Why did the dishwasher become bad at washing dishes?

The dishwasher began to leave greasy residue or dried-on food residue on the plates immediately after the end of the standard wash cycle, which indicates a decrease in the efficiency of the main components. If Bosch or Electrolux have ceased to cope with contaminants that were previously removed without problems, the first step is to eliminate clogging of the filter system and disruption of water circulation. Ignoring primary symptoms often leads to complete failure of the circulation pump or heating element, requiring expensive repairs.

A decrease in the quality of washing can be caused by a simple lack of regenerating salt or the use of an inappropriate detergent that does not dissolve at the current water hardness. Sometimes the problem lies in improper loading of the basket, when large objects block the jets from reaching other areas of the chamber. Understanding the physical principles of how a machine works helps you quickly locate a fault without calling a technician.

Clogged filtration system and drainh2>

The most common reason that equipment has stopped washing away contaminants is critical contamination of the bottom filter, through which all the water passes in the cycle. Small food particles, bones and fat accumulate in the mesh, creating a barrier to the free flow of fluid to the pump. As a result, the pressure in the system drops and the sprinklers rotate sluggishly or stop completely.

Regular cleaning of the filter assembly is a basic procedure that the user should perform weekly. If this rule is neglected, the greasy deposit hardens and clogs the small cells, making rinsing with water impossible. In such cases, even powerful jets cannot penetrate the layer of dirt.

• 🧼 Remove the lower basket and unscrew the central cylindrical filter counterclockwise.
• 💧 Rinse the mesh under strong pressure of hot water using a brush with stiff bristles.
• 🔍 Inspect the flat mesh filter at the bottom of the washing chamber for large food debris.
• 🚿 Check the drain pump hole for any stones or glass that might have gotten in there.

⚠️ Attention: Never run your dishwasher without the filter installed, as this can cause debris to get into the pump and cause it to jam.

Problems with sprinklers and water pressureh2>

Water baskets located at the bottom and top of the chamber are a key element in the mechanical cleaning of dishes. If the dishwasher begins to clean poorly, inspect the holes in the rocker blades: they are often clogged with scale or small debris that has passed through the filter. Blockage of even one hole disrupts the balance and reduces the intensity of water flow.

In addition, the sprinklers themselves can become jammed due to an incorrectly placed plate or cutlery. Make sure that nothing prevents the rocker arms from turning freely by hand. If the rotation is difficult, the machine will not be able to wash all surfaces and dirt will remain on the dishes.

How to properly clean sprinkler holes

To clean, use a thin toothpick or needle, carefully removing limescale from each hole. Do not use metal objects that could expand the bore size and disrupt the hydraulics.

The water pressure in the system also depends on the condition of the inlet valve and supply hose. If the pressure in the water supply has dropped or the filter mesh at the entrance to the machine is clogged with rust, the volume of water drawn will be insufficient for effective washing.

• 🔄 Remove the upper and lower sprinkler arms, checking them for cracks or chips.
• 🌊 Rinse the internal channels of the rocker arms under running water, shaking out any accumulated debris.
• 🔩 Check the attachment of the sprinklers, making sure they are securely fixed.

Lack of salt and quality of detergentsh2>

Hard water is the main enemy of any dishwasher, causing scale formation on the heating element and internal parts. If you do not use special salt or forget to add it to the tank on time, the ion exchanger stops softening the water. As a result, the detergent does not foam well and does not react with fat, leaving streaks and a white residue.

📊 Which product do you use most often?

All in one tablets

Gel or powder

Combination of salt and rinse aid

Folk remedies

Modern “3 in 1” or “5 in 1” tablets often do not cope with very hard water without the additional use of salt. The concentration of emollients in them may not be sufficient for your region. In this case, you need to adjust the water hardness in the electronic control unit or switch to using a separate gel and salt.

Symptom	Probable Cause	Solution
White coating on glass	Too much salt or too soft water	Reduce salt supply in settings
Oily film	Lack of salt or low temperature	Add salt, select heating mode
Remaining powder	Dispenser malfunction or short program	Check the dispenser lid mechanism
Rainbow stains	Excess rinse aid	Reduce rinse aid dose

Incorrect boot and mode selectionh2>

Often the reason for poor washing is trivial - violation of the rules for loading dishes. If the plates are placed too tightly or block the path of rotation of the rocker arms, the water simply does not reach some areas. Large items such as pots or pans should be placed around the edges of the lower basket, without blocking the center.

☑️ Checking the loading of dishes

Rocker arms rotate freelyNozzle holes are not closedThe dishes do not block the dispenserThe dirty side looks at the flow of water

Done: 0 / 4

The choice of program also plays a critical role. Short “Quick Wash” or “Eco” cycles are ineffective for heavy soiling because the water does not have time to heat up to the required temperature or the soaking cycle is too short. For burnt food and dried fat, pre-soaking and heating to 70°C are required.

⚠️ Attention: Always place plastic dishes in the upper basket, as in the lower basket they can be deformed by the heater and block the flow of water.

Technical faults and component wearh2>

If simple methods do not help, there may be a technical failure. When the circulation pump wears out, the water pressure drops and the jets become too weak to remove dirt. Also, the heating element (heating element) often fails, which is why the water remains cold and the chemical purification processes are not activated.

Diagnostics of heating element

To check the heater you will need a multimeter. It is necessary to ring the contacts of the heating element for resistance. If the device shows a break or resistance close to infinity, the element must be replaced. Don't forget to turn off the power supply before diagnosing!

Electronics problems, such as control module failures, can result in incorrect cycle timing or failure of the pump to turn on. In such cases, the machine may hum, but not pump water, or complete the cycle in 10 minutes instead of the required two hours.

• ⚙️ The circulation pump may hum or make a grinding noise when the bearing is jammed.
• 🌡️ A faulty temperature sensor may give false signals about water heating.
• 🔌 Oxidation of contacts on the heater often causes intermittent operation.

Prevention and care of the dishwasherh2>

In order for the equipment to serve for a long time and wash dishes efficiently, it is necessary to carry out regular preventive maintenance. Once a month, it is recommended to run the empty machine at maximum temperature using a special cleaner or citric acid. This will help dissolve grease deposits in hidden pipes and disinfect the system.

💡

Check the rubber seals on the door every six months. If they are dry or damaged, the machine will lose heat and water, which will affect the quality of the wash.

It is also important to monitor the condition of the drain hose. If it is badly bent or clogged where it connects to the drain, dirty water may remain in the machine or back up, staining clean dishes during rinsing.

The most critical mistake is ignoring the salt shortage indicator, which in hard water is guaranteed to lead to machine breakdown in 1-2 years.

💡

High-quality washing depends on a complex condition: clean filters, the presence of salt, proper heating and correct loading.

Frequently asked questions (FAQ)