The short answer: Thermador ovens report faults through F-prefixed codes that point to a category of problem, a control fault, a sensor reading out of range, or a relay or heating issue, rather than naming an exact part. On the cooktop side, Star-Burner ignition trouble is usually a dirty or misaligned burner, and induction pan-detection issues start with checking that the cookware is magnetic. Refrigeration columns are diagnosed one column at a time like any built-in.
The Thermador Lineup
Thermador covers a lot of ground. Its gas ranges and cooktops use the patented Star-Burner, a star-shaped burner that spreads flame more evenly than a round burner, paired with the ExtraLow setting that cycles the flame to hold a true, gentle simmer for melting and delicate sauces. On the electric side, Freedom Induction cooktops use a continuous induction surface that senses cookware anywhere on the zone rather than on fixed rings. For cold storage, Freedom refrigeration columns are full-height, single-purpose units, refrigerator, freezer, or wine, installed together to build a custom configuration. And across the kitchen sit Thermador wall ovens and range ovens with electronic controls.
Because these systems are so different, diagnosis differs too. A Star-Burner problem is mechanical and about the flame path; a Freedom Induction issue is about cookware and electronics; a column is a refrigeration problem; and an oven fault often announces itself with a code. We service all of them.
Common Repairs We See
Star-Burner Ignition and Extralow
A Star-Burner that clicks without lighting or lights unevenly usually has a dirty or misaligned burner cap, food in the igniter area, or a worn igniter or spark module. The ExtraLow simmer depends on the burner and control cycling the flame correctly, so a burner that will not hold a low simmer can point to the same ignition path or the control that manages the cycling.
Freedom Induction Faults
Induction cooktops heat only ferromagnetic cookware, so a pan that will not heat often just is not induction-compatible, a magnet test settles it. When compatible cookware is not detected, or a zone loses power, the cause is usually the cooktop's sensing or power electronics. Because Freedom Induction reads cookware across the whole surface, detection oddities there frequently point to the control board.
Freedom Refrigeration Columns
Columns fail like other built-in refrigerators: a warm cabinet from a defrost or evaporator fan fault, frost from a defrost issue, or condensation from a worn door seal. Each column is its own sealed system, so a fault stays contained to that unit. Our refrigerator repair service covers Thermador columns.
Ovens and F-Codes
Thermador ovens display F-codes when the control detects a problem in the keypad, the temperature sensor, or the heating relays. The code narrows the search, and a technician confirms the exact cause before replacing a part. Wall ovens are covered under our wall oven repair service.
When a Thermador oven throws an F-code, note the exact code and what the oven was doing, then power the unit off at the breaker for a minute and back on. A one-time code from a power blip may clear. If it returns, resist swapping parts based on the code alone. The same code can have different causes across model years, so it points a trained technician toward the right subsystem rather than naming the failed part outright.
Thermador Fault-Code Reference
Thermador ovens publish F-prefixed codes. The table below describes the general fault category each type of code signals, in plain terms, because the precise wording and the exact fault vary by model and should be confirmed against your unit rather than assumed. Cooktop and column symptoms that do not produce codes are handled by the symptoms above.
| Code Type | General Meaning | What a Technician Checks |
|---|---|---|
| F1 type | Control or keypad fault detected | Control board, keypad, and wiring; a stuck key or failed board |
| F2 type | Over-temperature or runaway heating condition | Temperature sensor, relay, and heating element for a stuck-on state |
| F3 type | Temperature sensor reading out of range | Oven temperature sensor and its wiring for an open or short |
| F7 type | Relay or control circuit stuck or shorted | Relays on the control board and the door lock circuit |
| No code, oven off temperature | Calibration drift or sensor fault without a triggered code | Recalibration; sensor replacement if the gap is large |
Treat these as families of faults, not exact strings. Your model's manual and the diagnostics a technician runs on the appliance are what confirm the specific meaning.
Maintenance Across the Thermador Kitchen
On Star-Burner cooktops, cool the burners, then lift and wash the caps and bases, dry them fully, and clear the igniter areas so the star flame lights cleanly and ExtraLow holds a steady simmer. On Freedom Induction, keep the glass clean and wipe spills promptly, since burnt-on residue can interfere with the surface and its sensors, and use only cookware a magnet grips firmly. Protect the glass from being scraped by heavy pans dragged across it.
For Freedom refrigeration columns, clean the condenser area on schedule and keep door gaskets clean and pliable so each column holds its temperature without overworking. On ovens, keep the door seal clean and run self-clean only when needed. Catching a slow calibration drift early with an oven thermometer beats discovering it mid-roast. These small routines reduce the odds of an F-code or a warm column across your Thermador appliances.
When to Call for Service
Some things are worth ruling out first: a magnet test on an induction pan, a clean-and-reseat on a Star-Burner, or a breaker cycle on an oven showing a one-time code. If an F-code returns, if a zone will not power or detect proper cookware, if a burner will not hold ExtraLow, or if a refrigeration column drifts warm, the appliance needs a proper diagnosis.
Control boards, induction power electronics, sensors, gas components, and sealed-system work all call for a trained technician,. Refrigerant work requires confirmation of applicable qualification requirements. Our brand-focused Parts needs and availability are confirmed after model-specific diagnosis.Written warranty terms for eligible completed repairs. Diagnostic and travel fees, if applicable, are confirmed before the appointment and before repair approval. Learn more on the Thermador repair page or our about page.