Controls light up, but nothing heats
The cooktop has power and responds to touch controls, but every pan stays cold.
Start here: Start with cookware, control lock, and a full power reset before assuming an internal failure.
Cooktop Troubleshooting
Thermador Induction Cooktop Not Heating
Direct answer: If an induction cooktop lights up but does not heat, the most common causes are the wrong pan, a pan that is too small or off-center, a locked control, or a power issue that leaves the controls alive but the heating side disabled.
Most likely: Start by proving the pan is induction-ready and matched to the burner size, then reset the cooktop and check whether one zone fails or all zones fail.
Induction cooktops can look half-working when they are not actually making heat. The display may respond, a fan may run, and the surface may seem normal, but the pan never gets hot. Separate the simple pan-and-setting problems from a true cooktop failure first. Reality check: a lot of no-heat calls on induction units turn out to be cookware, not a bad part. Common wrong move: testing with a lightweight aluminum pan and assuming the burner is dead.
Don’t start with: Do not start by ordering a cooktop switch or cooktop burner. Induction units are picky about pan detection, and that fools a lot of people into buying parts they do not need.
If every zone is deadCheck house power, recent breaker trips, and whether the cooktop will fully reset.
If only one zone is deadFocus on that burner area, pan size match, and a likely failed cooktop burner or cooktop switch branch.
Last reviewed: 2026-04-17
What the no-heat problem looks like
One burner will not heat
Other cooking zones work normally, but one spot will not detect the pan or will not make heat.
Start here: Use a known-good induction pan on that zone and compare it to a working zone right away.
Burner clicks, hums, or flashes, then stops
The zone tries to start, may show a blinking indicator, then drops out without heating.
Start here: That usually points to pan detection, pan size mismatch, or poor pan contact before it points to a bad part.
Cooktop stopped heating after a trip or outage
The problem started after a breaker trip, power flicker, or recent electrical work.
Start here: Check for a partial power issue and do a full reset before digging deeper.
Most likely causes
1. Wrong cookware or poor pan contact
Induction only heats magnetic cookware, and some pans either do not trigger the zone or only work on certain burner sizes.
Quick check: Try a flat-bottom magnetic pan that works on another induction burner, and center it on the problem zone.
2. Control lock, paused setting, or low-power mode confusion
The cooktop can appear on while the heating function is blocked by a lock or setting issue.
Quick check: Clear any lock indicator, cancel all zones, then power the cooktop off and back on.
3. Partial power loss or control glitch
Induction cooktops may light up with a control-side supply problem while the heating side will not run correctly.
Quick check: Shut power off at the breaker for a few minutes, restore power, and retest all zones.
4. Failed cooktop burner or cooktop switch on one zone
If one zone consistently fails with known-good cookware while the others work, the fault is usually local to that burner circuit or its control input.
Quick check: Use the same pan on a working zone, then move it back to the dead zone and compare behavior.
Step-by-step fix
Step 1: Make sure the pan is the problem or not
Induction cooktops will not heat the wrong pan, and that is still the fastest thing to rule out.
- Use a pan with a flat bottom and a magnetic base. If a magnet barely sticks or does not stick, do not use that pan for testing.
- Pick a pan size that matches the burner area. A very small pan on a large zone often will not trigger properly.
- Center the pan on the marked cooking zone and make sure the bottom is clean and dry.
- If possible, use a pan that already works on another induction burner in the house.
- Test the same pan on a working zone, then move it to the problem zone.
Next move: If the cooktop heats with the known-good pan, the cooktop is fine and the original cookware was the issue. If the same good pan works elsewhere but not on this zone, keep going.
What to conclude: You have separated a cookware problem from a cooktop problem without taking anything apart.
Stop if:
- The cooktop glass is cracked or chipped near the burner.
- You smell burning plastic or see sparking under the glass.
- The pan rocks badly because the glass surface is damaged.
Step 2: Clear lockouts and reset the controls
A locked or glitched control panel can leave the unit looking alive while the heating command never actually takes.
- Cancel all active settings on the cooktop.
- Check for a control lock or child lock indicator and clear it if present.
- Turn the cooktop off at its main control.
- Shut the cooktop power off at the breaker for 3 to 5 minutes, then restore power.
- Retest one zone with the same known-good pan.
Next move: If heating returns after the reset, the issue was likely a temporary control fault or lock state. If the controls respond normally but the burner still will not heat, move on to power and zone comparison.
What to conclude: You have ruled out the easy electronic hiccups that commonly mimic a failed part.
Step 3: Figure out whether all zones are affected or just one
One dead zone points you toward a local burner or switch problem. All dead zones point more toward supply or control trouble.
- Test every cooking zone with the same known-good induction pan where size allows.
- Note whether any zone heats normally, even briefly.
- If none of the zones heat, check whether the exhaust fan sound, indicators, or touch controls still seem normal.
- If only one zone fails, compare how that zone responds to pan placement versus a working zone.
Next move: If you find at least one working zone, you can narrow the repair to the failed burner area instead of the whole cooktop. If no zones heat, the problem is likely not a single burner and usually needs electrical diagnosis beyond simple homeowner checks.
Step 4: Inspect the problem zone from the top side only
Visible damage around one burner often confirms whether you are dealing with a local cooktop failure.
- With power off, inspect the glass over the failed zone for impact damage, discoloration, or a heat shadow that looks different from the other zones.
- Check that the touch control for that zone responds consistently and is not sticky, cracked, or dead in one spot.
- Clean the glass with a soft damp cloth and mild soap if there is greasy buildup where the pan sits or where the touch control is pressed, then dry it fully.
- Retest the failed zone with the same pan after cleaning and drying.
Next move: If the zone starts working after cleaning and drying, poor touch response or pan contact was likely the issue. If one zone still will not heat while others do, a failed cooktop burner or cooktop switch becomes the most likely repair path.
Step 5: Take the next action based on what failed
At this point the pattern is usually clear enough to avoid random part buying.
- If one zone alone will not heat, and a known-good pan works on other zones, plan on a cooktop burner or that zone's cooktop switch after confirming fitment for your exact cooktop.
- If the zone selector or power level control for one burner does not respond reliably, lean toward the cooktop switch first.
- If all zones stay dead even after a reset, stop at diagnosis and schedule service. That points to a broader internal electrical problem, not a simple top-side repair.
- If the cooktop trips the breaker, smells burnt, or shows damage under the glass, leave power off and call for service.
A good result: If the replaced zone component restores normal heating, verify that the burner detects the pan quickly and holds heat at several settings.
If not: If a confirmed one-zone part replacement does not fix it, the fault is deeper in the cooktop electronics and is usually not a good DIY next step.
What to conclude: You now have a clean repair decision: local zone part for a one-burner failure, or professional electrical diagnosis for an all-zone or unsafe failure.
Replacement Parts
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FAQ
Why does my induction cooktop turn on but not heat?
Most often, the pan is not induction-ready, the pan is too small for the zone, the pan is off-center, or the controls are locked or glitched. If one zone alone fails with known-good cookware, that points more toward a local cooktop part problem.
How do I know if my pan will work on an induction cooktop?
Use a magnet. If it sticks firmly to the bottom, the pan is usually induction-compatible. A flat bottom matters too. Some pans are technically magnetic but still perform poorly if the base is thin or uneven.
Why does one induction burner work and another does not?
That usually means the cooktop has a local problem at the failed zone, not a whole-unit power problem. First rule out pan size mismatch. If the same good pan works on another zone but not that one, the cooktop burner or cooktop switch is the likely repair path.
Can a breaker issue make the cooktop light up but not heat?
Yes. Induction cooktops can act partly alive when the control side has power but the heating side is not getting what it needs. That is why a full breaker reset is worth doing early.
Should I keep using the cooktop if it hums or flashes but does not heat?
A brief hum can be normal on induction, but repeated dropouts, flashing, burnt smell, or breaker trips are not. Stop using it if the behavior is getting worse, if the glass is damaged, or if the breaker will not hold.
Is this usually a DIY repair?
Simple checks are DIY-friendly: cookware, lock settings, cleaning, and a breaker reset. A confirmed one-zone part replacement may be reasonable for an experienced homeowner. All-zone failures, repeated breaker trips, burnt smells, or anything requiring live electrical diagnosis are better left to a service tech.