Cormac Hale Key Takeaways
- Some water in the sump is normal after a cycle , complete emptiness isn't expected
- A clogged filter is the most common cause of incomplete draining in Bosch dishwashers
- Error codes E22 and E24 point directly to filter or drain pump issues
- If cleaning the filter doesn't fix it, you likely need a technician
The Bottom Line
A Bosch dishwasher that doesn't drain completely usually has a clogged filter or blocked drain hose. Clean the filter first , it's the most common fix and takes about 10 minutes.
Is It Actually a Problem? Normal vs. Not Normal
Here's something most people don't realize: some water left in the sump after a cycle is completely normal. Bosch designs their dishwashers to retain a small amount of water at the base. The filter area might have a little standing water , that's by design.
The problem is when you open the door and find the filter area completely flooded, or when there's standing water that sits for days. That's not normal. That's a drainage issue.
The threshold:
If water rises above the filter screen or pools at the door seal after every single cycle, something is blocking the drain.
What Causes a Bosch Dishwasher to Not Drain Fully?
Three things cause most drainage failures in Bosch dishwashers. Ranked by frequency:
- Clogged filter , Food particles, grease, and debris accumulate in the filter over time. This is the number one cause.
- Blocked drain hose , The hose that carries water to the sink drain can kink, clog, or freeze if routed incorrectly.
- Faulty drain pump , The pump itself fails, though this is less common than the first two.
Foreign objects like glass shards, fruit pits, or bones can also jam the pump impeller. Bosch repair guides note that slivers of glass are a frequent culprit.
How to Check and Clean the Filter
Turn off the dishwasher and unplug it before you start. Safety first.
The filter sits at the base of the dishwasher tub, usually near the spray arm. Here's the step-by-step:
- Remove the bottom rack to access the filter.
- Twist or unlock the filter unit and pull it out carefully.
- Separate the cylindrical filter from the flat filter plate.
- Rinse both parts under hot running water.
- Use a soft brush to scrub the inside of the cylindrical filter.
- Reassemble and lock the filter back into place.
This takes about 10 minutes. Do it once a month if you run the dishwasher frequently. It's the single best maintenance task for preventing drainage problems.
What About the Drain Hose?
If cleaning the filter doesn't solve it, check the drain hose next. The hose must form a high loop , it routes from the dishwasher up to the underside of the counter, then down to the sink drain. This loop prevents backflow from the sink into the dishwasher.
Common hose problems:
- Kinks from improper installation
- Clogs from accumulated gunk
- Disconnection from the sink drain or air gap
Pull the dishwasher out slightly (or remove the kick plate) to inspect the hose. If you see a kink, that's likely your problem. Straighten it and run a cycle.
What the Error Codes Mean
Bosch dishwashers display specific codes when there's a drainage issue. These are the ones to know:
| Code | Meaning | What to Do |
|---|---|---|
| E22 | Filter blocked | Remove and clean the filter under running water |
| E24 | Drainage blocked or pump issue | Check drain hose and pump for obstructions |
| E15 | Water in base pan (AquaStop tripped) | Turn off water supply , indicates a leak, call a pro |
Verify these codes against your model's manual. Different Bosch dishwasher series may have slight variations in how codes display.
When to Call a Technician
You should call a pro if:
- Cleaning the filter and checking the hose don't fix the problem
- You see error code E15 , this means water leaked into the base pan and the AquaStop valve shut off the water
- The drain pump hums but doesn't pump water , the pump may be failed
- There's a persistent error code that clears and returns
Professional repair for a drain pump replacement typically runs a few hundred dollars. If your dishwasher is over 10 years old, weigh the repair cost against replacement. A new Bosch dishwasher starts around $600 and goes up from there.
How to Prevent This From Happening Again
Most clogs are preventable with basic habits:
- Scrape plates before loading. You don't need to pre-rinse , just remove large food scraps.
- Clean the filter monthly. Takes 10 minutes and prevents most drainage issues.
- Run hot water at the sink before starting the dishwasher. This helps flush the drain line.
- Use dishwasher detergent, not dish soap. Regular dish soap creates excess foam that can interfere with drainage.
Frequently Asked Questions
Is it normal for water to remain in the dishwasher after a cycle?
A small amount of water in the sump is normal. If the filter area is completely flooded or water pools at the door seal, that's a problem.
How often should I clean my Bosch dishwasher filter?
Once a month if you run the dishwasher regularly. If you run it less frequently, clean it every 10-15 cycles.
Can I use my dishwasher if it's not draining properly?
Don't run another cycle until you fix it. Standing water can cause odors, mold, and potentially damage the pump if debris gets stuck in the impeller.
What's the high loop, and why does it matter?
The drain hose must loop up to the underside of your counter before dropping to the sink drain. This prevents dirty sink water from flowing back into the dishwasher. If your dishwasher was installed without a high loop, that's a common cause of drainage problems.
Related Resources
- Boschrepairguide Repair Guide Dishwasher Error Codes
- Schedule Boschrepairguide Repair Guide Dishwasher Repair
- Boschrepairguide Repair Guide Repair Guides
For more information, visit Boschrepairguide Repair Guide Official Support.