The dishwasher does not drain water: causes and their elimination

When your dishwasher refuses to empty the water, it can make a simple cleanup difficult and frustrating. The first step in resolving this problem is to comprehend its common causes. The culprits are frequently issues like clogs, defective components, or even straightforward user error. Early detection of these problems can help you avoid more extensive repairs and save time.

We’ll go over the common causes of your dishwasher’s draining difficulties in this guide. In order to help you resolve these problems and get your dishwasher operating properly again, we’ll also offer helpful advice. Whether the issue is a broken pump or a clogged filter, we’ll assist you in diagnosing and fixing it.

How does a dishwasher work

Dishwashers (henceforth referred to as dishwashers, PMMs) work on a similar principle to washing machines; the only difference is in the way the liquid moves. The picture amply illustrates how water flows through the PMM during dishwashing.

A dishwasher’s peculiarity is that it uses the same water multiple times while it is in use.

Following its initial use, the liquid is run through coarse and fine filters before continuing on to the dishwashing and rinsing stages. This cycle is repeated twice in normal mode, which results in significant water savings. After the task is completed, the drain system removes the soiled liquid.

Reasons why water does not drain

In the event that there are no warning signs and the dishwasher is not draining the water, the issue could be a drainage system component failing or a blockage keeping the liquid from entering the sewer.

The following could be the issue:

1. Drain filters are filled with food debris and other debris.
2. The drain pipe into which dirty water is drained is clogged.
3. The drain hose is pinched or clogged.
4. There is a blockage in the drain pump (pump) or it is faulty.
5. The water level sensor (pressure switch) has stopped giving correct information.
6. The software control module has failed.

As you can see, there may be many reasons why water does not drain from a Bosch dishwasher or equipment of another brand. In order to fix the problem, you need to start by identifying blockages in the system.

If obstructions are not discovered, the defective component must be located and either repaired or replaced.

Improper draining of your dishwasher can result in standing water and have an impact on its functionality. This problem is frequently caused by clogged filters, obstructed hoses, or broken pumps. Knowing these possible issues and how to fix them will enable you to take immediate action to resolve the problem and increase the efficiency of your dishwasher.

Removing blockages

Debris and food particles that have gotten into the drain are the main causes of a Bosch dishwasher not draining water. Always clean dishes to remove any food residue before putting them in the dishwasher. By doing this, debris won’t accumulate in drainage filters too quickly. Clean the filters in your dishwasher at least once a week if you use it every day.

Verify that food particles and debris have not entered the pump when inspecting the filters. Try the following to verify this:

• empty the chamber from all baskets;
• unscrew the filter cover at the bottom and remove it;
• wash the filter element using a soft brush and detergent;
• unscrew the pump cover, which should be in the same place, under the filter;
• carefully examine the space under the cover and the impeller, and if debris is found, remove it.

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Check the spray nozzles in addition to the filter and pump; if they are clogged with debris, the rocker arms won’t be able to rotate and wash the dishes efficiently.

Regarding the contents of the dishwasher When the pump impeller is not rotating properly or the Bosch filter becomes clogged, error codes E22 or F22 appear on the display.

Problem with the sewerage system

The dishwasher frequently overflows its water tank because of a blockage in the sewage system. In the event that the dishwasher appears clear of debris but the liquid does not have enough time to exit the chamber while in drain mode, take the following actions:

1. Disconnect the drain hose from the sewer. If water flows out of it, there is probably debris in the pipe.
2. If the blockage is minor, pour boiling water into the sewer hole.
3. For more effective cleaning, mix table salt and soda in equal proportions. Load the mixture into the sewer hole and pour hot water there. After 20-30 minutes, flush the system with running water. You can use the "Mole" product and other household chemicals intended for these purposes.
4. If all attempts are ineffective, call a specialist who will clean the sewer with a flexible steel cable.

Even the thickest sewer blockage can be cleared with the aid of a specialized cable (call a specialist if you don’t think you can handle it yourself).

Cut the drain hose

Such an issue is extremely uncommon, but it is not impossible. The Bosch PMM display indicates this malfunction with error codes E24, E25, or F24, F25. First, confirm that the hose is in the proper place, is not clamped by anything else, and is excess-free.

You can "massage" him by using your hands to finger the entire length without taking the hose off. Once it has been disconnected from the sewer and is draining into an empty bucket, you should then verify if water flows from it.

Disconnect the hose from the PMM if these steps were ineffective. The trash should be removed if you then shoot a powerful stream of water into it. If something goes wrong, you can still buy a replacement hose from the same retailer where you bought the dishwasher.

Identification of faulty details, their repair and replacement

In the event that the dishwasher is not draining water and there are no obstructions, you will need to search for a broken component. First things first, focus on the pump.

Checking and replacing the pump

The dishwasher’s bottom produces a distinctive sound that is produced by the pump when it is draining. The pump is not functioning if there is silence during the last phase of operation and the drain does not begin to run.

Bosch and Siemens dishwasher circulation pump along with the mounting clamp

If such a breakdown is found, take the following steps:

1. Remove water from the dishwasher chamber in any convenient way – with a sponge or by tilting the machine forward.
2. Remove the filter element from the seat.
3. Place the device on the back panel and, having unscrewed the screws, remove the tray. Be careful – there may be a leak protection sensor on the tray. If there is one, disconnect it from the cable.
4. Remove the pump – disconnect the cable connectors from it, loosen and remove the clamp, then disconnect the part from the distribution mechanism, from the ion exchanger with salt and the movable support (see. video below).
5. Measure the resistance of the pump winding with a multimeter. Its value should be within 200 Ohms. Check the integrity of the cables coming from the control unit and make sure that voltage is supplied to the pump. If there is voltage, but there is an open or short circuit in the winding, replace the pump.
6. Check how the impeller rotates. If there is no intermittent movement, the pump is faulty and will have to be replaced.
7. Assemble in the reverse order.

Readers will be able to replace a Bosch dishwasher’s circulation pump correctly after watching this video:

Problems in the operation of the pressure switch and control board

The dishwasher may not drain water if these components are the cause. The dishwasher’s brain is the control unit. The unit’s operation is interfered with if there is a memory failure, contact failure, or failure of one of its parts.

The dishwasher cannot empty the water when the pressure switch provides the control unit with false information about the water level (since there is no water, there is nothing to drain). It is best to contact a service center for such breakdowns because diagnosing parts and fixing them require a certain level of qualification.

As you can see, the majority of water drainage-related issues only appear to be serious. Owners with the most basic skills can get rid of them on their own. We hope that our post will assist you in promptly getting the equipment back up and running.

In order to prevent more problems, it’s critical to fix your dishwasher’s improper water draining system as soon as possible. When troubleshooting, the first things to do are usually to check and clean the drain filter and hose. The issue is frequently resolved by making sure the hose is free of kinks and obstructions.

The source of the drainage problem can also be found by checking the garbage disposal unit for clogs and making sure the drain pump is operating properly. To ensure a thorough diagnosis and repair, it might be necessary to speak with a qualified technician if these steps don’t solve the issue.

You can preserve your dishwasher’s effectiveness and make sure it keeps working smoothly by being proactive and taking care of these possible problems, keeping your kitchen tidy and hassle-free.

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