Error Code: E3100 Difficulty: Hard
Problem: Water leak detected in the base.
How to Fix E3100 Error (Step-by-Step)
- Disconnect the dishwasher from power and water supplies. Turn off the circuit breaker and shut off the water valve under the sink.
- Carefully pull the dishwasher out from under the counter to access the base and internal components.
- Remove the lower access panel and toe kick by unscrewing the retaining screws. This will expose the base of the dishwasher.
- Use a flashlight to inspect the base pan for any visible signs of water. Use a sponge or towel to completely dry any water found in the base. The safety switch that triggers this error is very sensitive.
- Inspect all hoses, the sump, the heat pump (part 00755078), and the drain pump (part 00642239) for any visible cracks, loose connections, or signs of leaking. Tighten any loose clamps and replace any damaged components.
- Once all visible leaks are addressed and the base is dry, reconnect the power and water supply. Run a short test cycle while monitoring the base for any new water accumulation before reinstalling the dishwasher.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
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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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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