The E18 error on your Siemens Dishwasher means the drain pump is running continuously or water is not draining properly from the appliance. This typically indicates a blockage in the drainage system or a fault with the drain pump itself.
| Error code | E18 |
|---|---|
| Meaning | Drain pump running continuously or drainage fault |
| Severity | Medium — Dishwasher will not complete cycle and may overflow if not addressed |
| Time to fix | 15–45 minutes |
| Tools needed | Towels, bucket, flat-head screwdriver, pliers (optional) |
What the E18 error means
The E18 error code indicates that your Siemens dishwasher is experiencing a drainage problem. The appliance detects that water is not leaving the machine at the expected rate, causing the drain pump to work continuously in an attempt to empty the unit. This error prevents the dishwasher from completing its cycle and will halt operation to prevent flooding or damage to internal components.
Common causes
- Blocked or kinked drain hose preventing water from flowing out
- Clogged filter assembly at the base of the dishwasher filled with food debris
- Obstruction in the drain pump impeller caused by broken glass, bones, or other objects
- Blocked sink waste pipe or standpipe that the dishwasher drains into
- Faulty or jammed drain pump unable to expel water effectively
- Sump area blockage preventing water from reaching the pump
How to fix the E18 error
- Switch off and remove standing water: Turn off the dishwasher at the mains and open the door. Use towels and a shallow container to scoop out any standing water from the base of the machine. This makes the next steps safer and cleaner.
- Clean the filter assembly: Remove the lower spray arm by twisting it counterclockwise. Unscrew or lift out the filter assembly located at the bottom of the dishwasher. Rinse the filters thoroughly under running water to remove all food particles, grease, and debris. Check the sump area beneath the filter for any objects or buildup and clear it completely.
- Inspect the drain pump: With the filters removed, you can access the drain pump area. Look for any objects stuck in the impeller. Gently rotate the impeller with your finger to ensure it moves freely. Remove any obstructions such as glass shards, fruit stones, or plastic fragments. Be careful as some items may be sharp.
- Check the drain hose: Pull the dishwasher forward slightly to access the rear. Locate the drain hose connected to the back of the machine. Check for kinks, twists, or blockages. Disconnect the hose and run water through it to ensure it flows freely. Also check where it connects to your sink waste or standpipe for blockages.
- Verify the sink connection: If your dishwasher drains into a sink waste pipe, remove the connection and check for blockages in the sink trap or waste pipe. Food debris from the sink can create a blockage that prevents the dishwasher from draining properly.
- Reassemble and test: Replace all filters, the spray arm, and reconnect the drain hose securely. Turn the power back on and run a short rinse cycle to test if the error has cleared. Monitor the cycle to ensure water drains properly throughout.
FAQ
Can I use my Siemens dishwasher with the E18 error code showing?
No, you should not attempt to use the dishwasher when the E18 error is displayed. The error indicates a drainage fault that could lead to water remaining in the machine or potentially overflowing. Continuing to use the appliance may cause water damage to your kitchen or harm internal components.
How often should I clean the filter to prevent E18 errors?
You should clean your Siemens dishwasher filter at least once a month under normal use, or more frequently if you regularly wash heavily soiled dishes. Regular cleaning prevents food debris buildup that can lead to drainage problems and the E18 error. Always scrape plates before loading to minimize debris entering the filter system.
What if the E18 error persists after cleaning everything?
If the error continues after you have cleaned the filters, checked the drain hose, and cleared all visible blockages, the drain pump itself may be faulty and require replacement. The pump motor or pressure switch could also be defective. At this point, it is advisable to contact a qualified appliance engineer to diagnose and replace the faulty component, as this requires technical knowledge and specific parts.
