Bosch Washing Machine E18 Error Code: Drain Fault Fix

Quick Answer

E18 on a Bosch washer indicates a drain timeout, meaning the water isn't leaving the drum fast enough. Usually, this is caused by a clogged drain pump filter or a kinked discharge hose behind the machine. Empty the water via the small hose at the bottom, then unscrew and clean the large round filter to fix it.

I've cleared more E18 codes than I can count over fifteen years. It's almost never a broken part. Nine times out of ten it's a coin, a bra underwire, or a matted clump of hair and lint that's been building up in the filter for months. It looks scary when your drum's full of water and the door won't budge, but you can usually fix this in under thirty minutes with just a couple towels and a shallow tray.

BoschWasherSeverity: moderate92% DIY Success

Time to Fix

20–45 min

Difficulty

beginner

Parts Cost

$45 – $85

Tools Needed

Shallow container or tray (a baking sheet or litter tray works perfectly), Several old towels

What Does the E18 Code Mean?

OK so the E18 is basically your washer saying it's been trying to drain for too long and it's giving up. The control board gives the pump a set window to empty the drum, usually around 8-10 minutes. If the water doesn't drop far enough in that time, it shuts everything down to protect the pump motor. It's a protective thing, honestly. And in most cases it's a filter full of junk, not a dead pump.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Blocked drain pump filter65%

Kinked or blocked drain hose15%

Failed drain pump motor10%

External plumbing blockage7%

Control board fault3%

Symptoms You May Notice

Water's just sitting in the drum at the end of the cycle, sometimes several inches deep, and the machine won't respond to anything.
There's a loud, angry humming or growling during the drain phase, like the pump is really straining against something it can't push through.
The cycle stops dead before spin and the timer just sits there, not counting down.
Door's locked solid and won't open no matter what button you press.
E18 or F18 is flashing on the display.

Can you reset a Bosch washer to clear the E18 code?

Once you've cleared whatever was blocking things, turn the program dial all the way to 'Off' and wait a full 30 seconds. Then dial it to a quick rinse and spin cycle and let it run. If the drain works, the E18 clears on its own. If it doesn't, unplug the machine from the wall for 5 minutes to let the control board fully reset. Plug back in and try again.

Tools Required for Diagnosis

Shallow container or tray (a baking sheet or litter tray works perfectly)Several old towelsFlathead screwdriver (to pry open the access panel)Needle-nose pliers (for fishing debris out of the impeller)Long flexible drain brush (for clearing standpipe buildup)Old toothbrush (for scrubbing slime off the filter)Multimeter (set to ohms, only needed if testing the pump motor)

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

ComponentComponent Under Test

Expected Range150–300 ohms

ConditionIf Open (OL) or infinite, replace component.

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Drain Pump Assembly00145787 · $45–$85	00145787	$45 – $85

Frequently Asked Questions

Can I bypass the E18 error to finish my load?

Nope. The E18 is a hard stop and the machine won't run any cycle while it's triggered. It's there to protect the pump motor and prevent overflow. Repeatedly restarting without fixing the drain issue can actually damage the control board on older machines, which turns a twenty-dollar filter clean into a two-hundred-dollar repair. Just deal with the drain first and you'll be back up and running fast.

How do I unlock the door when E18 is displayed?

Bosch won't release the door lock if it thinks there's still water in the drum, because water plus open door equals a flood on your floor. You've got to drain the drum first using that emergency hose behind the bottom service flap. Once the water's gone, the pressure switch signals the door lock to release. If it still won't open after draining, look near the filter housing for a small plastic pull-tab. Pull it downward firmly and that'll manually pop the door latch.

Why does my Bosch washer keep getting E18 every few months?

Two most common reasons. Either you're using too much detergent, which causes oversudsing and can basically airlock the pump, or you're washing things that shed a lot of debris like pet blankets, rugs, or work clothes with full pockets. Switch to an HE detergent and use less than you think you need. And clean that filter every three months. Seriously, put a reminder in your phone right now. Most people never do it and then wonder why their washer keeps throwing the same code.

Is E18 the same as F18?

Yeah, same exact fault. Older Bosch models display it as F18, newer ones tend to show E18. It's the same drain timeout error and everything here applies to both. Don't let the different letter throw you off.

How much does it cost to replace a Bosch drain pump?

If you've gone through all the steps and the pump's actually dead, a genuine Bosch replacement pump usually runs $60-$120 depending on your model. Aftermarket ones are cheaper, around $35-60, but I've had mixed results with those on Bosch machines specifically. Labor from a tech runs another $80-150 on top of parts. Still worth fixing though, since a comparable new Bosch washer is going to run you $700 and up. Check your serial tag on the door frame and use that to cross-reference the exact pump part number.

Related Bosch Washer Error Codes

Code: E17Bosch Washer E17: Water Intake Fault Code: E23Bosch Washer E23: Water in Base

Models Known to Experience E18 Errors

This repair applies to most Bosch washers with this error code. Common model numbers include:

WAE24061GB, WAN28201GB, WAT28400UC, WAW285H2UC, WAY28791GB, WGG24400GB, WIW28301GB

Written by

Mike Sullivan

Lead Appliance Repair Technician · 20 years experience

Last verified for technical accuracy on May 20, 2024