Thermador Freedom induction not working or dead zone

Why is my Thermador induction not working?

A Thermador Freedom induction surface that won’t heat is, more often than people expect, a cookware problem rather than a broken cooktop. Induction makes heat by inducing an eddy current directly in the iron of the pan, so the glass first checks for ferrous metal underneath. A non-magnetic stainless, aluminum, copper or glass pot has nothing for the coil to grip, so the zone reads as empty and stays stone cold — often with a beep or a pan symbol. The same happens with a pan whose base is warped off the glass or smaller than the roughly 4.7 inches the coil needs to couple. Before anything is condemned, the pan is the first thing to rule out, and our Thermador repair hub starts every cooktop call the same way.

When a proven induction pan still won’t heat, the fault moves into the cooktop itself. Freedom induction lays a grid of coils under one sheet of glass and drives them through inverter power modules; a single failing module can leave specific zones dead while the rest cook normally. A surface thermistor watches glass temperature and will pause a zone on an overheat shutoff. And the user-interface board, the control lock, and the dedicated 240V supply all have to be healthy before any coil fires at all.

Dead zone, no power, or drops out mid-cook — which is it?

Match your exact symptom to the likely cause below. The pattern — one zone versus the whole surface, cold from the start versus quitting mid-cook — usually narrows the fault before a technician arrives.

Symptom	Likely cause	What we do
One zone cold, others heat, with a pan symbol	Non-magnetic, warped or undersized cookware	Magnet-test the pan, confirm with a proven induction pot
One specific zone fails a known-good pan	Inverter power module for those coils failing	Test the module against spec, fit a genuine OEM board
Whole surface dark, won’t power on	Tripped 240V leg or engaged control lock	Reset the dedicated breaker, clear the lock, then test the UI board
Zone heats then quits mid-cook	Overheat shutoff from the surface thermistor or a stalled cooling fan	Read the thermistor, check the inverter cooling airflow
Beeps and powers down with a pan present	Pan-detection sensing or undersized pan	Recentre an induction-ready pan, then test the detection circuit

How do I tell the cookware from the cooktop?

Start with a fridge magnet. Press it to the base of your pan: if it doesn’t grip firmly, induction physically cannot drive that pot and no repair will change that. Next, put a pan you know is induction-ready flat and fully centred over the zone — an undersized or off-centre base reads as no pan. If that proven pan heats on every zone, the cooktop is healthy and the original cookware was the problem. If the good pan heats most zones but dies on one specific spot, the cooktop side needs diagnosis, because a single coil group fed by a failing inverter module is the classic dead-zone signature. A mid-cook drop-out is its own tell: note whether the glass was very hot or a pan had boiled dry, since that points to an overheat shutoff rather than a dead board.

What does a Thermador induction diagnostic cost?

We never quote an induction board over the phone, because the most common “dead cooktop” turns out to be a pan. On site, the technician confirms power and the control lock, rules out cookware, then meters the surface thermistors and the inverter power modules under load to find what’s actually failing. A power module, thermistor, cooling fan or user-interface board is a non-sealed repair in the $200–$700 band, with the flat $89 diagnostic waived once you approve any repair — see the full ranges on our Thermador repair cost page. If the glass is showing a fault code instead of a pan symbol, our Thermador error codes reference maps it to the component behind it. Because Tri-Valley kitchens in San Ramon, Danville and Dublin run hot in summer and pack the underside vents with dust, a stalled inverter cooling fan that triggers mid-cook overheat shutoffs is something we see often — the same heat-and-airflow logic our professional range repair work follows. We carry genuine OEM induction boards and sensors matched to the rating plate, so the surface is fixed in one trip and tested under real cooking load before we leave.