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Error code reference

Bosch Range Error Code F120

Any key (except CANCEL) pressed longer than 60 seconds, possibly caused by steam or soap build-up on touch…

Bosch codesBosch range codes

Any key (except CANCEL) pressed longer than 60 seconds, possibly caused by steam or soap build-up on touch zones.

First step from the service manual

Customer education to direct excessive steam from pots away from touch areas. Clean excessive grease and grime build-up on touch surface areas. Use alcohol to clean contamination on back side of glass.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F120 means on a Bosch range

The F120 error code on a Bosch range indicates that a key on the touch control panel has been detected as continuously pressed for longer than 60 seconds. The capacitive touch system interprets this sustained signal as a stuck or jammed input, which triggers the fault to prevent unintended operation. This is a protective function built into the control logic to detect abnormal input conditions that could interfere with safe range operation.

The most common source of this fault is not a mechanical failure but a contamination issue on the touch surface or the underside of the control glass. Steam rising from boiling pots can condense on the touch zones and alter the capacitive field enough to mimic a sustained key press. Similarly, grease, soap residue, or cleaning product buildup on the glass surface can create false continuous signals across one or more touch zones.

The back side of the control glass is also a potential source of the problem. Contamination on the interior face of the glass, which is not visible from the outside, can interfere with the capacitive sensors mounted behind it. Cleaning the back surface with isopropyl alcohol is a key diagnostic step because it addresses contamination that routine surface wiping would miss entirely. If cleaning resolves the fault, no parts replacement is necessary.

Source: manufacturer service documentation.

Common causes of F120

  1. 01

    Steam condensation on touch zones

    Wiring / connection

    Steam from boiling pots rising toward the control panel can condense on the capacitive touch surface and create false sustained inputs. Redirecting pot lids and steam away from the control area and allowing the surface to dry typically clears this condition.

  2. 02

    Grease or soap buildup on touch surface

    Wiring / connection

    Accumulated cooking grease, soap, or cleaning product residue on the touch glass can alter the capacitive field and simulate a continuously pressed key. Cleaning the surface thoroughly with an appropriate cleaner will often resolve the fault.

  3. 03

    Contamination on the back side of the control glass

    Wiring / connection

    The interior face of the touch glass can accumulate residue that interferes directly with the capacitive sensors behind it. This requires cleaning with isopropyl alcohol on the back surface of the glass, which is not reachable without accessing the panel.

  4. 04

    Physically stuck or damaged touch key

    Part replacement

    In some cases, a touch zone may be physically compromised due to impact damage or a defect in the control panel overlay. If cleaning does not resolve the fault, the touch control panel assembly may need inspection and replacement.

  5. 05

    Faulty touch control board

    Part replacement

    If contamination has been ruled out and the fault persists, the underlying touch control board may have a sensor or circuit failure causing it to report a continuous key press. Board replacement would be required in this scenario.

See the test procedure for each cause

Frequently asked questions about F120

What does F120 mean on a Bosch range?
F120 means the control panel has detected a touch key being held continuously for more than 60 seconds, which it treats as an error condition. This is most often caused by steam, grease, or soap residue on the touch surface rather than an actual hardware failure. The range triggers this code as a protective measure to prevent unintended operation from a false sustained input.
Can I fix the F120 error myself without calling a technician?
In many cases, yes. Start by wiping down the touch control surface to remove any grease, soap, or moisture. If you can access the back side of the control glass, clean it with isopropyl alcohol to remove hidden contamination. Also make sure to redirect steam from cooking pots away from the control panel area, as condensation is a frequent trigger for this fault.
Will resetting the range clear the F120 error?
A reset may temporarily clear the F120 code, but if the underlying contamination is still present, the fault will return once the control panel is active again. Pressing CANCEL or cycling the power may clear the display, but a thorough cleaning of the touch surface is needed to prevent recurrence. Address the root cause first for a lasting fix.
Is it safe to keep using my Bosch range while F120 is showing?
It is best to clear the fault before resuming normal use, as the error indicates the control panel is receiving an unintended sustained input. Continuing to operate the range with an active F120 code could result in unexpected behavior from the controls. The CANCEL key is specifically excluded from triggering this fault, so you can use it to attempt clearing the error.
How much does it cost to repair a Bosch range showing F120?
If cleaning resolves the issue, there is no parts cost and you may avoid a service call entirely. If a touch control panel or control board replacement is needed, parts and labor costs typically range from $150 to $400 or more depending on the specific model and local labor rates. Getting a diagnostic assessment from a qualified technician before authorizing parts replacement is advisable.

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