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Error code · Cooktop

Thermador Cooktop F4 Error Code: All Zones Off

Every cooking zone goes dark at once and F4 is shown. Thermador records this on both of its cooktop platforms as overheated electronics. Unlike F2, which cuts a single zone, F4 takes the whole surface out…

Moderate · have it inspected
Code
F4
Appliance
Cooktop
Brand
Thermador
Warranty
30-day workmanship

What F4 means

Every cooking zone goes dark at once and F4 is shown. Thermador records this on both of its cooktop platforms as overheated electronics. Unlike F2, which cuts a single zone, F4 takes the whole surface out of service so the electronics can cool down before cooking is allowed again. The cooktop is simply waiting for the temperature to drop.

Usual causes of F4

  • Several zones working hard for a long time, warming the shared electronics
  • Air movement beneath the cooktop restricted by stored items or tight cabinetry
  • A cooling system problem when the code appears without any heavy cooking
✓ A safe check worth trying

1. Switch the zones off and wait until the cooktop has cooled completely. 2. Look under the counter for anything stored too close to the underside and move it if you can do so safely. 3. Touch a control element to restart once the code is gone.

! Why you should stop here
  • Because the whole cooktop shuts down rather than one zone, a repeat points to a broader cooling issue worth a technician's attention.
  • Anything past clearing an obvious obstruction means opening the unit near live wiring.
Taking off a panel yourself does not by default void a manufacturer warranty, yet it can lead to accidental damage, and some manufacturers attach their own service terms. Read your warranty paperwork, or ask us, before you decide.
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F4F4 questions
Is the cooktop ruined when F4 appears?

No. It is the overheat protection for the entire unit, and in most cases cooking can resume once everything has cooled. Trouble begins only when it keeps coming back.

Should I search under the cooktop for a blockage?

If you already know something is stored right beneath it, moving it is sensible. Beyond that, inspecting the unit is better left to a technician.

How is F4 different from F2?

F2 shuts down one zone on the electric platform. F4 shuts down all of them, which is why a repeat F4 suggests a wider cooling concern.

Request service

Is F4 still showing?

Our technician checks it in your home and hands you a written price before touching anything.