Bosch Oven F112 and F114 Error Codes Explained

If your Bosch oven is flashing an F112 or F114 error, don’t worry, you’re not dealing with anything overly complex. We’ll break down what each code means, what typically causes them, and how you can fix the issue yourself without needing to call in a repair tech.

If you find out that you need any replacement parts for your appliance while you’re troubleshooting, you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

The information in this article may not apply to your specific appliance model. We recommend consulting your manufacturer’s documentation or contact us with any questions.

What is an F112 error code?

The F112 error code indicates that the lower oven cavity in a Bosch double wall oven has surpassed its safe operating temperature limit and gone into thermal runaway.

Each oven cavity contains a temperature sensor connected back to the main control board. If the lower oven sensor reports a temperature reading above 950°F, the F112 fault will be triggered and the oven turned off.

Some of the potential causes of F112 overheating faults include:

• Malfunctioning temperature sensor providing false high readings
• Defective door gasket allowing heat to escape
• Latch not sealing door properly in the locked position
• Failure of a heating element to turn off when commanded
• Short circuit in oven wiring
• Failure of the electronic control board

Left unchecked, an F112 overheating failure can pose serious fire and safety hazards. 950°F exceeds the auto-ignition point for grease, paper, and food residue in the oven – which could combust and spread flames rapidly.

The F112 fault disables all oven functions until it is properly addressed. Your ability to use the lower oven will be halted until the overtemperature condition is corrected.

What causes an F114 error code?

Similarly, an F114 error indicates the upper oven cavity has exceeded the maximum allowed temperature ceiling of 950°F.

This points to an overheating or runaway scenario in the upper oven, which has its independent heating systems and temperature sensors apart from the lower cavity.

As with the lower oven F112 failure, potential F114 causes include:

• Faulty upper oven temperature sensor
• Deteriorated door gasket or latch seal
• Shorted/stuck relay on the heating element
• Loss of temperature regulation by the control board
• Electrical short circuit

Both F112 and F114 faults are considered serious safety issues, as uncontrolled 950°F+ temperatures can lead to the combustion of food debris and grease inside the oven.

The overtemperature condition must be corrected before the affected oven cavity can be safely used again.

Safety precautions

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind: 

• Always power off and unplug your appliance or switch off the circuit breaker before attempting any maintenance or replacement work. This keeps you safe by preventing any risk of injury from electric shock.
• Wear insulated work gloves to protect your hands from sharp metal parts, pinching hazards and debris.
• Take your time and don’t rush while working to prevent accidents and personal injuries.
• Work in a well-lit area so you can clearly see and access the interior parts.
• Clear your workspace of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with bare wet hands. Make sure the work area is completely dry.
• Check your user manual to see if there are specific installation or safety instructions for your part or appliance. 
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause injury.
• Wear safety glasses when working with chemicals, dust or cleaning large debris to prevent injury. 
• If the appliance has recently been used, give it plenty of time for any heating parts to cool down before working on it. 
• Take pictures or make a note of wiring terminals or other connections before disconnecting to prevent any problems with reassembly.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.

Troubleshooting steps

Now let’s walk through the proper troubleshooting steps to diagnose and resolve F112/F114 oven overheating faults:

Step 1: Allow the oven to completely cool

1. Immediately turn off the power to the oven at the breaker if an F112 or F114 is displayed.
2. Keep the oven turned off and allow sufficient time for the interior to cool down fully before restarting. Given the indicated temperature, complete cooling can take several hours.
3. Do not restart the oven until it has had plenty of time to cool below the 950°F threshold.

Step 2: Inspection of temperature sensors

Since sensor defects can falsely report overheating readings, inspect both upper and lower oven sensors:

1. Carefully disconnect sensor wiring and use a highly accurate digital multimeter to check resistance. Compared to spec – around 1000-1100 ohms at room temperature. Look for any questionable fluctuations.
2. Examine connector pins for corrosion or damage. Clean with electrical contact cleaner or replace the sensor. Bad connections can cause resistance.
3. Confirm proper routing of sensor wires through the oven chassis. Make sure the insulation is intact with no shorts to metal.
4. Remove sensors from the oven cavity and visually inspect elements for damage. Look for cracked glass or aging element wire.
5. Verified sensors are securely mounted in the oven cavity according to manufacturer specifications, allowing proper heat transfer.

Step 3: Testing of door seals and latches

If sensors verify accurately, meticulously test door components:

1. Use a flashlight to visually inspect door gaskets for any gaps, tears, debonding, or missing areas that could compromise the seal. Perform checks with doors both open and closed.
2. Test latch operation and alignment at multiple points along the door perimeter, marking any areas with inadequate closure pressure. Adjust or replace worn latch components as needed.
3. Check for warping or misalignment issues with hinges that could disrupt proper door closure. Adjust or replace damaged hinges.
4. Use a slip of paper to test seal integrity around the perimeter of the closed door. There should be firm resistance when sliding paper between the gasket and cavity.

Take your time validating the door’s sealing performance. Even small gaps can allow dangerous heat leakage.

Step 4: Heating element testing

Test all oven heating elements:

1. Initiate bake mode at low temperature and use an infrared thermometer gun to check each element, both on and off. Scan the entirety of the elements for any unusually hot spots that could indicate a stuck relay.
2. Remove the rear access panel and check the element wiring for signs of overheating, shorts, or damage. Test relays for proper open/closed operation and resistance.
3. Verify elements are properly seated in their ceramic holders and wire connections are intact. Check terminations for signs of arcing or overheating.
4. Remove and visually inspect elements for cracks in ceramic insulation or damage to internal wiring. Replace any defective units.

When testing heating systems – failure to properly turn off when commanded is a common cause of thermal runaway issues indicated by F112 and F114 faults. Thoroughly examining each oven component using troubleshooting methods will help isolate the true cause of those overheating issues and get your oven safely back up to temperature.

Step 5: Replacement and testing of control board

If all oven components and sensors verify electrical sound, the issue likely points to the failure of the electronic control board itself.

Control boards regulate all key oven functions like temperature sensing, heating element control, sensor input processing, and fault monitoring. An internal component failure can lead to loss of proper oven thermal regulation – despite all sensors and heating components testing well.

Here are tips on replacing the oven control board:

• Obtain the exact replacement control board kit indicated for your specific Bosch oven model number. Do not substitute – the boards are calibrated and configured for each model’s parameters. You can purchase a compatible OEM board by visiting our site here.
• Disconnect the power and carefully disassemble the oven according to manufacturer service instructions to access the control board for the replacement.
• Before installation, visually inspect the new control board for any loose components or obvious signs of damage from shipping or handling.
• Carefully install the new board, referring to the wiring diagram, and take care not to bend, pinch, or damage any wire connections. Make sure connectors are fully seated.
• Reassemble the oven, again ensuring no wires are pinched or components dislodged in the process.
• Restore power and select Bake mode. Carefully monitor board function and temperature regulation through several full heat-up and cool-down cycles to confirm proper operation.
• Additionally, run a full self-clean cycle to verify proper door latch function and overheat regulation under maximum oven load.
• If any issues arise, carefully re-check all sensors, wiring, connections, and components to isolate the failure.

Additional information

Thank you for reading! We hope this guide helped you get your oven working again.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos. 

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog and more.

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