Bosch Washer Error F40

How to Fix F40 Error (Step-by-Step) Turn the washing machine off by turning the dial to the ‘Off’ position. Unplug the washer from the power outlet and confirm the error stays cleared during a full test cycle. Wait for at least 5 minutes to allow the internal electronics to reset. Plug the washer back into the power outlet and confirm the error stays cleared during a full test cycle. Turn the dial to a wash cycle and press ‘Start’. If the error persists, check for any visible loose connections on the control board (if comfortable doing so after unplugging the machine). Turn the appliance off, wait about 2 minutes, then turn it back on.

What to Check Next on This Bosch Washer Bosch Washer Error F40: Use the code or symbol as the starting clue, then confirm the actual symptom before ordering parts. Unplug the washer before touching wiring, the lock, the pump area, or the control panel. Check the door lock, drain filter, inlet supply, and visible harness connections before replacing controls. If the code returns during the same part of the cycle, match the repair path to that stage: fill, wash, drain, spin, lock, or control response. If the issue returns after these checks, match replacement parts to the complete Bosch model number from the appliance tag. The same code can point to different components depending on the exact model and when the failure appears. Likely Parts to Check No exact official OEM part number is listed here because the correct Bosch Washer part can vary by full model number. These are targeted part-category searches, not universal fit claims. Washer electronic control board Common replacement category: Main control board Fit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying. Confidence: MediumThis category can be relevant for control and communication faults after wiring checks. Inspect wiring, connectors, airflow, water path, or filters first as applicable. Search Amazon for Washer electronic control board Washer user interface control panel Common replacement category: User interface / display board Fit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying. Confidence: MediumThis category can be relevant for display, button, selector, or cycle-control faults. Inspect wiring, connectors, airflow, water path, or filters first as applicable. Search Amazon for Washer user interface control panel Washer drain pump assembly Common replacement category: Drain pump Fit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying. Confidence: MediumThis category can be relevant for drain, no-spin, and water-removal symptoms after filter checks. Inspect wiring, connectors, airflow, water path, or filters first as applicable. Search Amazon for Washer drain pump assembly Before ordering: match the part to the complete model number on the appliance tag. Still Not Working? If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.