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Bosch Oven Error Code F43

DIY checks firstReviewed November 2026Checked against manufacturer documentation
What this code means
F43: Oven door latch will not unlock (upper or single oven)

F43 leaves the door locked after the cycle that needed it — usually self-clean. Heat is the first suspect: the lock is supposed to hold until the cavity cools. Only a door that stays locked on a cold oven has an actual latch fault.

Fix level
DIY checks first
Start with the checks on this page. Testing or replacing a part is usually a technician job.
Time to run the checks
About 20–40 minutes
For the 4 checks on this page — not a full repair.
You may need
No special tools
The checks below use basic household items only.
Parts that may be involved
Door latch assembly, Latch motor (+1 more below)
Parts are model-specific; see the note below before ordering.

Common causes

  1. Oven still too hot for the latch to release
  2. Latch motor failed or mechanism seized
  3. Latch switch stuck in the locked position
  4. Door or latch distorted by self-clean heat

What to check, in order

Safety first. Switch the appliance off and unplug it before checking anything inside it. If you are not comfortable with any step, stop and call a technician.
  1. If the code follows self-clean, let the oven cool completely — the latch is designed to stay locked while the cavity is hot, sometimes for an hour or more.
  2. Once fully cool, switch the power off at the breaker for a minute and restore it; the latch often cycles and releases on power-up.
  3. Do not force the door: prising it open bends the latch and door frame and turns a motor fault into a much larger repair.
  4. Still locked when stone cold after a power reset means the latch motor or switch has failed — book a technician, who can release it from inside.

Clear the code and test

  1. Fix what the checks above found first. Clearing the code without fixing the cause only brings it back.
  2. Plug the appliance back in and restore its water supply if it has one.
  3. Run the shortest programme and watch the point where the code appeared before.
  4. If the programme finishes with no code, the fault is cleared. If the code returns, write it down before calling a technician — it speeds up the diagnosis.

When to call a professional

Most cases are solved by the checks above. Book a technician if any of these apply:

  • The code comes back after you have run the checks and a test cycle.
  • You smell burning, see sparks or scorch marks, or the breaker trips.
  • Water is leaking and you cannot stop it at the tap.
  • The fix needs panels opened beyond what your manual describes, or a part tested with a meter, and you are not set up for that.

When you call, give the brand, the code F43, your model number (on a label inside the door or on the back) and the checks you already ran. It shortens the visit.

Parts that may be involved

Door latch assemblyLatch motorLatch switch

Parts are model-specific. Find your model number first — usually on a label inside the door, on the door frame or on the back — and match the part to that number before ordering.

Questions people ask about F43

What does F43 mean on a Bosch oven?

F43 means: Oven door latch will not unlock (upper or single oven). F43 leaves the door locked after the cycle that needed it — usually self-clean. Heat is the first suspect: the lock is supposed to hold until the cavity cools. Only a door that stays locked on a cold oven has an actual latch fault.

Can I fix Bosch F43 myself?

Start yourself: the checks on this page cover the causes you can reach without opening the machine up. If they point to a faulty part, testing or replacing it is usually a technician job.

How do I clear Bosch F43?

Fix the cause first — clearing the code on its own brings it straight back. Then restore power and water, run the shortest programme, and watch the stage where the code appeared. If the programme finishes with no code, it is cleared.

Sources checked

The meaning and checks for this code were checked against the sources above in November 2026. Codes vary by model and region; if your manual lists a different meaning for your exact model, follow the manual.

Other Bosch oven codes

Bosch E000Wrong module combination — control module and user interface are mismatchedBosch E005Communication error between user interface and control moduleBosch E009ROM check error in the user interfaceBosch E010Data memory error in the user interfaceBosch E011One key pressed continuously (key held for 10 seconds or more)Bosch E032Multiple keys pressed continuouslyBosch E101Cavity temperature sensor open circuit (upper or single cavity)Bosch E104Cavity temperature sensor shorted (upper or single cavity)Bosch E106Door latch does not lock (upper or single cavity)Bosch E107Door latch does not unlock (upper or single cavity)Bosch E115Temperature in the unlocked cavity too high (upper or single cavity)Bosch E116Meat probe error — probe connection unstable or shortedBosch E118Cooling fan supervision error — fan speed too low or too highBosch E122Meat probe sensor temperature too high or shortedBosch E123Meat probe sensor temperature too lowBosch E126Door latch error — latch position switch signals lostBosch E302Control module too hot — electronics over temperatureBosch E303Electronics temperature too high or rising too fast (control module)Bosch E309ROM check error in the control moduleBosch E310Data memory error in the control moduleBosch E312Defective control module temperature sensorBosch F111Runaway oven temperature (upper or single oven)Bosch F113Runaway oven temperature at the higher limit (upper or single oven)Bosch F121Stuck key on the touch control panelBosch F125Cancel key circuit problem (upper or single oven)Bosch F141Slave microprocessor not functioningBosch F151EEPROM failure or communication circuit errorBosch F153Control calibration values out of rangeBosch F155Corrupted EEPROMBosch F31Oven temperature sensor failure (upper or single oven)Bosch F32Lower oven temperature sensor failureBosch F33Warming drawer temperature sensor defectiveBosch F41Oven door latch will not lock (upper or single oven)Bosch F42Lower oven door latch will not lockBosch F44Lower oven door latch will not unlockBosch F45Oven door latch switches defective — latch reads locked and unlocked at the same time