Bosch Dishwasher Error Code E18 — Water Supply Error
What this means
The E18 error means the dishwasher's water flow sensor detected insufficient water entering the unit. This is usually caused by a closed supply valve, kinked supply hose, or clogged inlet filter.
Step-by-step fix
3 stepsCheck the supply valve
Open the cabinet under the sink and ensure the dishwasher supply valve is fully open.
The valve may have been accidentally bumped partially closed.
Inspect the supply hose
Check the hose running from the supply valve to the dishwasher for kinks.
The hose is usually accessible through the kick plate opening.
Clean the inlet filter
Turn off water, disconnect the supply hose at the dishwasher end, and clean the small mesh filter inside the inlet.
Hard water areas need more frequent filter cleaning.
When to call a professional
If supply is fine but the dishwasher won't fill, the inlet valve may need replacement.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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