How to Replace a Bosch Dishwasher Drain Pump (BSH
Replacing the drain pump on a Bosch dishwasher is an intermediate, 45-60 minute job. When you see an E24 or E25 code and clearing the impeller does not help, the pump motor itself has gone; you tip the unit onto its back, drop the base plate, and twist the old pump out of the sump.
Bosch runs one universal drain pump (part BSH 00631200) across the 300, 500, and 800 series built since 2010, so sourcing is easy. A dead pump shows up as a continuous hum with no water moving, silence where the drain should run, or codes that stay after the filter and impeller are clean.
Tools and parts#
| Item | Use |
|---|---|
| Torx T20 and T15 drivers | Kick plate, base plate, pump bracket |
| 10mm socket, needle-nose pliers | Supply line and clamps |
| Towels, shallow pan | Residual water |
| Drain pump BSH 00631200 | The replacement |
Safety warning: Disconnect power at the circuit breaker and shut off the water supply. The base of the dishwasher may contain standing water from the AquaStop system — have towels ready. The old pump may have sharp edges where the impeller housing cracked.
Do You Have the Right Tools?
Water pressure gauge ($60), spray arm tester, float switch multimeter ($85), and drain inspection camera. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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Step-by-step#
1. Ready the area#
Cut power and close the hot-water supply under the sink. Open the door, pull the racks and the triple-filter (quarter-turn counterclockwise), and sponge or vacuum any standing water from the sump. Lay thick towels across the floor in front of the unit.
2. Drop the kick plate#
Remove the two Torx T20 screws at the bottom of the kick plate, slide it forward a fraction, then pull it down and off to expose the base.
3. Free the unit from the counter#
Open the door and remove the two countertop mounting screws at the top of the opening, then close it and slide the dishwasher forward eight to twelve inches. If the supply line and drain hose lack slack, disconnect the supply line first with the 10mm wrench over a towel.
4. Tip it onto its back#
With a helper, lay a blanket or cardboard behind the unit and tip it back onto it so the base plate faces up. If the machine had an E15 leak, water trapped in the base pan pours out here, so tip slowly with towels ready.
5. Remove the base plate#
Take out the four to six Torx T20 screws around its edge (some models add push-clips) and lift the plate away, exposing the drain pump, circulation pump, harness, and the AquaStop float. Photograph the layout for reassembly.
6. Disconnect the drain pump#
The drain pump is the smaller motor, about three inches across, on the sump output side. Press the tab on its two-wire plug and pull it off, then squeeze the spring clamp on the outlet hose, slide it back, and pull the hose free over your pan.
7. Twist the pump out of the sump#
The pump locks to the sump by a bayonet (quarter-turn counterclockwise) or a bracket with two or three Torx T15 screws. On most 300/500/800 units, grip the body and rotate it about thirty degrees until the tabs clear, then pull it straight out. Note which way the O-ring seal faces.
8. Prep the new pump#
Set the new BSH 00631200 beside the old one and confirm the connector, mounting tabs, and outlet diameter match. Move the O-ring over if the replacement lacks one, and smear it with a little silicone grease for a better seal.
9. Install and lock it in#
Line the new pump's tabs with the slots, push in firmly, and rotate clockwise until it clicks home. Push the outlet hose fully onto the barb and slide the clamp back over it, then reseat the electrical plug until it clicks.
10. Reassemble and test#
Refit the base plate, stand the unit upright, reconnect the supply line (hand-tight plus a quarter turn), slide it back under the counter, and refit the countertop screws, kick plate, and triple-filter. Open the water, restore power, run a Rinse cycle, and check the pump area with a flashlight after five minutes.
Verifying the repair#
- E24 and E25 should not return.
- No water appears under or in front of the unit.
- The drain is a brief whir at the end of each phase, not a constant hum.
- The sump holds only a thin film of water after the final drain, not a pool.
Safety First — Know the Risks
Live 120V wiring in a wet environment is one of the most dangerous DIY scenarios. Water + electricity = serious shock risk. Our techs are licensed and insured — let them handle the risk.
Licensed & Insured · 90-Day Warranty · Same-Day Service
When to call a professional#
EasyBear technicians serving Sacramento and the Bay Area carry Bosch-specific diagnostic tools and replacement parts on every service call. Call one if the sump housing itself is cracked, if you cannot tip the 90-plus-lb unit safely, if the larger circulation pump also shows signs of failure, or if an E15 appears alongside the E24, pointing to a leak beyond the drain pump.
Need Professional Help?#
Want a professional to handle it? Our Bosch-certified technicians are available today. Book a free diagnostic.
Appliance Repair Technician · 8 years experience
Experienced technician with 8 years specializing in dishwasher repairs and European appliance brands including Bosch and Thermador.
