Error Code: E18 Difficulty: Moderate
Problem: Drainage Error; blockage in the filter or drainage system.
How to Fix E18 Error (Step-by-Step)
- Begin by cleaning the drain pump filter, which is located behind the service flap at the bottom front of the washer. Place a towel and a shallow dish below it to catch water before unscrewing the filter cap.
- Remove any lint, coins, or other debris from the filter and the pump cavity.
- Inspect the main drain hose at the back of the machine for any kinks or sharp bends that could restrict water flow.
- Disconnect the drain hose from the household drain pipe and check for any clogs at the connection point or within the hose itself.
- If the filter and hose are clear, the blockage may be in the internal sump hose connecting the tub to the pump. This requires removing the front or back panel for access.
- If all hoses are clear, the drain pump itself may have failed and will need to be replaced.
- Turn the appliance off, wait about 2 minutes, then turn it back on.
What to Check Next on This Bosch Washer
Bosch Washer Error E18: 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.
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Washer electronic control boardCommon replacement category: Main control boardFit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying.Confidence: Medium
This category can be relevant for control and communication faults after wiring checks. Inspect wiring, connectors, airflow, water path, or filters first as applicable. -
Washer user interface control panelCommon replacement category: User interface / display boardFit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying.Confidence: Medium
This category can be relevant for display, button, selector, or cycle-control faults. Inspect wiring, connectors, airflow, water path, or filters first as applicable. -
Washer drain pump assemblyCommon replacement category: Drain pumpFit note: Exact OEM part number varies by model. Confirm compatibility using the full model number before buying.Confidence: Medium
This 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.
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.
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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