, or locked after self-clean (less common, you can fix this yourself)
Ovens have modes that quietly disable normal operation, and self-clean cycles latch the door and can blow a thermal fuse if run too long. Before assuming a failure, check the display for a lock icon or an active timer — this is a real cause and it costs nothing to rule out.
When to call a technician
Electric oven elements carry 240V and gas igniters sit in the burner assembly — both are jobs for a technician. Call as soon as you have confirmed the symptom, and mention whether the broiler works and whether any error code shows, because that often decides which part is brought to the visit. Any smell of gas is not a repair question at all: shut the supply off, ventilate, and call the gas company first.
How long can it wait? An oven that will not heat is an inconvenience rather than a hazard, with two exceptions. An oven that heats without being asked to, or will not switch off, should be shut down at the breaker until it is looked at. And any gas smell needs the utility, not an appliance technician.
What it costs
If you fix it yourself: $0 — cancelling a mode or a timer is the only safe homeowner fix here.
Professional repair: A fixed price after diagnosis, agreed before any work starts; the diagnostic fee is applied to the repair when you approve it.
Frequently asked questions
My oven takes forever to preheat. Is that a failing part?
Usually yes, and which part depends on the fuel. On gas it is typically a weakening igniter — the classic slow decline before it stops lighting entirely. On electric it can be an element failing progressively or a sensor reading high and cutting the heat early. Either way, preheat times that have crept up over months are a fault developing, not the oven getting old.
Everything I bake is burned on the bottom. Related?
That is usually calibration or a sensor issue rather than a heating failure — the oven is running hotter than it says. Check it against an oven thermometer first; a consistent offset can often be corrected in the control settings without any parts.
The oven stopped working right after a self-clean cycle.
Very common. Self-clean runs the cavity extremely hot, and the heat can blow a thermal fuse or damage the control. If the oven went dead immediately after cleaning, mention that when you call — it points straight at the likely part.
Is a control board repair worth it?
It is the most expensive of the common oven parts, so it deserves an honest comparison against the age and value of the range. For a built-in wall oven or a premium range, repair is usually still the better economics; for an older basic freestanding range, we will tell you when it is not.
Codes your machine may be showing
All oven repair services · Related: Dishwasher: not cleaning