How To Resolve The BOSCH Dishwasher E24 Error Code

May 14, 2025
Doctor Appliance Blogs & Appliance Tips

If your BOSCH dishwasher is displaying the E24 error, that means the dishwasher is not draining properly. It’s one of the most common issues and, in many cases, a simple fix. But to resolve the BOSCH dishwasher E24 error message, you need to understand what it’s really trying to tell you.

What Does BOSCH Dishwasher E24 Error Code Means?

This error usually means there’s a drainage issue. It’s not always a major repair, sometimes it’s as simple as a clogged filter or a blocked hose. The E24 issue points to a problem in the drain system, where water isn’t draining properly or is flowing back into the dishwasher. If you’re seeing this message, something in your dishwasher’s drain path needs attention. Read on to see what’s most likely causing the E24 error and how to fix the issue quickly.

Common Reasons for BOSCH Dishwasher Error Code E24

Blocked filter

A clogged filter is the easiest and most overlooked problem. It sits at the bottom of the dishwasher, and if not cleaned regularly, food particles and grease can build up fast. When the filter is dirty, it slows down water flow and can lead to draining problems. To fix this, remove the filter and clean the filter under running water. Use a soft brush if needed. This small task can make a big difference and prevent future drainage problems that might require expensive repair.

Check the drain hose if clogged

If your BOSCH dishwasher is not draining, one place to check is the hose. A blocked drain hose can stop everything from draining properly. Locate the drain hose under your sink or behind the unit. Check for a clogged drain hose by feeling along its length for kinks or tight bends. You might need to disconnect the drain hose and flush it with water to clear a clog. If this doesn’t work, you may have to replace the hose entirely.

Check the drain pump for blockage

If water stays inside the dishwasher, the drain pump could be blocked. You’ll need to reach the drain pump by removing the lower panel or kickplate. Look for objects like broken glass or food chunks. Check that the impeller on the pump can spin freely. If it’s jammed, remove the pump and clean it out. It’s a good idea to periodically check this area, especially if you hear strange sounds during draining or if draining takes too long.

Air gap clogged

The air gap, if installed, sits next to your faucet. It’s meant to prevent backflow, but it can get clogged with food or grime. Twist off the top cap, and you may immediately see gunk inside. Use a brush or rinse it under hot water to remove the blockage. If water is coming out of the air gap and spilling onto the counter, that’s a clear sign of blockage. Cleaning it can help restore normal draining right away.

Garbage disposal plug not removed

If you’ve recently installed a garbage disposal and forgot to punch out the plug where the drain connects, water won’t go anywhere. This is a very common mistake. Disconnect the hose from the disposal and look inside the port. If there’s a plastic plug still in place, that’s what’s causing the E24 error. Knock it out with a screwdriver and hammer. Reconnect the hose and run a cycle. Your dishwasher should now drain without issues.

Improper hose installation

Improper hose routing can make water flow backward. If the hose isn’t looped high or connected to an air gap, dirty water can end up flowing back into the dishwasher. This setup is important for ensuring your dishwasher drains correctly. Check under your sink and look at how the hose is installed. It should rise above the drain connection before curving back down. Re-routing the hose may solve the problem instantly without needing to replace BOSCH dishwasher parts.

Check valve stuck closed

There’s a small valve in many BOSCH dishwashers designed to stop water from coming back into the unit. Over time, debris or mineral buildup can cause it to stick shut. This restricts drainage and confuses the system. To check the valve, you’ll need to locate it on the drain path and see if it moves. If not, clean it gently or replace it. Make sure water can move in only one direction out of the dishwasher.

Drainage line frozen (in colder climates)

This one applies if you’re in a colder part of Ottawa or have uninsulated pipes. A frozen drainage line will block water completely, causing the dishwasher to back up. Look under sinks or along basement walls for any exposed hose. Feel it with your hands, if it’s rock-hard and icy, that’s your problem. You can use a hair dryer to thaw it safely. Once melted, insulate the line to prevent this from happening again in winter.

Internal blockage in sump or drain path

Sometimes the clog is deeper inside the machine. If the sump area or internal drain path is blocked, even a clean hose won’t help. You’ll need to remove the bottom rack and spray arm to access the drain area. Look around the pump cover for trapped debris. Clear anything you find and wipe it clean. This is often where small bones, wrappers, or broken glass get stuck and are causing a blockage problems without being obvious at first glance.

Control board or sensor malfunction (rare)

If everything is clean and flowing, and the pump seems to be working, the issue may be electronic. The sensor that detects water supply levels could be misreading, or it could be sending bad signals. This is rare but does happen. Unless you’re trained, don’t open the control board. Call us for professional appliance repair service. Our expert can check sensors and the board safely, using proper tools and diagnostics to avoid damaging other components.

Simple Troubleshooting Tips for any Cause of the E24 Error

First, check and clean the filter by checking the pump cover. Look inside the sump area for food bits or glass. Next, inspect the pump. Accessing the drain pump will take some effort, but it’s worth it if the blockage is deep. Then inspect the drain hose if it’s kinked or blocked, that’s your problem. Also, check for blockages in the garbage disposal and air gap. If you recently installed a disposal, see if the plug was removed. Still having problems? Check the dishwasher’s manual for specific instructions.

When to Call a BOSCH Dishwasher Appliance Repair Technician

If the control board might be malfunctioning or if the drain pump is working but still not draining properly, it’s time to call for appliance service repair. Our technician can diagnose and resolve the E24 error code safely. Don’t risk damage or leaks from DIY errors. Call Doctor Appliance Repair Ottawa if your BOSCH dishwasher is displaying the E24 error. We’ll check for drainage problems, inspect the pump motor, and fix the issue professionally. Periodically check for clogs and clean the system to keep your dishwasher running without issues.