Display works but oven stays cold
Lights, clock, and controls respond, but the cavity never starts warming.
Start here: Start with settings and power, then check whether the bake heat source comes on at all.
Oven heating problem
Bosch Oven Not Heating
Direct answer: If your Bosch oven is not heating, start with the basics: make sure it is actually in a bake cycle, the door is fully closed, and the unit has full power. After that, the most common causes are a failed oven heating element on electric models, a weak oven igniter on gas models, or an oven temperature sensor that is reading wrong.
Most likely: Most of the time, the clue is the heating pattern. Electric ovens often show a bake element that stays dark or damaged. Gas ovens often click or glow but never light the burner. If the oven heats a little but never reaches temperature, the oven sensor moves up the list.
Separate the problem early: dead cold, heats a little, broil works but bake does not, or one cavity on a double oven is the only one acting up. That keeps you from chasing the wrong part. Reality check: a lot of no-heat calls end up being a setting, power, or single failed heating part, not a major electronic failure. Common wrong move: replacing the oven sensor just because the temperature seems off when the real problem is a weak igniter or a burned bake element.
Don’t start with: Do not start by ordering an oven control board. Controls do fail, but they are not the first bet when the oven is dead cold or heating weakly.
Dead cold ovenCheck the bake setting, door closure, and whether broil works before opening anything.
Heats weakly or unevenlyWatch the first few minutes of a preheat to see whether the bake heat source actually comes on.
Last reviewed: 2026-04-17
What kind of no-heat problem do you have?
Broil works but bake does not
The upper heat works, but baking leaves food raw and the oven will not preheat normally.
Start here: Go straight to the bake-side heating check. On electric ovens, suspect the oven bake element. On gas ovens, suspect the oven igniter.
Oven heats, but very slowly
It eventually gets warm, but preheat drags on or never reaches the set temperature.
Start here: Watch for a weak igniter on gas models or a sensor issue if the heat source does come on but temperature is off.
Only one oven cavity will not heat
On a double oven, the upper or lower cavity is the only one failing.
Start here: Treat that cavity as its own problem first. If the other oven works normally, house power is less likely and the failed cavity parts move up the list.
Most likely causes
1. Wrong mode, delayed start, or door not fully closed
The control looks alive, but the oven never actually begins a bake cycle. This is more common than people think after cleaning, power flickers, or accidental setting changes.
Quick check: Cancel the cycle, set a simple bake temperature, confirm no timer or delay mode is active, and close the door firmly.
2. Partial power or supply issue
An electric oven can have lights and a working display but still miss the full power needed for heating. A gas oven may have control power but no usable burner ignition.
Quick check: See whether the cooktop and broil functions behave normally, and check for a tripped breaker or recent power interruption.
3. Failed oven heating element or weak oven igniter
This is the main no-heat hardware failure. Electric bake elements burn open or blister. Gas igniters can glow and still be too weak to open the gas valve.
Quick check: During preheat, look for the electric bake element to heat evenly or the gas igniter to glow and light the burner within a short time.
4. Bad oven temperature sensor
When the oven starts heating but runs far too cool, overshoots badly, or stalls during preheat, the sensor becomes a strong suspect.
Quick check: Look for a sensor probe inside the oven cavity that is loose, damaged, or giving obviously erratic temperature behavior.
Step-by-step fix
Step 1: Reset the cycle and confirm the oven is really being told to heat
A surprising number of no-heat complaints are a mode or setup issue, especially after a power blink, self-clean, or someone bumping the controls.
- Cancel anything currently on the display.
- Set the oven to a normal bake cycle at a moderate temperature, not warm, proof, delay start, or timer-only mode.
- Make sure the door is fully shut and not being held open by a pan, rack, or misaligned gasket.
- If this is a double oven, confirm you selected the correct upper or lower cavity.
Next move: If the oven starts heating normally now, the problem was a setting or door-closure issue. If the display accepts the command but the oven stays cold, move on to power and heating-pattern checks.
What to conclude: You have ruled out the easy user-setting problems before chasing parts.
Stop if:
- The control panel is blank or not responding at all.
- You smell gas.
- The door will not close or latch properly after a clean cycle.
Step 2: Check for a power problem before blaming oven parts
Electric ovens especially can look alive with only partial power. That can fool you into thinking a heating part failed when the supply is the real problem.
- Check the breaker panel for a tripped oven or range breaker and reset it once if needed.
- If the breaker trips again, stop there.
- On an electric unit, see whether broil works any better than bake or whether neither one heats.
- On a gas unit, note whether the display and convection fan work even though the burner never lights.
Next move: If resetting the breaker restores normal heat and it holds, monitor the oven through a full preheat and one cooking cycle. If the breaker is fine and the oven still will not heat, the failure is more likely inside the oven cavity or heating circuit.
What to conclude: Stable power with no heat points you away from the house supply and toward the oven's bake hardware, igniter, or sensor.
Step 3: Watch the first few minutes of preheat and separate electric from gas behavior
The way the oven acts during startup tells you more than the display does. This is where the lookalike problems split apart.
- Start a bake cycle and watch safely through the door or from the lower access area if visible without disassembly.
- On an electric oven, look for the oven bake element to begin glowing or at least heating evenly. Check for blisters, cracks, or a section that stays dark.
- On a gas oven, listen for clicking and look for the oven igniter to glow. A healthy igniter usually leads to burner ignition fairly quickly.
- If broil works but bake does not, focus on the bake side rather than the whole oven.
Next move: If you clearly see the bake element heating or the gas burner lighting, the oven is not fully dead and the sensor or control logic becomes more likely than the main heat source. If the electric bake element never heats, or the gas igniter glows without lighting the burner, you have a strong main-part diagnosis.
Step 4: Check the oven temperature sensor if the oven heats weakly or never reaches set temperature
When the heat source does come on but the oven runs far off target, the sensor is a better bet than guessing at bigger parts.
- Turn power off to the oven before touching internal parts.
- Locate the oven temperature sensor probe inside the oven cavity, usually mounted through the rear wall.
- Make sure it is not loose, bent into contact with the wall, or damaged at the mounting point.
- If you can safely access the connector and test resistance with power disconnected, compare the reading at room temperature to the expected value for an oven sensor. If you cannot test it, use the symptom pattern instead of guessing.
Next move: If the sensor is loose and securing it restores normal heating, verify with a full preheat. If the sensor looks intact but the oven still heats badly, the failed bake element or weak igniter remains more likely unless testing proves the sensor bad.
Step 5: Replace the failed heating part that matches what you found, or call for service if the clues do not line up
By now you should have a supported path instead of guess-buying. The common fixes are straightforward; the less common control-side failures are where it makes sense to stop.
- Replace the oven bake element if an electric oven has a visibly damaged element or the bake element never heats while power is present.
- Replace the oven igniter if a gas oven igniter glows but the burner does not light, or lights only after a long delay.
- Replace the oven temperature sensor if testing shows it is out of range or the oven heats but runs clearly off temperature with the heat source working.
- If neither bake nor broil heats, the wiring is damaged, or the diagnosis points toward the oven control, schedule service instead of ordering parts blindly.
A good result: If the oven reaches preheat normally and cycles heat on and off in a steady way, the repair path was correct.
If not: If the new part does not change the symptom, stop and have the oven professionally diagnosed for wiring or control failure.
What to conclude: You have covered the most common homeowner-fixable causes. What is left is usually a wiring issue, relay failure, or a model-specific control problem.
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FAQ
Why does my Bosch oven have power but not heat?
That usually means the display and controls still have power, but the actual heating side does not. On electric ovens, partial power or a failed oven bake element is common. On gas ovens, a weak oven igniter is a top cause.
If broil works, does that mean the bake element is bad?
On an electric oven, broil working while bake does not makes the oven bake element a strong suspect. On a gas oven, it points more toward the bake igniter or bake burner side rather than the whole oven being dead.
Can an oven igniter glow and still be bad?
Yes. That is one of the most common gas-oven failures. The igniter can glow orange but still be too weak to open the gas valve reliably.
How do I know if the oven temperature sensor is the problem?
Move the sensor up the list when the oven does heat but runs far too cool, too hot, or never settles near the set temperature. A completely cold oven with no bake activity is more often a bake element or igniter problem than a sensor problem.
Should I replace the oven control board if the oven will not heat?
Not first. Control failures happen, but they are less common than a bad oven bake element, weak oven igniter, sensor issue, or supply problem. Save the control diagnosis for after the simpler, more likely checks are ruled out.