A Bosch dishwasher that isn’t draining is most often blocked at the filter, the drain hose, or the sink or garbage disposal connection. Clean the filter first, then check the hose for kinks and the disposal for a knockout plug that was never removed. If those are clear, the drain pump, its impeller, or the check valve is the likely culprit. The display may show E24 (drain timeout) or E25 (pump blocked).
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Table of contents
What Does “Not Draining” Look Like on a Bosch?
- Standing water at the bottom of the tub after a cycle.
- A drain error such as E24 or E25 on the display.
- A smell from stagnant water.
- Dishes that come out dirty or wet.
- Water coming back up from the sink.
EasyBear describes E24 as a drain-timeout fault, meaning the machine couldn’t drain within its expected time. It says the code isn’t dangerous, but standing water will start to smell. It describes the related E25 code as the drain pump reporting blocked. These meanings can differ by model, so check your manual too.
Quick Fix Order: Start Here
- Turn off power at the breaker before reaching into the machine.
- Clean the filter at the bottom of the tub.
- Straighten the drain hose if it’s kinked or pinched.
- Check the garbage disposal or sink drain and the knockout plug.
- Check the pump for debris or a stuck impeller.
- Check the check valve under the pump cover.
- Call a technician if it still won’t drain.
Causes and Fixes
1. Clogged Filter
A dirty filter is the usual first suspect. Fred’s Appliance Academy says a clogged filter is the usual culprit for an E24 code. EasyBear adds that a filter that only looks dirty can still restrict drainage, so wash it thoroughly.
Fix: Remove the bottom rack and spray arm, twist out the filter, and wash it in warm soapy water. Remove debris such as paper labels from jars, which Sears Home Services says can block it.
2. Kinked or Blocked Drain Hose
EasyBear lists a kinked drain hose as the most common cause on its list. It can be pinched by a drawer box, crushed against a wall, or dropped out of its high loop. Sears Home Services notes the hose or its check valve may be blocked or cracked, letting water flow back into the tub.
Fix: Turn off power, pull the dishwasher out, and straighten or clear the hose.
3. Garbage Disposal Knockout Plug (New Disposal or New Installation)
If your dishwasher drains into a disposal and has never drained properly after a new installation, the knockout plug may still be in place. EasyBear says a plug still in the outlet blocks it completely. Paradise Appliance Service also lists this as an installation problem.
Fix: Remove the plug from the disposal inlet. Also run the disposal and clear any clog in the shared drain line.
4. Clogged Sink Drain or Air Gap
Sears Home Services recommends running water and the disposal to check the sink drain. If you have an air gap, look for water coming from its vent holes. If it’s clogged, clear the hose with a snake, air, or a wet/dry vac.
5. Grease Clog in the Drain Line
Sears Home Services suggests disconnecting the drain hose at the sink or disposal connection, clearing any grease at the end, and reinstalling it.
6. Jammed or Failed Drain Pump
Debris such as glass or bone fragments can jam the impeller. Fred’s Appliance Academy advises unclipping the pump cover, looking for blockages, and checking that the impeller spins freely, since a stiff impeller suggests a faulty pump. Wear gloves, because broken glass can be in there.
Sears Home Services names the drain pump and the pump-and-motor assembly as the two most common causes in its data (about 31% and 25%), and notes a grinding or whining noise can be a sign. Those figures come from one company’s service data, not an industry standard.
Fix: Clear any blockage. If the impeller is damaged, Paradise Appliance Service says to replace the whole pump, since the impeller can’t be swapped on its own.
7. Faulty Check Valve
Paradise Appliance Service describes the check valve as a small rubber component under the pump cover in the filter housing. If it’s damaged or stuck, water can flow back into the tub.
Fix: Remove the pump cover, take out the valve, inspect and clean it, and replace it if worn.
8. Unlevel Dishwasher or Missing High Loop
Paradise Appliance Service lists an unlevel unit (water pooling in one corner) and a loose, low or missing drain hose high loop as installation causes.
Fix: Use a spirit level and the leveling legs, and secure the hose at the correct height.
9. Control Board Fault
Fred’s Appliance Academy says a defective control board is a less common cause. If the code persists after all the other checks, have a technician look at it.
Which Cause Is It? Symptom Guide
| What you notice | Most likely cause |
| Water standing, dirty filter | Clogged filter |
| Never drained since installation | Disposal knockout plug or hose installation |
| E24 after a cleaning, hose pushed in | Kinked or pinched drain hose |
| Grinding or humming from the pump | Jammed impeller or failing pump motor |
| Water flows back into the tub | Check valve or hose high loop |
| Sink gurgles as dishwasher runs | Clogged sink drain or air gap |
| Everything checks out, E24 stays | Pump or control board |
How to Clean the Filter and Check the Pump (DIY)
- Turn off power and take out the bottom rack.
- Remove the spray arm if it blocks access, then twist out the filter.
- Wash the filter in warm soapy water.
- While it’s out, look in the sump for glass, bones, or labels.
- If your model has a pump cover you can unclip, check for blockages and make sure the impeller spins freely.
- Put everything back and run the drain cycle. Sears Home Services notes that pressing Cancel (or starting a cycle and pressing Cancel) runs the drain pump, usually for about three minutes.
If the pump is hard to reach on your model, don’t force it.
When to Call a Technician
- The filter, hose, disposal, and sink drain are clear, and water still stays.
- You hear grinding, or the pump doesn’t run.
- You need to remove the kick panel, test electrical continuity, or replace the pump.
- E24 returns right after you clear it.
Sears Home Services recommends a professional diagnosis before replacing parts if the DIY steps don’t fix the problem, noting the drain pump is hard to access, and the hose and check valve are difficult to reach. EasyBear gives a typical professional repair as “up to $280” and says most E24 causes (a kinked hose, dirty filter, or leftover plug) cost nothing to fix yourself. Treat those costs as a rough guide from a repair company.
How to Prevent Drain Problems
- Clean the filter monthly.
- Scrape plates and remove labels, bones, and glass before loading.
- Run a dishwasher cleaner periodically.
- Run the disposal before starting the dishwasher.
- Check the hose isn’t pinched when you push the unit back after servicing.
- Keep the machine level.
Frequently Asked Questions
Why is my Bosch dishwasher not draining?
The common causes are a clogged filter, a kinked or blocked drain hose, a blocked garbage disposal or sink drain, a disposal knockout plug that was never removed, or a failed drain pump or check valve.
What does E24 mean on a Bosch dishwasher?
It means the dishwasher didn’t drain within the expected time. E25 usually means the drain pump is blocked.
How do I clear a Bosch dishwasher that has standing water?
Turn off the power, clean the filter, check the hose for kinks, clear the sink and disposal, and check the pump for debris. Then run the drain cycle.
Can a garbage disposal stop a Bosch dishwasher from draining?
Yes. A clogged disposal, or a knockout plug that was never punched out on a new disposal, can block the dishwasher’s outlet.
Where is the Bosch dishwasher drain filter?
At the bottom of the tub, under the bottom rack. Remove the rack and twist out the filter.
Can I reset the drain pump on a Bosch?
You can run the pump by pressing cancel, or starting a cycle and then pressing cancel. It usually runs for about three minutes on most models.
What if the filter is clean and it still won’t drain?
Check the drain hose, the disposal knockout plug, the sink drain, and the pump impeller, then the check valve.
How much does it cost to fix a Bosch dishwasher that won’t drain?
Many causes cost nothing to fix yourself. One repair company puts a typical professional repair at up to about $280.
Is it safe to run a dishwasher with standing water?
It’s best not to. Standing water smells and means the machine isn’t cleaning properly. Find the blockage first.
Can an unlevel dishwasher cause drainage problems?
Yes. One service company lists an unlevel unit as a cause because water can pool in a corner.
Conclusion
When a Bosch dishwasher won’t drain, work from the easiest and most common causes to the hardest. Clean the filter, straighten the drain hose, and check the sink drain and garbage disposal, including the knockout plug on a new installation. Then look at the pump impeller and the check valve. Most of these fixes cost nothing and take less than an hour. If the water still stays after those checks, or the pump is silent or grinding, it’s time to have a technician test the pump and control board rather than guessing at parts.
