What does Bosch Washer Not Draining Completely - Causes & Fix mean?

Clogged drain pump filter is the most common cause. Clean the filter first, then check the drain hose and pump for blockages or failure.

How do I fix Bosch Washer Not Draining Completely - Causes & Fix?

Work through the step-by-step fix below. Start with the quick reset and the most common cause, then check the specific part this guide points to. Most fixes need only basic hand tools and the right replacement part.

Can I keep using my Bosch appliance with this error showing?

Usually not. Bosch appliances show this error when a part or safety circuit is out of range, so running it can stop the cycle or make the problem worse. Diagnose and clear the error before normal use.

What part is most commonly replaced for Bosch Washer Not Draining Completely - Causes & Fix?

The parts that most often fix Bosch Washer Not Draining Completely - Causes & Fix are listed in the parts section of this guide. Match the part to your exact model and serial number before you buy.

Is Bosch Washer Not Draining Completely - Causes & Fix a DIY repair or do I need a technician?

Many fixes are DIY-friendly with basic tools, such as door switches, drain pumps, water inlet valves, thermostats, heating elements, and filters. Sealed-system, refrigerant, gas, or high-voltage work should go to a licensed technician for safety.

Bosch Washer Not Draining Completely - Causes & Fix

Bosch Washer Not Draining Completely — What’s Happening

A Bosch washer that does not drain completely means the machine has detected water still present after the drain phase. On many Bosch models this triggers a drain-related fault code such as E18, E36-10, or E03 depending on the platform and generation, though some machines display a generic drainage problem instead. The practical meaning is the same: the control system could not empty the tub within the allowed time, so the cause is in the drain path, the pump itself, or the control circuit powering the pump.

Jump to Fix

Most Likely Causes

Clogged drain pump filter Lint, coins, debris, or small objects accumulate in the filter and prevent water from reaching the pump.
Blocked or kinked drain hose The external drain hose is kinked, collapsed, or clogged, restricting outflow from the pump.
Foreign object in pump impeller or housing A sock, coin, or small part is jammed in the impeller or pump body, preventing it from spinning freely.
Failed or weak drain pump motor The pump hums or makes noise but does not move water effectively, indicating a worn or failed motor.
Internal hose restriction The sump hose or internal drain tubing between the tub and pump is pinched, blocked, or collapsed.
Control board or wiring fault The pump is good but receives no power during the drain cycle due to a faulty control board or broken wire.

How to Diagnose and Fix

Unplug the washer and turn off water supply before starting any service work.
Locate and open the drain pump filter access panel, usually at the front lower corner of the machine.
Place towels or a shallow pan under the filter area, then slowly unscrew the filter to drain residual water and inspect for debris, coins, or foreign objects.
Clean the filter thoroughly and check inside the pump housing with a flashlight for trapped items or a jammed impeller.
Inspect the external drain hose for kinks, clogs, or collapse along its entire length and verify it is not inserted too far into the standpipe.
Check internal hoses between the tub, sump, and pump for pinch points or blockages if the filter and external hose are clear.
Run a drain command or short spin cycle and listen to confirm the pump runs and moves water, or measure voltage at the pump connector if the pump does not activate.
If voltage is present but the pump does not run or runs weakly, replace the drain pump assembly.

Parts You Might Need

Part	Notes
Drain pump filter	Amazon \| Also called coin trap, cleans or replaces if damaged.
Drain pump assembly	Amazon \| Complete motor and housing unit, verify voltage model (typically 230-240 V AC on Bosch).
Sump hose	Amazon \| Internal hose from tub to pump, replace if pinched or cracked.
External drain hose	Amazon \| Outlet hose from pump to standpipe, replace if kinked or split.

If your appliance also shows a code on the display, these match this problem:

When to Call a Pro

Call a technician if you have confirmed the filter, hoses, and pump impeller are clear but the pump still does not run, or if the pump receives no voltage and you are not comfortable diagnosing wiring or control board faults. If the machine requires disassembly beyond the filter door to reach internal hoses or the pump mounting, and you lack experience with front-load washer cabinet removal, professional service will save time and prevent damage to clips or seals.