What Is the Bosch E18 Error Code? How to Fix a Washing Machine Drainage Issue?

2026-10-31

What Does the Bosch E18 Error Code Mean?

Although Bosch washing machines are known for their durability and advanced technology, they can occasionally present users with various error codes. One of the most common among them is the E18 error code. If you see “E18” on the display, it means your machine cannot drain water. Even after completing the wash cycle, it cannot expel the dirty water, so it stops before the spin cycle.

Common Causes of the E18 Error

There are several primary reasons why a washing machine may fail to drain water. They include:

• A clogged drain filter (the most common cause).
• A kinked, crushed, or blocked drain hose.
• A faulty drain pump or a foreign object lodged inside.
• Blockages in the sewer or drainage pipe.

How to Fix a Bosch E18 Error? Step‑by‑Step Guide

There’s no need to panic when you encounter an E18 error. In most cases, you can resolve the issue yourself with simple checks, without calling an authorized service.

1. Check and Clean the Drain Filter

Open the small cover located at the front‑right lower corner of the machine. This cover protects the drain filter. Before opening it, place a towel or a container on the floor to catch any water that will spill out as soon as the cover is removed. Unscrew the filter counter‑clockwise and take it out. Remove any foreign objects such as loose coins, buttons, hairpins, or socks that have accumulated inside. Rinse the filter under running water and firmly reinstall it.

2. Inspect the Drain Hose

Examine the drain hose that exits the back of the machine and connects to the sewer. Look for any kinks, folds, or heavy objects pressing on it. Sometimes blockages occur at the point where the hose enters the drain. You can detach the hose and pour water through it with a bucket to test for clogs.

3. Check the Drain Pump Impellers

At the bottom of the cavity where you removed the filter, you’ll see a pump impeller that resembles a small propeller. Use your finger or a pencil to see if it spins freely. If the impeller does not turn, a piece of debris may be lodged inside. Remove the obstruction carefully.

4. Inspect the Drain Connection

If the hose is connected directly to a wall drain pipe, that pipe is likely to be clogged. A blockage in the pipe under the sink or within the wall can prevent the machine from expelling water, causing the E18 error to persist. In such cases, you may need a plumber’s assistance.

When Should You Seek Professional Help?

If you have performed all the steps above and the machine still shows the E18 error, the problem may be more technical. The drain pump motor could be burnt out, or there could be a fault on the electronic control board. At this point, contacting a qualified service technician is the safest way to avoid further damage.

At Errora, we recommend regular maintenance to extend the life of your appliances. Cleaning the drain filter at least once a month will significantly reduce the likelihood of error codes like this. Remember, a fault is not the end—proper intervention can resolve it.