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Error code reference

Bosch Range Error Code F111

Oven runaway

Bosch codesBosch range codes

Oven runaway — one or more cycle relays on the power board are stuck in closed position when control is home or idle.

First step from the service manual

Double line breaker tripped-out heating. Check oven sensor connection at relay board, resistance at connector to chassis for open circuit, resistance at connector approx. 1100 ohms at room temp.

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

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What F111 means on a Bosch range

F111 on a Bosch range indicates an oven runaway condition, specifically caused by one or more cycle relays on the power board being stuck in the closed position while the control is in a home or idle state. Cycle relays are responsible for switching power to the oven heating elements on and off under normal control commands. When a relay welds shut or fails closed, the heating element receives continuous power regardless of what the control board is commanding, causing the oven temperature to rise without limit. This is a protective fault the control detects when it recognizes heating activity that should not be occurring.

The power board, sometimes called the relay board, is the component most directly involved. The relay contacts themselves can weld closed due to repeated high-current switching, heat stress, or a voltage spike event. Because the relay is physically stuck, cycling power or resetting the control will not resolve the underlying hardware failure. The control will continue to flag F111 as long as the relay remains welded.

The first diagnostic step involves checking the oven temperature sensor, which is also critical to this fault. The sensor should be checked at its connector to the relay board for an open circuit, and its resistance should measure approximately 1100 ohms at room temperature. A failed or disconnected sensor can contribute to runaway conditions because the control loses its ability to accurately monitor oven temperature. Additionally, the double line breaker should be inspected for a tripped-out heating leg, which can affect how the fault presents during diagnosis.

Source: manufacturer service documentation.

Common causes of F111

  1. 01

    Welded or stuck cycle relay on the power board

    Part replacement

    The most likely cause is a relay on the relay board that has welded shut, keeping the heating circuit closed even when the control is idle. The power board will typically need to be replaced to resolve this.

  2. 02

    Faulty or disconnected oven temperature sensor

    Part replacement

    A disconnected or failed oven sensor can prevent the control from accurately reading oven temperature, contributing to a runaway condition. Check the sensor connector at the relay board and confirm resistance reads approximately 1100 ohms at room temperature.

  3. 03

    Open circuit in oven sensor wiring

    Wiring / connection

    Damaged or corroded wiring between the oven sensor and the relay board connector can cause an open circuit reading, signaling a loss of temperature feedback. Inspect the connector and wiring harness for breaks, burn marks, or corrosion.

  4. 04

    Tripped double line breaker

    Wiring / connection

    A tripped leg on the double pole circuit breaker can affect how heating circuits behave and how the fault presents during diagnosis. Check the breaker at the panel and reset or replace it if one leg has tripped.

  5. 05

    Control board communication failure

    Part replacement

    In some cases, the main control board may fail to properly command the relay board, causing relays to remain in an unintended state. If the relay board checks out and the sensor reads correctly, the control board should be evaluated.

See the test procedure for each cause

Frequently asked questions about F111

What does F111 mean on a Bosch range?
F111 indicates an oven runaway condition, meaning one or more cycle relays on the power board are stuck in the closed position while the oven control is idle or in its home state. This causes the heating element to receive continuous power even when no bake or broil cycle has been commanded. The control detects this unintended heating activity and displays F111 as a protective fault to alert the user.
Is it safe to use my Bosch oven when F111 is showing?
No, the oven should not be used while F111 is active. A stuck relay means the heating element may run without any temperature limit or control, creating a potential fire or burn hazard. The oven should be turned off and the circuit breaker should be opened until the relay board and sensor have been properly diagnosed and repaired.
Will resetting my Bosch range clear the F111 error?
Resetting the control or cycling power will not clear F111 if the underlying cause is a physically welded relay, because the relay remains stuck regardless of what the control commands. The fault will return as soon as the control detects that heating is occurring in an idle state. A proper repair, typically replacement of the power board, is required to resolve the condition.
How do I diagnose and fix the F111 error on a Bosch range?
Start by checking the double line breaker at the electrical panel for a tripped leg. Next, inspect the oven temperature sensor connection at the relay board and measure the sensor's resistance at its connector to the chassis, looking for approximately 1100 ohms at room temperature and confirming there is no open circuit. If the sensor checks out, the cycle relay on the power board is the most likely cause and the relay board will need to be replaced. This repair typically requires a qualified appliance technician.
How much does it cost to repair an F111 error on a Bosch range?
Repair costs depend on which component has failed. If only the oven temperature sensor needs replacement, costs are generally lower, typically in the range of $100 to $250 including labor. If the power relay board requires replacement, costs can range from $200 to $450 or more depending on the specific model and local labor rates. Obtaining a diagnosis before ordering parts is recommended to avoid unnecessary expenses.

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