Fixing Bosch Dishwasher Draining Issues
Bosch Dishwasher Not Draining
After our built-in Bosch dishwasher ran a washing cycle, the bottom of the dishwasher was still full of dirty, free-standing water.
Here's how it's supposed to work: There is a drain pump in the dishwasher that pushes the water out through a drain hose which typically runs from the dishwasher to either the sink's garbage disposal or the air gap. (Our air gap fits on the top of our sink. From there, another hose connects to the garbage disposal.)
If your dishwasher is not draining, something along this pathway is blocked or broken. Here are the troubleshooting steps to take:
1. Check the Filter Inside the Dishwasher (Before Checking the Air Gap or Detaching the Drain Hose)
There is a screen in the dishwasher that is supposed to block large debris from going into the drain hose, but sometimes pieces of food get through and clog the hose. The video below shows you how to check and clean the filter. If you find a big piece of food or glass, remove it and then run the rinse cycle to see if the dishwasher drains. If it still doesn't drain, move to the next step.
2. Check the Air Gap for Clogs
The most common problem that prevents a Bosch dishwasher from draining is small bits of food caught in the air gap. Luckily, this is very easy to fix.
- Locate your air gap. It's usually a little hood or cylinder at the back of your sink.
- Remove the cover. Most just unscrew or pop off by hand, but some have a small screw that holds it in place.
- The top of the air gap has a small piece that can be removed by depressing the small hooks. Remove the top and clean out anything clogged inside.
How it's supposed to work: Water is pumped from the dishwasher up through the air gap (that's the built-in plastic tube) and then usually down through a larger hose to the garbage disposal. The problem is that when the water hits the top of the air gap, small bits of food get stuck between the plastic lid and the built-in tube. This prevents the hose from working efficiently so the dishwasher doesn't completely drain. It's amazing what a huge problem a tiny bit of food can cause.
If you remove a bunch of debris, the problem is likely solved. Run the dishwasher on the rinse cycle and see if all the water is pumped out.
If not, proceed to the next step.
3. Check the Drain Hose for a Clog
To detach a drain hose from the air gap, you'll need...
- a bucket to hold the water that will run out of the hose
- screwdriver to remove the drain hose from the air gap
Using a screwdriver and the pliers, disconnect the drain hose that is attached to the air gap and empty the water to see if the hose is blocked.
To see if the drain hose is blocked, run the dishwasher on the rinse cycle again and hold the hose over the bucket. If the dishwasher doesn't drain, then the drain hose is blocked.
If the hose is obstructed, you might try to use a hanger to push out the clog. However, most drain hoses connect behind a wall and the dishwasher may have to be removed fully to inspect the drain hose. At this point, it's likely that a plumber will need to be called.
Air Gap Disconnected fro Drain Hose and Garbage Disposal
Questions & Answers
What is the check valve on drain hose and what does it do?
A check valve is sometimes used in place of an air gap. Its purpose is to prevent water from flowing back in the opposite direction.
My Bosch dishwasher keeps coming up with either "E18" or "E14" on the display. It did not empty and had a large pool of water in the bottom. Any suggestions?
These errors aren't associated with a draining issue, but rather a flow issue and a water level issue. Likely something is preventing enough water to flow in to the dishwasher.
What is Bosch e23 code?
An e23 error on a Bosch dishwasher is an electrical problem with the drain pump. It may require replacing the drain pump.
© 2010 Paul Edmondson