Bosch Dishwasher E:18 when fill water barely arrives

What E:18 means

Where E:17 means too much pressure, E:18 means too little. The dishwasher called for water, only a trickle arrived, and after waiting it ended the program. Bosch blames weak incoming pressure first, then looks further along: the resistance of the valve coil, the wiring out of the control unit, and the voltage that really reaches the valve while it should be filling.

Common causes of E:18

Small screen in the hose coupling clogged
Supply stop under the sink only partly open or seized
Fill valve coil dead, or no voltage arriving during the fill

✓ One safe check you can try

1. Turn the supply stop under the sink fully open, not just cracked. 2. Shut it again, unplug the dishwasher and unscrew the fill hose from the stop. 3. Rinse the small mesh screen inside the coupling under a tap. 4. Reconnect snugly, reopen the stop and run a short program. A blocked screen is the usual reason a healthy supply turns into a trickle.

! Why to stop there

A coil that tests open needs the valve replaced, and a screen that is only dirty needs nothing but a rinse.
Voltage checks at the valve terminals are live measurements and not a casual home job.
Overtightening the hose coupling to stop a drip can crack the plastic fitting.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Dishwasher codes

E:30Bosch Dishwasher E:30, voltage too high and the machine shut down E:31Water in the zeolite container - Bosch Dishwasher E:31 FBosch Dishwasher F on an older display (water filling) 2HBosch Dishwasher 2H: Long Cycle Warning on Older Displays 1Bosch Dishwasher Service Test Result 1: Aqua Sensor 2Bosch Dishwasher Service Test Result 2: Heating Group 4Bosch Dishwasher Service Test Result 4: Water Filling 8Bosch Dishwasher Service Test Result 8: Temperature Sensor

E:18E:18 questions

Why would the shut-off valve be half closed?

Under-sink valves get bumped when cabinets are cleaned, and old ones can seize partway. Opening it fully is the first check, and it costs nothing.

How long should the inlet filter screen be cleaned?

Rinse it whenever the hose is off, and check it if fill times seem to grow. Scale or sediment can build gradually and you may not notice until the machine stops.

If the screen is clean, what is next?

We test the valve coil and the voltage reaching it during a fill, then decide between the valve and the wiring. The written price covers whichever repair the readings support.