Bosch Washer E18 Error: Clear the Drain Filter First

The drum is full of gray water, the door will not release, and the display says E18. The washer is telling you that water is not leaving the drum. Of all the codes on this machine, this is among the few where a homeowner can do something useful before calling anyone.

Why the filter is the first suspect

Coins, buttons, hair ties, and wads of lint travel down the drain path and settle in a small filter near the pump. When it clogs, the pump cannot push water out and the cycle halts. Cleaning it takes about ten minutes.

How to empty and clean it

1. Switch the washer off and unplug it.
2. Open the small hinged panel at the lower front.
3. Lay towels and a shallow pan under the round filter cap, because water will come out.
4. Turn the cap slowly counterclockwise and let the water run into the pan, pausing to empty it as needed.
5. Pull the filter out, remove whatever is lodged in it, and rinse it clean.
6. Thread it back in until it is fully tight, then close the panel.

Run a short rinse or spin to confirm the water leaves. A filter that is not seated all the way will drip on the next load, so check the cap once more.

When cleaning does not help

If the drum still holds water after the filter is clear, the drain pump has probably stopped working or the hose is blocked further along. Those jobs need the machine opened, which is where a technician comes in.

Check the pockets of jeans and kids’ clothes next time, since small items are the most frequent cause of this particular clog and are easy to catch early.

See how a washer repair visit works, then book a technician if E18 returns.