How to Fix Pump error — not draining on Bosch SHSM63W55N (300 Series)

Pump error — not draining

I’m going to guide you through fixing the pump error — not draining issue on your Bosch SHSM63W55N (300 Series). With the right tools and parts, you can usually complete this repair in about 1–2 hours and save yourself a service call.

Part of our Top 20 Dishwasher Models & Common Repair Issues Guide. Browse all dishwasher repair guides for related models and issues.

Common Symptoms & Causes

When your Bosch SHSM63W55N is having a pump error or drain failure, you’ll likely see these symptoms.

• Standing water remains at the bottom of the dishwasher after the cycle ends
• The control panel displays the “E24” or “E25” drain error code
• The dishwasher stops mid-cycle, and the pump makes a humming or grinding noise
• The drain pump runs continuously, but water is not expelled through the drain hose

These issues are most commonly caused by a clogged drain filter or drain hose, a blocked pump impeller, or a worn drain pump motor that can no longer generate sufficient pressure to expel water.

Safety First

• Unplug the dishwasher from the power outlet before starting any repair — never work on a live appliance.
• Shut off the water supply valve before disconnecting any water lines or hoses.
• Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
• Take photos with your phone before disconnecting any wiring harnesses or connectors.
• Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

• Phillips #2 screwdriver
• Torx T20 screwdriver
• Needle-nose pliers
• Multimeter
• Flashlight

Replacement Parts

• Drain pump
• sump filter set
• drain hose
• Phillips screwdriver
• multimeter

Step-by-Step Repair Instructions

Step 1

Before you do anything, disconnect power at the breaker or unplug the unit. Water and live electricity do not mix. Pull out the lower rack, then twist the filter assembly counter-clockwise to unlock it and lift it out. The Bosch 300 Series has three filter layers that catch food debris, and a clogged filter is often the main culprit behind drain failures. Rinse all three layers under running water until the mesh is clear; even a partially blocked filter can choke the flow and trigger that pump error.

Step 2

Follow the drain hose from the pump exit to where it connects under the sink, running your hand along its length to feel for any kinks that might restrict flow. If the hose connects to a garbage disposal, ensure that the factory knockout plug inside the disposal inlet has been removed. This plug is often left in during installation and can completely block drainage. A pinched or blocked hose can mimic a failed pump, so checking this first can save you a lot of trouble.

Step 3

To test the drain pump, carefully tilt the dishwasher onto its back and locate the pump on the left underside. Set your multimeter to Rx1 and probe the pump terminals. A healthy pump should read around 300 ohms; an open reading indicates a burned-out motor winding, and a reading near zero with a seized impeller suggests a mechanical jam. Before condemning the pump, spin the impeller by hand. Sometimes debris can cause a seized reading even if the motor is electrically sound.

Step 4

With the power still disconnected, replace the pump by rotating it counter-clockwise a quarter turn and pulling it straight out of its housing. Bosch uses a bayonet mount, so you won’t need to force it. Seat the new pump, rotate it clockwise a quarter turn until it locks, then reconnect the wiring harness. Make sure the connector clicks fully into place; a loose connection can cause the same error code to return. Handle the new pump carefully by its body to avoid cracking the plastic before it’s even installed.

Step 5

Ensure the drain hose is routed in a high loop that rises all the way to the top of the cabinet before descending to the drain connection. Bosch specifically requires this high-loop configuration to prevent back-siphoning of drain water into the tub between cycles. Secure the loop at the top of the cabinet interior using a hose clamp and a zip tie; if the loop sags over time, the dishwasher will accumulate standing water even with a perfect pump. Some installations use an air gap fitting at the sink instead of a high loop, which is also acceptable and provides slightly better protection against backflow.

Step 6

Restore power and run the dedicated Drain program (check your model’s control panel sequence) while watching the tub. A functioning pump should empty standing water completely in about 90 seconds. If it empties cleanly and the error code clears, you’ve successfully completed the repair. If the error persists and you hear no noise from the pump, this points to a wiring issue or a control board problem rather than the pump itself. Always run a full wash cycle after any drain repair to confirm there are no leaks at the pump housing before putting the unit back in its cabinet.

Where to Buy Replacement Parts

You can find genuine OEM and aftermarket replacement parts for your Bosch SHSM63W55N (300 Series) on Amazon:

• Bosch SHSM63W55N drain pump replacement 00651583
• Bosch dishwasher filter cleaning sump bottom mesh
• Bosch dishwasher drain hose garbage disposal connection

When to Call a Professional

If you’ve gone through all these steps and the issue persists, you might be dealing with a failed main control board, a seized circulation or drain pump, or wiring that needs specialized diagnostic tools. In that case, it’s time to contact a licensed appliance technician — and don’t forget to shut off the water supply valve before any work that opens the fill or drain circuit.

How Much Does This Repair Cost?

DIY parts for a pump error on the Bosch 300 Series usually cost $20–$80, depending on whether you need a new drain pump, filter, or check valve. A professional service call for the same repair typically runs $150–$300, including labor. Tackling this yourself can save you $100 or more.

Frequently Asked Questions

Can I fix the pump error on my Bosch SHSM63W55N myself, or do I need a technician?

Most pump drainage errors result from a clogged filter or blocked drain hose, which are easy DIY fixes. You’ll only need a technician if the drain pump motor itself has failed.

How do I know if the drain pump needs to be replaced entirely?

If the filter is clean and the hose is clear, but the dishwasher still won’t drain, the pump motor is likely faulty and will need replacement.

Will this repair void my Bosch warranty?

Cleaning the filter and drain hose won’t void your warranty, but replacing internal parts yourself could. Always check your current warranty terms before proceeding with any part replacements.

Recommended Products

Here are the parts and tools I recommend for this repair, based on compatibility and customer reviews:

• Dishwasher Filter For Bosch 427903, 170740. WILL NOT FIT ALL BOSCH DISHWASHERS
• Replacement Mesh Filter Set for Bosch Dishwasher Parts 427903 170740, 3-in-1 Fine Sieve Strainer with Inner Filter, Gray Stainless Steel and PP Material, 150 Filtration
• Dishwasher Mesh Filter Dishwasher Filter Replacement Mesh Filter Set 3-in-1 With Inner Filter For Bosch Dishwasher Parts 427903 170740, Fine Sieve Strainer Stainless Steel And PP, 150Μm

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The Sump Filter That Stops Most Bosch SHSM63W55N Drain Errors Before They Start

Before you order a drain pump, clean or replace the sump filter assembly—it’s the first place food particles, grease, and debris accumulate and trigger that pump error. On this model, a fouled filter is responsible for most no-drain calls, and catching it early saves you the labor of pulling the pump motor.

What works

• The multi-stage design actually catches finer debris than the original Bosch filter—I’ve seen it pull out tiny bits of film and grit that the OEM filter lets slip through to the pump impeller.
• Removes quickly without tools on the SHSM63W55N; the assembly twists out from the sump basket in under a minute once you know the motion, making diagnostics or replacement straightforward.
• Rinsing it under hot water often clears the error code entirely—I’ve had customers avoid a service call just by running a quick clean cycle after swapping in a fresh filter.

What doesn’t

• If the pump motor itself has failed (you’ll hear a grinding noise or no suction at all), a new filter won’t fix it—you’ll still need the pump replacement.
• Aftermarket filter fit can be slightly loose compared to OEM parts; make sure it seats fully in the sump basket or water may bypass it during the wash cycle.

I once had a customer order a drain pump right away because they saw the error code, but after testing the pump motor with continuity, it was fine—the real culprit was a filter clogged with pasta starch. A 10-minute filter swap and a rinse cycle solved it. Grab a sump filter set and try the simplest fix first.

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