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Error code reference

Bosch Range Error Code F122

Selection mechanism for touch keys faulty

Bosch codesBosch range codes

Selection mechanism for touch keys faulty — contamination on back side of glass between display control and glass.

First step from the service manual

Clean glass with alcohol to remove contamination. Confirm that oven vent is not discharging behind front manifold.

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

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What F122 means on a Bosch range

The F122 error code on a Bosch range indicates a fault in the selection mechanism for the touch keys, specifically caused by contamination on the back side of the glass panel between the display control board and the glass surface. The touch key system relies on precise capacitive or conductive signals passing cleanly through the glass interface. When grease, moisture, or cooking residue accumulates on the back side of the glass, it interferes with the signal transmission between the control electronics and the touch surface, causing the range to register the selection mechanism as faulty.

The most common source of this contamination is the oven vent discharge. Bosch ranges route oven exhaust through a vent, and if that vent is positioned such that it discharges behind the front manifold or control panel area, it deposits aerosolized grease and moisture directly onto the interior glass surface over time. This is a gradual process, meaning the error may appear only after extended use or after cooking sessions that produce significant steam or grease vapor.

Diagnosing this code begins with cleaning the back surface of the glass panel thoroughly using isopropyl alcohol to dissolve and remove any residue. After cleaning, the oven vent routing should be inspected to confirm it is not directing exhaust toward the back of the control panel glass. If the vent is improperly routed or a seal has failed, the contamination will return and the F122 code will reappear even after cleaning.

Source: manufacturer service documentation.

Common causes of F122

  1. 01

    Grease or residue on back of control glass

    Wiring / connection

    Cooking grease and moisture can migrate to the interior surface of the control panel glass and disrupt the touch key signals. This is the most frequent cause of F122 and is confirmed by visually inspecting or wiping the back glass surface with isopropyl alcohol.

  2. 02

    Oven vent discharging behind front manifold

    Wiring / connection

    If the oven vent is routed incorrectly or a seal has deteriorated, hot, greasy exhaust can blow directly behind the control panel glass, depositing contaminants repeatedly. Inspect the vent path to confirm exhaust is not directed toward the control area.

  3. 03

    Moisture intrusion from spills or steam

    Wiring / connection

    Liquid spills on the cooktop surface or heavy steam from stovetop cooking can seep behind the glass panel over time. Check for visible moisture or residue streaking on the interior glass surface.

  4. 04

    Failed or deteriorated vent seal

    Part replacement

    A worn seal around the oven vent outlet can allow exhaust gases to escape into areas near the control panel rather than directing them away from the unit. Replacing the damaged seal will prevent recurring contamination.

  5. 05

    Faulty display control board

    Part replacement

    If cleaning the glass fully resolves the contamination but the F122 code persists, the display control board itself may have suffered damage from prolonged exposure to grease or moisture and may need replacement.

See the test procedure for each cause

Frequently asked questions about F122

What does F122 mean on a Bosch range?
F122 indicates a fault in the touch key selection mechanism caused by contamination on the back side of the glass between the display control and the glass panel. Grease, moisture, or cooking residue interferes with the signals the touch keys rely on to function. The error is commonly triggered by oven vent exhaust discharging behind the front manifold and depositing contaminants on the interior glass surface. Cleaning the back of the glass with isopropyl alcohol is the recommended first step.
How do I fix the F122 error on my Bosch range?
Start by cleaning the back surface of the control panel glass thoroughly with isopropyl alcohol to remove any grease or moisture residue. After cleaning, check that the oven vent is not routing exhaust behind the front manifold, as this will cause the contamination to return. If the code persists after cleaning and the vent is confirmed to be properly routed, the display control board may need to be inspected or replaced by a qualified technician.
Is the F122 error on a Bosch range a safety hazard?
The F122 code itself is not a direct safety hazard, as it relates to contamination affecting the touch key interface rather than a gas leak or heating element failure. However, if the error prevents the controls from responding correctly, it could limit your ability to operate the range safely. It is best to address the code promptly rather than continuing to use the appliance with a malfunctioning control panel.
Will resetting my Bosch range clear the F122 error?
A power reset may temporarily clear the F122 display, but the error will return if the underlying contamination on the back of the control panel glass is not removed. The code is triggered by a physical condition at the glass interface, so a reset alone does not resolve the root cause. Cleaning the glass and inspecting the vent routing are necessary steps to prevent the code from reappearing.
How much does it cost to repair a Bosch range showing F122?
If the issue is only contamination on the glass surface, the repair may cost nothing beyond isopropyl alcohol and your time. If the oven vent seal is damaged and needs replacement, parts and labor costs typically range from around $75 to $200 depending on the specific component and your location. In cases where the display control board has been damaged by prolonged exposure to grease or moisture, repair costs can range from $200 to $500 or more including parts and professional labor.

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