The Bosch washing machine E18 error code means that the washer is taking too long to drain, or cannot drain the water at all. Fortunately, this is rarely a broken part and is almost always caused by a blockage in the drain pump filter or a kinked drain hose.
⚠️ SAFETY FIRST: Before you begin troubleshooting, unplug the washing machine from the power outlet. Keep a few large towels and a shallow container nearby, as you will need to catch trapped water.
What Causes the Bosch washing machine E18 error?
When your Bosch washer displays the E18 code, the water path is restricted. The most common causes are:
- Clogged drain pump filter: Coins, hair clips, lint, or small socks often bypass the drum and get stuck in the filter at the bottom of the machine.
- Blocked drain hose: The corrugated grey hose at the back of the washer might be bent, crushed, or clogged with gunk where it connects to your home’s plumbing.
- Jammed pump impeller: A small object may have passed through the filter and physically jammed the spinning blade (impeller) of the drain pump.
- Faulty drain pump: In rare cases, the electronic pump motor has burned out and needs replacement.
How to Fix Bosch Washing Machine E18 Error Step-by-Step
You can usually clear the E18 error in less than 15 minutes by following these steps:
- Check the Drain Hose: Look behind the washer and ensure the drain hose is not kinked or pinched against the wall. Ensure it is not pushed too deep into the wall standpipe.
- Locate the Pump Filter: Open the small service flap at the bottom right corner of the front of your Bosch washer.
- Drain the Emergency Water: Pull out the small black emergency drain hose. Remove its cap and let the trapped water flow into a shallow container. Take your time here to prevent a flood on your floor.
- Clean the Filter and Impeller: Once the water is drained, slowly unscrew the large round pump cover. Pull out the filter and wash it under the sink. Shine a flashlight inside the hole and ensure the plastic fan blade (impeller) at the back can spin freely with your finger.
How to Reset a Bosch Washing Machine (Soft Reset)
After cleaning the filter and reassembling everything tightly, you can reset the machine to clear the code. Turn the dial to the “Off” position. Unplug the washing machine from the wall for 3 minutes. Plug it back in, select a quick “Spin/Drain” cycle, and press start to ensure the water pumps out completely.
When to call a professional?
If the filter is spotless, the hose is clear, and the pump impeller spins freely, but the machine still gives an E18 error and refuses to drain, the drain pump motor is likely dead. Replacing the pump requires removing the front panel of the washing machine. At this point, it is safest to contact a certified local appliance technician to diagnose the electrical issue and replace the part.