Error Code: E91 Difficulty: Hard
Problem: Software or board error.
How to Fix E91 Error (Step-by-Step)
- Disconnect the washer from power by unplugging it from the wall outlet to ensure safety.
- Turn off the hot and cold water supply valves connected to the back of the machine.
- Remove the top panel of the washer by unscrewing the screws holding it in place, typically located at the back or sides.
- Locate the main control board, which is usually housed in a plastic casing at the front of the washer, behind the control panel.
- Carefully disconnect all wire harnesses and connectors from the old control board, taking a photo beforehand can help with reassembly.
- Remove the screws or release the clips securing the old board and gently lift it out of its housing.
- Install the new control board (part 11031054), secure it in place, reconnect all wire harnesses exactly as they were, and reassemble the washer by reversing the previous steps.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
What to Check Next on This Bosch Washer
Bosch Washer Error E91: 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.
Recommended Parts to Check
No exact official OEM part number is listed here because the correct Bosch washer part can vary by complete model number. These are targeted part-category searches, not universal fit claims.
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Bosch washer electronic control boardCommon replacement category: Main control boardFit note: Exact OEM part number varies by full Bosch washer model number. Confirm compatibility before buying.Confidence: Medium
This category can be relevant for control and communication faults after wiring and connector checks. -
Bosch washer user interface control panelCommon replacement category: User interface / display boardFit note: Exact OEM part number varies by full Bosch washer model number. Confirm compatibility before buying.Confidence: Medium
This category can be relevant for display, button, selector, or cycle-control faults. -
Bosch washer drain pump assemblyCommon replacement category: Drain pumpFit note: Exact OEM part number varies by full Bosch washer model number. Confirm compatibility before buying.Confidence: Medium
This category can be relevant for drain, no-spin, and water-removal symptoms after filter and hose checks.
Before ordering: match the part to the complete Bosch washer 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.
More options (for a better recommendation)
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When It’s Better to Replace Than Repair
Sometimes replacing an appliance makes more financial sense than putting more money into repairs.
Here are a few signs it may be time to shop for a new one:
For repair parts, verify exact fit with the full washer model number before buying; these links are general replacement-appliance shopping options.
- ✓Appliance over 8-10 years old
- ✓Repair cost over 50% of replacement
- ✓Multiple recent breakdowns
- ✓Major component failure
Recommended Replacement Options
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Expert: Mike Sullivan
EPA Section 608 Certified Technician with 18+ years experience.
Read Editorial Standards →Browse all Bosch error codes: Bosch Error Codes
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