Error Code: AQUA SENSOR FAULT Difficulty: Hard
Problem: Indicates a fault with the aqua sensor (turbidity sensor), which monitors the soil level of the wash water. This can lead to unusually long or short cycles.
How to Fix AQUA SENSOR FAULT Error (Step-by-Step)
- Disconnect the dishwasher from power by turning off the circuit breaker and shut off the water supply line, typically found under the sink.
- Open the dishwasher door and remove the bottom dish rack to access the inside of the tub.
- Unscrew and remove the filter assembly located at the bottom of the dishwasher tub by twisting it counter-clockwise. Also, remove the lower spray arm by pulling it straight up.
- The aqua sensor (turbidity sensor) is located in the sump area, which is now visible. Carefully disconnect the wire harness attached to the sensor.
- Release the locking tabs holding the old sensor in place and remove it from the sump housing. Be prepared for a small amount of residual water to spill out.
- Install the new sensor by pressing it firmly into the sump housing until the locking tabs click into place. Reconnect the wire harness securely.
- Reinstall the lower spray arm and the filter assembly, then place the bottom rack back inside. Restore power and water to the dishwasher and run a test cycle to ensure the error is cleared.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
What to Check Next on This Bosch Dishwasher
Bosch Dishwasher Error AQUA SENSOR FAULT: Use the code, light, or symbol as the starting clue, then confirm what the dishwasher actually does before ordering parts.
- 1. Turn power off before opening panels, reaching into the sump, touching wiring, or checking the pump, heater, valve, sensor, latch, or control area.
- 2. Confirm whether the display is a normal cycle/status symbol or a recurring fault that interrupts filling, washing, draining, drying, locking, or control response.
- 3. Start with the wash path: filter, sump debris, spray-arm movement, circulation-pump sound, wiring, and control output.
- 4. Clean the filter and sump, check spray-arm movement, verify water supply, inspect the drain hose and sink connection, and correct any visible blockage before replacing parts.
- 5. Run a short test cycle and watch where it fails; the exact stage matters more than the displayed word or symbol by itself.
- 6. Replace a part only after the same symptom repeats and the model-specific checks point to that part category. Match any replacement to the complete Bosch model number on the door tag.
If the issue returns after these checks, match replacement parts to the complete Bosch dishwasher model number from the door tag. The same display clue 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 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.
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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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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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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