- Appliance
- cooktops
- Diagnostic
- $80
- Labor warranty
- 90 days
- Parts warranty
- 365 days
Thermador cooktop: dead induction zone, clicking burner
Independent Thermador induction and gas cooktop repair in Fleming Island and Clay County FL: one dead zone, a burner that keeps clicking, coil boards and fans.
Symptoms we see
- Induction zone reports no pan with a pan sitting on it
- Cooling fan running loudly, or running long after the surface is off
- One zone dead while the rest of the surface works normally
- Gas burner clicking continuously after the flame has lit
- Low simmer setting cycling hard instead of holding
- Touch surface reading phantom presses or ignoring input
- Surface shutting itself down mid-cook and restarting
- Cooktop not heating on any zone after a power interruption
Thermador builds two very different cooking surfaces, and they fail for completely different reasons. Induction fails electronically. Gas fails mechanically. Getting the diagnosis right starts with knowing which conversation you are in.
Induction: it is a power supply problem until proven otherwise
An induction zone is an inverter driving a coil. Behind the glass sits a coil board, a set of power devices, thermistors watching the coil and the glass, and a fan whose entire job is to keep those power devices inside their temperature limits. Almost every induction complaint traces back to one of those four things.
“No pan detected” with a pan sitting on the zone is the most common call. It is occasionally a genuine cookware problem — an aluminium or copper pan, or a base that has warped away from the glass — and a magnet on the pan base settles that in five seconds. When the pan is right, the fault is on the board side: a detection circuit that has drifted, or a coil that has lost continuity.
A surface that runs for a while and then shuts a zone down is thermal. Either the cooling fan has slowed or its intake is blocked, or the thermistor is reading correctly and the power stage really is overheating. Cabinet installations matter here: an induction cooktop needs a clear intake path underneath it, and a drawer packed to the ceiling directly below the unit will produce intermittent shutdowns that look electronic and are not.
In Clay County there is a third cause we see more than most: storm damage. Roughly 68 thunderstorm days a year go through kitchens on this side of Doctors Lake, and a near-strike transient will take out a coil board while leaving the interface lit. Two zones failing in the same afternoon is a supply-side story, not a coincidence, and we measure the supply before we condemn a board.
Induction needs the circuit it was specified for
A full-width induction cooktop draws serious current and wants its own high-amperage circuit. Older kitchens on the island were frequently wired for a gas cooktop and a downdraft, which is nothing like the same load. When we are called to an induction surface that browns out under a heavy load, or trips at boost, the first measurement is at the terminal block, not inside the appliance. If the answer is that the circuit is undersized, we will say so and hand it to an electrician rather than sell you an appliance repair that will not fix it.
Gas: burners, ignition and the low end
Thermador’s gas burners use a star-shaped port pattern that spreads flame across a wider footprint than a conventional ring, and the low-end simmer capability is one of the main reasons people buy them. Both of those characteristics depend on clean ports and correct gas pressure.
Continuous clicking after a burner has lit is nearly always a wet or fouled igniter, or a burner cap that has been reseated a millimetre off its locating pins. It is a five-minute fix that people live with for months. A simmer that cycles hard instead of holding a steady low flame is usually a valve or an orifice matched to the wrong fuel — a unit converted from natural gas to propane, or converted back, without the conversion being finished properly.
Yellow, lazy flame tips point at air shutter setting or supply pressure. We measure manifold pressure rather than adjusting by eye, because “it looks better now” is not a diagnosis.
Glass, and when it is over
A cracked or chipped induction glass top ends the conversation. There is no repair for the glass surface, and continuing to run a cracked induction top puts liquid onto live electronics. We will tell you that on the phone rather than charge for a visit to say it in person.
Every visit is a flat-rate diagnostic, credited toward the repair, with a written estimate before any part is ordered. Parts are genuine OEM.
What does cooktops and rangetops repair cost here?
The visit is $80. Beyond that, the honest answer is a band and not a number, because the same symptom has two or three candidate causes and they do not cost the same. The bands that fit this page are below. Parts and labour together, the work on this sheet lands between $200 and $1,050. The exact number is set down in writing once the fault has been read, and nothing is ordered until you have seen it.
| Repair | Parts and labour |
|---|---|
| Diagnostic visit, credited to the repair | $80 |
| Igniter, spark module or surface element | $200–$530 |
| Control board or touch panel | $440–$1,050 |
| Convection fan or motor | $270–$730 |
| Door hinge, glass or seal | $200–$660 |
What do owners ask before booking cooktops and rangetops work?
- One induction zone is dead and the rest of the surface works. What is that?
- Almost always the coil board that drives that zone, not the whole surface. Zones are driven in pairs or singly depending on the model, so a storm hit or a heat-soaked board takes out what it is wired to and leaves the rest alone. Changing the one board rather than the surface is the difference between $440–$1,050 and a new appliance.
- Why does the cooling fan under the cooktop run so long after cooking?
- It is doing its job. Induction electronics sit in a shallow cabinet and shed heat for a long time after the surface is off. It becomes a fault when the intake is choked with dust, the cabinet cutout was never opened to specification, or the thermistor reads high. The fan and motor band is $270–$730.
- The burner keeps clicking after the flame has lit — is that dangerous?
- It is not a gas leak, but it should not be left. A continuous spark after ignition usually means the flame is not being sensed: a cracked igniter, a burner cap sitting proud of its seat, or spillage bridging the electrode. Igniters and spark modules sit at $200–$530, and a reseated cap costs nothing but the visit.
- Is it worth repairing a cooktop, or is it time for a new surface?
- Repairing, in almost every case. One dead zone is its own coil board at $440–$1,050, a clicking burner is an igniter at $200–$530, and a comparable new rangetop or range is $5,500–$14,500 for the appliance alone. Replacing a whole surface to cure one failed zone is the expensive way to change one part.
What owners said about cooktops and rangetops
4.6 out of 5, across 73 customer reviews. Each one below is a single visit, in the words of the person who paid for it.
A whole row of touch controls had stopped answering. It was the ribbon connector rather than the panel, which he said was the cheaper half of the two. Working again, and he was clear about what else tends to go at that age.
Philippa N.
One zone was running at maybe half its power while everything else behaved normally. He read the coil board rather than guessing, replaced it, and boiled the same pan on all four zones so I could see they matched.
Horatio W.
One burner was burning yellow and sooting the base of the pan. The cap had gone back a fraction out of its seat after a clean, which I had done myself. He seated it, checked the rest, and charged me for nothing I did not need.
Augustin P.