Bosch Dishwasher E18 Error: Water Inlet Flowmeter Fix
Updated: February 2026
The Bosch E18 error code indicates your dishwasher is experiencing water inlet or flowmeter problems. The system detects that water flow doesn't match expected parameters during the fill cycle.
Understanding E18
Modern Bosch dishwashers use a flowmeter to measure incoming water volume and rate. This sensor ensures the correct amount of water enters the tub. The E18 error appears when flow is too slow, too fast, or completely blocked, or if the flowmeter itself has failed.
Comprehensive Repair Steps
- Step 1: Turn off the water supply valve under the sink. Disconnect power to the dishwasher at the breaker.
- Step 2: Pull the dishwasher out slightly for access. Disconnect the water supply line from the inlet valve.
- Step 3: Remove and inspect the inlet valve screen. Clean thoroughly to remove sediment, rust, or debris that restricts flow.
- Step 4: Turn on the water supply briefly into a bucket to verify good house water pressure (20-120 psi required).
- Step 5: Locate the flowmeter sensor (usually integrated into the inlet valve assembly). Check the wiring connection for corrosion or looseness.
- Step 6: Test the flowmeter electrically if possible, or replace the entire inlet valve assembly if the flowmeter is integrated and can't be tested separately.
- Step 7: Check for kinked or compressed fill hose that would restrict water flow even with good pressure.
If all mechanical checks pass but E18 persists, the control board may be misreading flowmeter signals. After replacement of faulty components, reconnect everything, turn on water supply, and check for leaks. Run a test cycle to confirm E18 is resolved and water fills properly.
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