Residue of liquid at the bottom of the dishwasher Bosch after the cycle is completed or a sudden stop of the program with a flashing of the drain indicator indicates a blockage or malfunction of the pump. In this situation, the technique blocks the launch of new modes to prevent flooding of the kitchen, requiring immediate user intervention to remove the accumulated moisture. Ignoring this condition can lead to the appearance of an unpleasant smell, the reproduction of bacteria and corrosion of internal structural elements.
The primary task of the owner is to safely extract the water without damaging the electronic modules and seals. The procedure requires care, as the water can be hot and contain residues of detergents. Before starting any manipulations, it is necessary to completely de-energize the device by pulling the plug from the socket, and to block the water supply faucet, if the design allows it.
Causes of water stagnation in the drain system
The most common reason for the impossibility of regular drainage is the blocking of the filter element with large food particles, bones or scale. System system filtering dishwasher Bosch It is designed so that even a small obstacle in the grid can completely stop the work. drain-pump. Mechanical damage to the impeller pump is also common if the tank got shards of glass or toothpicks.
⚠️ Warning: Before starting work, be sure to turn off the power supply of the device. Working with water and electricity simultaneously creates a risk of electric shock.
Another factor preventing normal fluid flow may be overburden or clogged. drain-hose. If the device is connected incorrectly or the hose is transmitted by furniture, the water will not physically be able to leave the tank. Sometimes the problem lies in the siphon of the kitchen sink, where the dishwasher drain is cut: if it is clogged, the liquid will return back to the chamber.
Technical nuances of the water gate
The Aquastop system in Bosch models often has a double hose wall. If there is a rupture of the inner tube, the outer shell can swell and block the current of water inside the hose itself, which will require its complete replacement.
Preparation for manual liquid removal
To carry out the pumping procedure, you will need a minimum set of tools and consumables, which are usually available in every house. You will need flat containers with low sides to substitute them under a hose or filter, as well as absorbent rags or sponges to collect residual moisture. It will not be superfluous to prepare a flashlight, since the lighting inside the dishwasher chamber with power cut off will be absent.
The process begins with the complete release of the lower basket from the dishes. This will give access to the bottom of the chamber, where the main nodes of the drain system are located. If the chamber has hot water, let it cool down a little to avoid burns before proceeding with active action to extract it.
Use rubber gloves when working with dishwasher water, as it contains chemical residues of detergents and fat that can irritate the skin.
Drainage hose method
The most effective way to quickly remove the main volume of water is the use of a regular drainage hose. For this, the dishwasher. Bosch You need to carefully move away from the wall, providing access to the back panel. Find the connection of the drain hose with the sewer pipe or siphon of the sink and disconnect it, pre-substituting a bucket or pelvis.
If the hose is connected high, the water may not flow out of the water due to the design features. In this case, the hose should be lowered below the level of the bottom of the dishwasher chamber. You can use the U-shaped bend of the hose as a siphon, but to drain its end must be kept as low as possible.
1. Prepare a wide capacity of at least 10 liters.
2. Disconnect the drain hose from the sewer.
3. Lower the free end of the hose into the prepared bucket.
4. If necessary, blow the hose or use the principle of communicating vessels to start the flow of water.
Often, the water stagnates precisely in the bend of the hose, forming an air plug. A slight tap on the hose or straightening it can help gravity do its job. If the squamous flow does not work, you can gently pour some water into the hose from the side of the machine to create pressure and push the plug.
Pumping water through the filter compartment
When access to the back panel is limited or the hose cannot be removed, water must be removed directly from the chamber through the filter assembly. This method is more time-consuming and requires patience, since the volume of the liquid selected is limited by the size of the bucket or sponge. First, you need to dismantle the bottom basket and remove the filters.
Filtration system Bosch It usually consists of two or three parts: a flat mesh filter, a cylindrical microfilter, and sometimes an additional valve. All these elements must be twisted counterclockwise and set aside. The opening hole leads directly to the impeller of the drain pump.
☑️ Algorithm of actions during draining through the filter
To extract water, use a small bucket, plastic cup or syringe pear (enema), which is ideal for collecting fluid from the recesses. Act carefully so as not to damage the plastic elements or the heating element (TEH) located on the bottom. After removing the bulk of the water, thoroughly wipe the bottom with dry rags.
Diagnostics and cleaning of the drain pump
After the water is removed, access is opened for visual inspection. pump-pump. In the hole where the filter stood, you need to light a flashlight and check the condition of the impeller. It must rotate freely and have no foreign objects in the blades.
Often small objects fall into the pump: peach bones, bottle plugs, coins or toothpicks. These foreign bodies can jam the motor, which causes it to hum, but does not pump water. To check the rotation of the impeller, you can gently press it with your finger or a thin screwdriver (when the power is turned off!).
| Fault sign | Probable cause | Remediation method |
| :--- | :--- | :--- |
| The wing does not rotate | Mechanical blockage | Remove a foreign object with tweezers |
| Hum heard but no water | Shaft jamming | Check the freedom of the blades |
| The wing hangs | The bush break | The replacement of the drain pump |
| Water goes slowly | Partial blockage of hose | Blow hose or wash under pressure |
⚠️ Warning: Never try to check the pump operation by turning on a machine with or without open filter. This will lead to the combustion of the mechanical seal and the failure of the node.
If the pump is visually clean but the water does not go away when the test mode is started, there may be a problem with the electronics or winding of the engine. In this case, a multimeter vertebra is required, which is a task for a qualified specialist.
Checking the sewer system and siphon
Remember that the problem may be outside the dishwasher itself. If the drain hose is cut into the siphon of the kitchen sink, then the clog can be there. Water from the sink can escape slowly, which will confirm the hypothesis of a problem in the general sewerage.
It is necessary to disconnect the dishwasher hose from the siphon and check the patency of both holes. Often, a fat plug accumulates at the insert site, which blocks the flow of water from the machine, although it can leave the sink along the bottom of the pipe. Cleaning with a brush or the use of special chemicals will help restore patency.
The main conclusion: 90% of the problems with draining in Bosch dishwashers are solved by cleaning filters and checking the drain hose for inflections.
Preventing recurrence of the problem
In order to ensure that the situation where drain manually, not repeated regularly, you should adhere to simple rules of operation. First of all, it is a thorough cleaning of dishes from the residues of food before loading. Modern enzymes are effective, but they are not designed to process large pieces of food.
Regular maintenance of the filter system is the key to long-term operation of the equipment. Once a week, it is recommended to wash the filters under running water using a brush, removing fatty plaque. It is also useful to start a self-cleaning regimen once a month using special tablets or citric acid to remove scale and fat from internal highways.
What if the car doesn’t work after the drain?
If the water is removed, the filters are clean, but the dishwasher is clean. Bosch does not start or gives a drain error (often flashing a faucet indicator or drop), perhaps the drain pump itself or the control module has failed. It is also worth checking the integrity of the wires going to the pump. In difficult cases, professional diagnosis is required.
Can I use a vacuum cleaner to pump water?
Use a regular household vacuum cleaner for pumping water is strictly prohibited - this will lead to its breakdown and electric shock. There are special water vacuum cleaners, but in everyday life it is safer and easier to use a syringe pear or sponge.
How do I know if the back valve has broken?
If after draining the water again is dialed into the machine by itself or flows from the sewer when the device is turned off, then the return valve in the drain system is defective or there is no air gap in the connection of the hose.