Bosch Oven Error Codes & Fault Finder
Find Bosch oven error codes, understand what the fault messages mean, and discover the checks you can make before looking for replacement parts.
Bosch Oven Error Codes Explained
Bosch oven error codes are displayed when the appliance detects a condition that needs attention. Depending on the model, the message may appear as an ER or F code shown on the display, sometimes alongside a beep or flashing symbol. These codes help identify the area of the oven that requires investigation, but the exact meaning can vary between models.
Common Bosch oven error codes relate to the temperature sensor, the mains power connection, or the door lock and latch mechanism. Some faults may clear after switching the oven off and back on, while others point to a component that needs testing or replacement.
Before ordering a spare part, always check the complete model number of your oven. The same oven range can contain several models with different electronics, so the meaning of a code can differ slightly between them. This guide is intended to help you understand the displayed message and decide what to check next.
Find Your Oven Error Code
Bosch Oven Error Codes
Below you’ll find common Bosch oven error codes and practical information about what they can indicate. Because Bosch uses different electronics across its oven range, always confirm the code against the exact model before replacing a component.
ER1Temperature Sensor Failure▼
ER1 — Temperature Sensor Failure
ER1 can indicate a problem with the oven’s temperature sensor circuit. The control board uses this sensor to monitor the cavity temperature, so a fault here can prevent the oven from heating correctly or cause it to stop mid-programme.
What to check
- Switch the oven off at the wall, wait a few minutes, then switch back on.
- Check whether the code returns as soon as a programme is selected.
- Inspect the sensor wiring at the back of the cavity if you’re comfortable doing so safely.
- Avoid running further cooking programmes until the fault is investigated.
ER2Faulty Mains Connection▼
ER2 — Faulty Mains Connection
ER2 can point to an issue with the oven’s mains power connection or supply frequency, rather than a fault within the cooking circuit itself.
What to check
- Check the oven is plugged in correctly and the connection is secure.
- Check the relevant fuse or circuit breaker hasn’t tripped.
- Isolate the oven from the electrical supply before inspecting any wiring.
- If the property has recently had electrical work done, mention this when arranging a repair.
ER4Temperature Sensor Failure▼
ER4 — Temperature Sensor Failure
Like ER1, ER4 relates to a temperature-sensing fault, but on some models it’s associated with a second sensor circuit, such as the grill or a secondary cavity sensor.
What to check
- Note exactly which function was in use when the code appeared (bake, grill, fan).
- Restart the oven and try a different cooking function to see if the code is function-specific.
- Check the appliance model number against Bosch documentation for the exact sensor layout.
ER6Door Lock Faulty▼
ER6 — Door Lock Faulty
ER6 can indicate a problem with the automatic door lock, most commonly seen on ovens with a pyrolytic (self-clean) function. The oven may fail to lock the door before a high-temperature cleaning cycle, or fail to unlock afterwards.
What to check
- Make sure the door is fully closed before starting a cleaning cycle.
- Do not force the door if it appears locked — allow the oven to cool fully first.
- Restart the oven and check whether the code reappears on a normal cooking cycle.
ER7Door Release Mechanism Faulty▼
ER7 — Door Release Mechanism Faulty
ER7 can indicate that the mechanism responsible for releasing the locked door isn’t operating as expected, which is closely related to the ER6 door-lock fault family.
What to check
- Allow the oven to cool completely before attempting to open the door.
- Do not force the door — this can damage the lock mechanism further.
- If the door remains locked after cooling, arrange professional assessment.
F32Temperature Sensor Failure▼
F32 — Temperature Sensor Failure
F32 is another temperature-sensor related code seen on some Bosch oven ranges. It suggests the control board is receiving an implausible or out-of-range signal from the sensor.
What to check
- Switch the oven off, wait a short while, then switch back on to see if the code clears.
- Check the sensor is seated correctly if it’s a plug-in probe type.
- Avoid repeated cooking attempts if the fault returns immediately.
F41Faulty Latch Motor or Wiring▼
F41 — Faulty Latch Motor or Its Wiring
F41 points to the motor that drives the door latch mechanism, or the wiring connected to it. This is common on ovens with an automatic pyrolytic door lock.
What to check
- Listen for the latch motor operating when a self-clean cycle is selected.
- Check the door is closing fully and squarely against the seal.
- Isolate the appliance electrically before inspecting any wiring connections.
F42Faulty or Jammed Lower Door / Latch Switches▼
F42 — Faulty or Jammed Lower Oven Door or Latch Switches
F42 can indicate that the lower door or the switches monitoring the latch position have become jammed, misaligned or faulty, preventing the control board from correctly detecting the door state.
What to check
- Check the door opens and closes freely with no obstruction.
- Look for anything trapped around the door seal or hinge area.
- Avoid slamming the door, as this can affect the latch switches over time.
F43Faulty Latch Motor or Wiring▼
F43 — Faulty Latch Motor or Its Wiring
F43 sits within the same latch-motor fault family as F41 and F44, and can indicate the motor isn’t reaching its expected position within the required time.
What to check
- Restart the oven and check whether the code appears only during a self-clean cycle.
- Check nothing is obstructing the door or latch mechanism.
- Arrange further testing if the code returns consistently.
F44Faulty Latch Motor or Wiring▼
F44 — Faulty Latch Motor or Its Wiring
F44 is closely related to F41 and F43, and typically points to the same door-latch motor and wiring circuit failing to complete its cycle correctly.
What to check
- Switch the oven off and back on to see whether the fault clears.
- Check the door closes fully and the latch engages without resistance.
- If the code returns repeatedly, further electrical testing will likely be needed.
F45Defective or Jammed Upper Door / Latch Switches▼
F45 — Defective or Jammed Upper Oven Door or Latch Switches
F45 is the upper-door counterpart to F42, indicating a problem with the door or latch-position switches on ovens with a second cavity or grill compartment.
What to check
- Check the upper door closes fully and aligns correctly with the seal.
- Look for any obstruction around the hinge or latch area.
- Avoid repeated forceful closing of the door, which can affect the switches.
Other Bosch Oven Error Codes
Bosch ovens can display additional codes and warning conditions depending on the model and control system. If your code isn’t listed above, don’t assume that the nearest-looking code has the same meaning. Search using the exact code together with your full oven model number, or get in touch with our team.
Important Safety Information
Ovens contain mains electrical components and can reach very high temperatures.
Always disconnect the appliance from the electrical supply before carrying out any inspection beyond the checks listed above. If the oven is producing unusual smells, tripping the electrical supply, or the door lock will not release, stop using it and arrange assessment by a suitably qualified appliance engineer.
Need a Bosch Oven Spare Part?
Once you’ve identified the fault and confirmed your appliance model number, you can search for the correct oven spare part.