Bosch Oven Error Code F33
On ranges and wall ovens with a warming drawer, F33 reports that the drawer's own temperature sensor is not reading correctly, so the drawer will not heat. The oven cavities are unaffected, but the sensor is internal and drawer wiring flexes every time the drawer moves, which is the usual failure point.
Common causes
- Warming drawer temperature sensor failed
- Drawer sensor wiring damaged by the drawer sliding mechanism
- Loose sensor connector at the control board
- Control board fault
What to check, in order
- Cancel the drawer function, switch the power off at the breaker for a minute and retry the drawer once.
- Remove the warming drawer and look for anything stored inside or behind it that is pressing on the sensor or its wires.
- Check the visible wiring at the back of the drawer cavity for chafing or a plug that has worked loose.
- The sensor itself sits inside the drawer cavity and testing or replacing it is internal work — if the code returns, book a technician and quote F33.
Clear the code and test
- Fix what the checks above found first. Clearing the code without fixing the cause only brings it back.
- Plug the appliance back in and restore its water supply if it has one.
- Run the shortest programme and watch the point where the code appeared before.
- 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
This code usually points to a faulty part, wiring or the control board on a Bosch oven. Run the checks above to rule out the simple causes, then book a technician — and book one straight away 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 F33, your model number (on a label inside the door or on the back) and the checks you already ran. It shortens the visit.
Repair or replace?
This fault is in professional territory: the fix usually means a major part or board-level work, and the labour adds up. If your machine is already well into its service life, get the repair quote first, then compare it with the price of a current equivalent model before you decide. Paying a large share of a new machine's price to repair an old one is rarely the better deal; replacing a machine over one cheap fault is wasteful too.
Parts that may be involved
Warming drawer temperature sensorWire harness
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 F33
What does F33 mean on a Bosch oven?
F33 means: Warming drawer temperature sensor defective. On ranges and wall ovens with a warming drawer, F33 reports that the drawer's own temperature sensor is not reading correctly, so the drawer will not heat. The oven cavities are unaffected, but the sensor is internal and drawer wiring flexes every time the drawer moves, which is the usual failure point.
Can I fix Bosch F33 myself?
Only the preliminary checks. Code F33 usually means a part, wiring or the control board has failed, which is a technician job. Run the checks to rule out simple causes before you book.
How do I clear Bosch F33?
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
- Bosch Home (US) owner support: dishwasher error codes
- Coolblue advice: Bosch and Siemens washing machine errors
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.