Thermador Induction Cooktop Not Heating: Check the Pan, Zone, and Power

Use only checks that match the exact appliance or system and its official guide.

1. Check 1

   Stop first if the glass is cracked, liquid has entered the controls, there is smoke, a burning odor, visible arcing or sparking, or the breaker trips again. If it is safe to do so, turn the appliance off at its controls and isolate the accessible circuit; do not touch damaged wiring or continue testing.

   Expected result: The surface or controls are damaged, unusually hot, wet, smoking, sparking, or repeatedly losing power.

   Next step: Leave the cooktop out of use and arrange qualified appliance or electrical service. Escalate an active smoke, fire, or gas hazard through local emergency procedures.

   Why this matters

   Why: This is a safety or electrical fault, not a normal pan-detection problem.

2. Check 2

   Use one clean, flat-bottomed pan on one zone. Place a magnet against the pan base, then center the pan over the selected zone and within the zone's usable size. Remove trivets, foil, warped pans, and anything between the pan and glass.

   Expected result: A magnet does not stick, the pan is very small for the zone, the pan is visibly warped, or the heating level flashes and the pan is not recognized.

   Next step: Try a known induction-compatible, flat pan whose base fits the zone; if the same suitable pan is still not detected, continue to the control and code checks.

   Why this matters

   Why: The zone may be healthy but cannot couple energy to that cookware or cannot detect its position.

3. Check 3

   Turn the cooktop on, select the exact zone under the pan, choose a moderate heat level, and wipe the touch controls completely dry. Check for a control or child lock indicator and use the normal model-specific unlock gesture from the owner's manual.

   Expected result: The panel responds and the zone heats after it is selected and unlocked, or the controls remain unresponsive / the lock indicator remains on.

   Next step: If unlocking and drying restores heat, monitor the panel. If it stays unresponsive or the lock cannot be cleared using the manual, stop and provide the model and display behavior to service.

   Why this matters

   Why: A wrong zone, locked controls, or moisture on the panel can prevent a heat command even when the cookware is suitable.

4. Check 4

   Test one pan on one zone with other zones off. If the model has joined/flexible zones, verify whether the pan is on the active portion; move nearby pans farther apart. Temporarily disable a boost or high-power feature and retry at a moderate setting.

   Expected result: One zone heats alone but a combination of zones, a joined zone, or a boost request does not, or cookware is shown as one item / multiple items unexpectedly.

   Next step: Use the model's documented zone layout and normal power settings. If a single correctly placed pan still will not heat on one zone, compare it with another zone and continue to the code and supply branches.

   Why this matters

   Why: Zone assignment, cookware position, or the cooktop's power-sharing/temperature protection may be limiting the requested heat; this does not by itself identify a failed coil.

5. Check 5

   Record the exact display before clearing it. For F1/F6 or F2/F4/E7015/E8207/E8208, let the electronics cool and retry only after the message disappears. For F5, remove hot cookware from near the control panel. For F8 with H/h, touch the control as directed to reset the automatic time limitation; for dE or U400, follow the dedicated branch below.

   Expected result: The code clears after cooling or the prescribed control action, or it returns immediately / is not listed in the Thermador guidance.

   Next step: Do not bypass the protection or repeatedly cycle a hot appliance. Save the code, model/serial information, affected zone, and whether the fan continues, then contact qualified service if it returns.

   Why this matters

   Why: A temporary thermal or time-limit condition may have interrupted heating; a recurring or unlisted code points to a fault requiring model-specific diagnosis.

6. Check 6

   If the whole cooktop is dark or every zone is unavailable, check only the accessible plug/switch and whether the dedicated breaker or fuse has operated. Do not open the appliance or measure energized conductors.

   Expected result: The accessible supply is off, the breaker/fuse has operated, or the supply appears normal but the cooktop remains dead; alternatively, only one zone fails while the rest work.

   Next step: If a breaker operates again, leave it off and call a qualified electrician or appliance technician. If the external supply is stable but heating remains absent, arrange model-specific service rather than attempting an internal electrical test.

   Why this matters

   Why: A supply interruption can explain a completely inactive cooktop, while one dead zone after normal external power checks suggests a zone control, sensor, or power-module issue.