Error Code: E28 Difficulty: Hard
Problem: AquaSensor (turbidity sensor) fault.
How to Fix E28 Error (Step-by-Step)
- Disconnect the dishwasher from power and water supplies for safety.
- Carefully pull the dishwasher out from under the counter to access its components.
- Locate the AquaSensor, which is usually found in the sump area at the bottom of the dishwasher tub.
- Disconnect the wiring harness attached to the old sensor and confirm the error stays cleared during a full test cycle.
- Remove the old sensor by twisting it counter-clockwise and pulling it out.
- Install the new AquaSensor by pushing it in and twisting it clockwise to lock it into place.
- Reconnect the wiring harness, slide the dishwasher back into place, and restore power and water.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
Next Steps and Parts
- 00424099
- 00611317
Recommended Parts to Check
No exact official OEM part number is listed here because the correct Bosch dishwasher part can vary by complete model number. These are targeted part-category searches, not universal fit claims.
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Bosch dishwasher water inlet valveCommon replacement category: Water inlet valveFit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying.Confidence: Medium
This category can be relevant for fill and water-supply faults after the tap, hose, and inlet screen are checked. -
Bosch dishwasher drain pumpCommon replacement category: Drain pumpFit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying.Confidence: Medium
This category can be relevant for drain and standing-water symptoms after the filter, sump, and hose are checked. -
Bosch dishwasher circulation pumpCommon replacement category: Circulation pump / wash motorFit note: Exact OEM part number varies by full Bosch dishwasher model number. Confirm compatibility before buying.Confidence: Medium
This category can be relevant for wash, spray-arm, and circulation symptoms after filters and spray arms are checked.
Before ordering: match the part to the complete Bosch dishwasher 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
Dishwasher repairs can add up quickly when the pump, control, heater, or leak-related parts fail.
Confirm cabinet width, water line, drain routing, electrical connection, and panel style before ordering.
For repair parts, verify exact fit with the full dishwasher model number before buying; these links are general replacement-appliance shopping options.
- [OK]Drain pump or circulation pump failure
- [OK]Leaking tub, door, or float-switch issues
- [OK]Heater or control failures on an older unit
- [OK]Repeated poor washing or drying performance
Recommended Dishwasher Replacement Options
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