The situation when your favorite dishwasher Bosch ceases to cope with its main function, causing confusion and irritation. You load the appliances, select a program, but at the end you get plates with dried-on food residues or stains. This does not always mean that the equipment requires expensive repairs at a service center. Often the problem lies in banal violations of operating rules or blockages that can be easily eliminated on your own.
Equipment owners Bosch They value it for its reliability and German quality, but even the most advanced mechanisms are sensitive to the quality of water, the type of detergents and regularity of maintenance. If the unit hums, takes in water, but the quality of washing leaves much to be desired, it is necessary to diagnose the main components. In this article we will look in detail at why a Bosch dishwasher does not wash dishes and how to restore it to its former efficiency.
Before you panic, it is worth analyzing the nature of the pollution. If there is grease or residue left on the dishes, the reasons may be different: from clogged nozzles to a malfunction of the heating element. Understanding the specifics of the problem will help you save time and money by avoiding calling a specialist where you can handle it yourself in 15 minutes.
Clogged filter system and drain pump
The most common reason why a dishwasher Bosch Doesn't wash dishes well and is due to dirty filters. At the bottom of the washing chamber there is a filtration system consisting of a flat and cylindrical filter. Their task is to trap large food particles so that they do not fall into the circulation pump and splash back onto clean dishes.
When the mesh becomes clogged with grease and food debris, water circulation is disrupted. It becomes more difficult for the pump to pump water through a dense layer of dirt, the pressure in the system drops, and the jets from the sprinklers become weak. As a result, the water simply washes the plates without removing dirt. Regular cleaning of this unit is a basic requirement of the instructions.
⚠️ Attention: Never ignore filter indicators if they appear on the control panel. Operating the machine with a clogged filter can lead to overheating of the circulation pump and its expensive replacement.
To fix the problem, you need to remove the filters, wash them with warm water using a brush and a degreaser. It is also worth checking the drain hose and the connection to the sewer. If draining is difficult, dirty water may remain in the tank, mixing with clean rinse water.
☑️ Cleaning the Bosch filter
Water spray system malfunctions
Rocker arms (sprinklers) are the heart of the washing process. They ensure the supply of water under pressure to the dishes from all sides. If your Bosch dishwasher stops cleaning properly, first inspect the upper and lower spray arms. They should rotate freely with a slight push of the hand.
Often the holes in the rocker arms become clogged with scale or small lemon seeds that have slipped through the filter. In this case, the water cannot come out with the required force, and the pressure drops. It is also worth checking whether tall glasses or a poorly placed pan are blocking the rotation of the rocker arms.
- 🚿 Visual inspection: Remove the rocker arms and look at the light - all holes should be clean and transparent.
- 🔄 Rotation check: Reinstall the rocker arms and turn them. They must make several revolutions by inertia.
- 🧼 Cleaning: Use a toothpick or thin wire to remove limescale from the injectors.
If there are no mechanical obstacles, but the water supply is weak, the problem may be in the circulation pump. However, before sinning with electronics, make sure that you have chosen the right detergent and water softening salt, since scale is formed precisely because of hard water.
How often should sprinklers be cleaned?
It is recommended to remove and wash the rocker arms once every 1-2 months, especially if you often wash dishes with burnt-on food residue or use very hard water.
Problems with water heating and heating elements
High-quality dishwashing is impossible without hot water. Animal fats melt and emulsify at temperatures above 50-60°C. If your dishwasher Bosch washes with cold or lukewarm water, grease will settle on the walls of the chamber and devices, creating a film.
The main heating element is a heating element (tubular electric heater). Over time, a thick layer of scale forms on its surface, which acts as a heat insulator. The water heats up slowly, and the temperature sensor may give incorrect readings, turning off the heating ahead of time. In the worst case, the heating element simply burns out.
You can check the water temperature by opening the machine door halfway through the wash cycle (be careful, steam may escape). If the water is cold and the program involves heating, it is necessary to diagnose the heating element and temperature sensor. The cause may also be a faulty control board that does not supply voltage to the heater.
| Symptom | Possible reason | Solution method |
|---|---|---|
| Dishes feel greasy to the touch | Low water temperature | Checking the heating element and thermostat |
| White coating on glass | Not enough salt or settings are messed up | Add salt, adjust hardness |
| Stains and iridescent film | Excess rinse aid | Reduce rinse aid dispenser |
| Leftover food in corners | Weak water pressure | Cleaning filters and rocker arms |
Incorrect loading and selection of detergents
Even working equipment will not be able to wash the dishes if the hydrodynamics inside the chamber are disrupted. Incorrect placement of plates is a common mistake made by users. If the cups are placed upside down at an angle, they will collect water that will not flow out. As a result, dirt and detergent remain inside the glass.
In addition, large items such as baking sheets or cutting boards should not block the spray arms. Water should circulate freely throughout the entire volume of the chamber. If you place a tall pan directly above the lower rack, the upper basket will remain virtually dry.
The second important aspect is chemistry. The use of conventional dishwashing gels is strictly prohibited, as they form abundant foam, which can damage electronics. For dishwashers Bosch use special tablets, gels or powders. It is also important to monitor the level of salt in the reservoir and rinse aid in the dispenser.
⚠️ Attention: Never pour salt into the detergent compartment or pour a tablet directly into the bottom of the chamber without a container. This will cause corrosion of the stainless steel and failure of the ion exchanger.
If the water in your area is very hard, adjust the water hardness control according to the instructions. This is located in the settings menu (usually you need to hold down a certain button when turning it on). Incorrect settings will lead to either scale or excessive salt consumption.
Use All in 1 tablets only if you have soft water. For medium and high hardness, be sure to add salt separately, even if the packaging of the tablets says otherwise - this will extend the life of the heat exchanger.
Malfunctions of electronics and sensors
Modern dishwashers Bosch equipped with a sophisticated diagnostic system. If the machine turns on but does not start washing or interrupts the cycle, the protection may have tripped. Leak sensor AquaStop could be activated due to a micro-leak in the pan, even if there is no water on the floor.
Problems may also be related to the water turbidity sensor. If it is dirty or faulty, the machine may “think” the water is clean and reduce the cycle time, or, conversely, endlessly rinse the dishes. Failures in the control module are less common, but are possible during power surges in the network.
For diagnostics, resetting the program often helps. Try unplugging the machine for 15-20 minutes. If after switching on the error repeats, and simple methods (cleaning filters, checking hoses) did not help, you will need to call a specialist with a tester.
- 💡 Error codes: Pay attention to the flashing indicators. Combinations of blinking (for example, the salt and rinse aid indicator is blinking) are interpreted in the instructions as specific error codes (E01, E09, etc.).
- 🔌 Reboot: A complete power reset helps eliminate controller software glitches.
- 🔧 Sensors: Check the float in the pan (located under the car), it should not be jammed.
If the machine shows an error and does not start washing, in 80% of cases the problem is solved by cleaning the filters or rebooting the system, and only in 20% of cases replacement of parts is required.
Water Quality Impact and Prevention
The quality of tap water directly affects the durability of the dishwasher and the quality of washing. A high content of chlorine, rust or hardness salts quickly damages internal components. To protect equipment Bosch It is recommended to use polyphosphate filters at the inlet or connect the machine to a reverse osmosis system (if the model allows it).
Regular maintenance prolongs the life of the unit. Once a month, run a high temperature wash cycle (90°C) with a special dishwasher cleaner or citric acid. This will dissolve fatty deposits in hidden tubes and remove odor.
Remember to wipe the rubber door seal with a damp cloth. Dirt accumulates on it, which can become a source of unpleasant odor and cause the door to not fit tightly, which leads to a loss of pressure inside the chamber during washing.
Why does my dishwasher leave a white residue on my dishes?
White deposits most often indicate a lack of salt to soften the water or that the rinse aid has run out. The reason may also be the use of low quality powder or too high a water temperature, due to which some components of the product are not completely washed off. Check the water hardness settings in the machine menu.
Can a Bosch dishwasher be washed with a regular Fairy?
Absolutely not! Conventional dishwashing detergents create a huge amount of foam. Foam can penetrate electronic components, causing a short circuit and causing machine failure. In addition, foam reduces the effectiveness of the mechanical impact of water jets on dishes. Use only specialized products marked “dishwasher safe”.
What to do if there is water left in the glasses after washing?
This is a sign that the dishes were placed incorrectly (horizontally or tilted inward). Water should flow freely. Turn the glasses upside down or at a downward angle. Also check that the filter is not clogged, as poor drainage can leave water at the bottom of the chamber, which then flows into the appliances.
How often do you need to change filters in a Bosch dishwasher?
Mesh filters are reusable and do not require regular replacement if washed carefully. However, if the mesh is deformed, torn, or the metal fabric is damaged, the filter must be replaced. Plastic elements may crack over time. Visually inspect them every six months. With normal use they last for years.
Why does the machine hum but no water sprays?
A hum in the absence of splashing indicates that the circulation pump is working, but water is not flowing into the rocker arms. Reasons: the coarse filter is heavily clogged, the inlet hose is pinched, the water supply tap is closed, or the pump itself is faulty (impeller wear). Start checking with the filter and water supply tap.