How do I fix Bosch Dishwasher Drain Pump Replacement - Signs & How-To?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Can I keep running the equipment with this fault active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for Bosch Dishwasher Drain Pump Replacement - Signs & How-To?

The most frequently replaced parts for Bosch Dishwasher Drain Pump Replacement - Signs & How-To are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is Bosch Dishwasher Drain Pump Replacement - Signs & How-To a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

Bosch Dishwasher Drain Pump Replacement - Signs & How-To

Q: What does Bosch Dishwasher Drain Pump Replacement - Signs & How-To mean?

E25 or E23 error, standing water after cycle, grinding noise from pump, or pump won't run. Replacing the drain pump fixes water evacuation issues.

Bosch Dishwasher Drain Pump Replacement — What This Part Does

The drain pump sits at the bottom of the tub under the filter assembly and evacuates dirty water out of the dishwasher through the drain hose. Bosch dishwashers throw an E25 code when the pump is blocked, the pump cover is loose or missing, or the pump cannot evacuate water. The E23 code means the pump cannot remove water, usually because debris has jammed the impeller, the pump motor has failed, or wiring connections have come loose.

Pumps fail when broken glass, food debris, or small objects (twist ties, toothpicks) lodge in the impeller and seize the motor. Over time hard-water buildup or a worn motor can also stop the pump from spinning. If the pump cover is not seated correctly, the machine will not drain and will display the same codes.

Jump to Replacement Steps

Signs It Needs Replacing

E25 error code on the display Bosch says this means the drain pump is blocked, or the drain-pump cover is loose or missing.
E23 error code on the display The pump cannot remove water, pointing to blockage, wiring issues, or pump motor failure.
Standing water in the bottom of the tub after a cycle The pump is not evacuating water because the impeller is jammed or the motor is dead.
Grinding, buzzing, or humming noise from the pump area Debris or a broken impeller is stopping the pump from turning freely.
Pump runs but no water drains out The drain hose is kinked, the disposer knock-out plug was not removed, or the pump impeller is broken.
Pump does not run at all during the drain cycle The motor winding has failed or the wiring harness to the pump is loose or corroded.

How to Replace It

Shut off power to the dishwasher at the circuit breaker and turn off the water supply valve under the sink.
Pull the dishwasher out from under the counter if you need access to the side or rear panels, then disconnect the drain hose from the sink or disposer connection to prevent spills.
Remove the lower dish rack and unscrew or lift out the cylindrical filter assembly at the bottom of the tub to expose the drain pump chamber.
Check that the pump cover (a round plastic cap over the pump impeller) is not loose or missing, then remove it and scoop out any standing water and debris with a sponge.
Spin the pump impeller by hand to confirm it turns freely without grinding or seizing, and pull out any broken glass, twist ties, or food particles jamming the blades.
If the impeller is clear but the pump still does not run, tip the machine back or remove the lower access panel (usually along the bottom edge of the front door) to reach the pump assembly underneath the tub.
Disconnect the wiring harness from the pump, release any clamps or screws holding the pump to the sump housing, and twist or pull the pump out of the housing.
Install the new drain pump by pressing it into the sump housing, securing any retaining clips or screws, and reconnecting the wiring harness until it clicks.
Reinstall the pump cover, filter assembly, and lower rack, then restore power and water and run a rinse cycle to verify the pump evacuates water and the error code clears.

The Part You Need

Part	Notes
Bosch dishwasher drain pump assembly	Amazon \| Find your model and serial number on the metal tag inside the door edge or on the left side of the tub. Cross-reference that model number with Bosch parts diagrams or an appliance parts supplier to get the exact pump part number for your unit.
Drain pump cover (if loose or missing)	Amazon \| Bosch identifies a loose or missing cover as a primary cause of E25. Check the parts diagram for your model to order the correct cover.

If this part is failing you may also see one of these codes:

When to Call a Pro

If you have cleared all debris, confirmed the impeller spins freely, and replaced the pump but the E25 or E23 code returns, the main control board may be sending incorrect signals or a wiring harness fault exists elsewhere in the machine. Diagnosing board-level faults or tracing low-voltage control wiring typically requires a schematic and a multimeter. Call a tech if you are not comfortable working inside the machine or if the dishwasher is still under warranty.