Troubleshoot error code “E24” in Bosch dishwasher

How to eliminate E24 error in Bosch dishwasher?

  • Error: E24
  • Description: The dishwasher is not draining properly due to a blocked drain filter. 
  • Cause: – The drain hose may be clogged. – The dishwasher filter may need to be cleaned. – The installer may have forgotten to remove the “knockout” plug on the new garbage disposal. – After fixing the problem, reset the dishwasher according to the owner’s manual.
  • Solution: Control the discharge pump and pipe.

Possible causes of error code E24

If your Bosch dishwasher displays the E24 error code, there are several possible reasons for this. Here are some things to check to identify the cause of the error code:

  1. Check the inlet hose and make sure it is not bent or damaged.
  2. Check the siphon connection and make sure it is properly sealed.
  3. The pump filter may be loose. Locate it under the filter and make sure it is securely tightened. Refer to the owner’s manual to find its location.

Now that we know the possible causes of the E24 error code, let’s see how to fix it.

Solution to error code E24

  1. Clean the filter Your Bosch dishwasher should have a filter, which is located at the bottom of the dishwasher. To locate the filter, remove the lower rack and the spray arm. Twist the top part of the filter to remove it from the dishwasher. If the filter cannot be easily removed, refer to the dishwasher manual for filter removal instructions. Take out the filter from the dishwasher and clean it with warm water and soap. While you have the filter out, check the drain pump.
  2. Check the drain pump If cleaning the filter did not solve the E24 error code, it is possible that the drain pump is clogged and causing the problem. It could also be that the pump cover is loose, which can also trigger the E24 error code.

In most Bosch dishwashers, the pump cover and pump can be checked and cleared of obstructions when the filter is removed. It is recommended to use protective gloves when checking the pump for obstructions, as the pump housing may contain sharp objects such as broken glass.

You can use a teaspoon to unhook the pump cover. With the cover removed, check for any obstructions and make sure the pump impeller can rotate freely. If the impeller has difficulty rotating, it indicates a faulty drain pump.

Depending on the model, it is also possible to check if the drain pump is working by lifting the float. The float is located near the filter. Depending on the model, if the drain pump is functioning correctly, the dishwasher should activate the drain pump when you lift the float. Make sure to keep your hands away from the drain pump area when lifting the float. If the E24 error code persists, move on to the next step.

If you cannot access the pump, proceed to step 6 to remove the bottom plate to access it.

  1. Check for bent hoses A bent hose can prevent the dishwasher from draining and cause the E24 error code. Before moving on to the next step, check that the drain hose is not bent. Note that if the drain hose is not connected to an air gap, it may be set up with a high loop to prevent residual water from flowing back into the dishwasher. The high loop is necessary to prevent other issues and is unlikely to be causing the E24 code problem.
  2. Clean the dishwasher If the dishwasher still does not drain, it is possible that the E24 error code can be resolved by running a cycle with a dishwasher cleaning solution. Bosch manufactures a dishwasher cleaner or other similar product that can be purchased and used. It is also possible to make a cleaning solution with white vinegar and use baking soda to clear any obstructions. Do not use a chlorine-based cleaning solution if the dishwasher interior has stainless steel components.

You can proceed to step 5 and disconnect the drain hose to check for obstructions before running a cleaning solution in the dishwasher.

To clean with vinegar and baking soda:

  1. Pour 1 cup of distilled white vinegar into a dishwasher-safe container.
  2. Place the container on the top rack of the dishwasher. Do not pour the vinegar directly into the dishwasher, as it will drain out when the dishwasher starts the cycle.
  3. Run a normal cycle without dishes or detergent in the dishwasher.
  4. Sprinkle 1 cup of baking soda in the dishwasher and run a short cycle with hot water.
  5. If the E24 error code is not resolved, move on to the next step.
  6. Check the air gap / garbage disposal / siphon The dishwasher drain hose should be connected to an air gap, garbage disposal, or siphon under the sink. If you disconnect the drain hose, you may find the obstruction that is causing the E24 error code. Cleaning the air gap, garbage disposal, or siphon may also resolve the problem.
  7. Check the drain hose and drain pump If the above solutions have not resolved the E24 error code, it is possible that the dishwasher drain hose is clogged at the point where it connects to the drain pump. There may also be an obstruction or defect in the drain pump. However, a faulty drain pump should display an E25 error code.

The hose can be removed from the dishwasher and thoroughly cleaned of any obstructions. Before accessing the drain pump and removing the drain hose, check for other issues indicating a faulty control board causing the E24 error code.

To access the drain hose and drain pump:

  1. For safety, disconnect the power to the dishwasher and shut off the water supply to the dishwasher.
  2. Remove the screws holding the bottom plate on the bottom front of the dishwasher.
  3. If necessary, disconnect the wire harness.
  4. Check the drain pump:
  5. The drain pump may stop draining the dishwasher if something is obstructing it or if the pump motor is faulty. Check for obstructions in the pump and make sure the impeller rotates freely. If the pump impeller does not rotate freely, the drain pump likely needs to be replaced. The drain pump can be tested with a multimeter using the ohm setting or by removing it from the dishwasher and then testing it for continuity. If the motor does not show continuity, it will need to be replaced.
  6. Check the drain hose:
  7. Locate the drain hose, which should be connected to the drain pump. Most models will also have a recirculation hose that can also be checked for obstructions.
  8. Place a towel or container under the hose to catch any water that may spill.
  9. Disconnect the drain hose from the drain pump by removing the wire clamp with pliers. Check if you can clear the obstruction, you can use a drain snake.
  10. If necessary, disconnect the drain hose under the sink.
  11. Clean the drain hose with hot water to dissolve soap buildup and/or use a drain snake or drain cleaning tool.
  12. Reattach the drain hose to the dishwasher.

Hopefully, the E24 error code problem has been resolved. If the error persists, it is possible that the control board is faulty. Contact a trained professional to resolve the issue.

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