Modern dishwashers Bosch Deservedly considered the standard of reliability in the segment of household appliances, but even German engineering is not immune from wear and tear or sudden failures in operation. When the unit stops collecting water, does not heat it or simply refuses to start the wash cycle, the owner has a choice: call the master or try to fix the malfunction on their own. Statistics of service centers show that more than 60% of breakdowns can be eliminated without specialized equipment and deep knowledge of electronics, if you act consistently.
Before starting the disassembly, it is necessary to clearly understand that self-diagnosis This is the first and most important stage. Many users ignore the flashing lights or beeps that the machine itself is giving in an attempt to communicate the nature of the problem. In this article, we will analyze the main nodes of the device, fault detection algorithms and methods for their elimination, based on technical documentation and the experience of professional repairmen.
It is worth noting that self-intervention deprives you of a guarantee if its validity has not expired yet. However, for devices that have served several years, literate hand-craft This saves a significant amount of money, as the cost of calling a master and spare parts is often more than half the price of a new appliance. The main thing is to observe safety and not to force events.
⚠️ Warning: Before starting any diagnostic or repair work, be sure to disconnect the dishwasher from the electrical grid and cut off the water supply. Working with electrical appliances under tension is deadly!
Decoding error codes and primary diagnosis
Dishwashers Bosch equipped with a developed self-diagnostics system that displays information about malfunctions on the display in the form of alphanumeric codes or combinations of flashing indicators. Understanding these signals allows you to immediately narrow the search for a problem. For example, code E15 or E14 Most often indicates leakage and operation of the system AquaStop. . . whereas E09 It signals problems with water heating.
An error does not always mean a failure of a particular node. Sometimes the failure occurs due to a power surge in the network or software freeze controller. In such cases, a complete resetting of settings helps. To do this, you need to press the power button (or the program selection button, depending on the model) for 3-5 seconds until the signal sounds, after which the machine should be turned off from the socket for 15-20 minutes.
Hidden error codes
Some Bosch models have service codes that don’t appear on a regular display, but can be read through a special diagnostic mode activated by a specific sequence of button presses when turned on.
If the error returns after the reboot, then the problem is physical. It is important not to ignore repeating codes, as operating a technique with a faulty water level or temperature sensor can cause more expensive components such as an electronic module or motor to fail.
- 🔍 E01-E09 Errors related to water temperature and the operation of the heating element.
- 💧 E10-E19 Problems with water supply, pressure and leakage protection system.
- 🌀 E20-E29 - malfunction of the circulating pump, drain pump or flow sensors.
- ⚡ E30-E39 Failures in the operation of the electronic control module or wiring.
Problems with water collection and AquaStop system
If the dishwasher Bosch It buzzes, but the water does not gain, or, conversely, it gains too slowly, first of all, you should check the pressure in the water supply network. However, most often the cause lies in contamination of the inlet filter or malfunction. inlet-valve. The filter is a small mesh located at the place where the hose is connected to the machine, which traps rust and sand.
System system AquaStop It is a key element of security. It consists of a double hose and a special module with a solenoid valve at the end. If water is detected inside the pallet, the float sensor rises and mechanically or electrically shuts off the water supply. The operation of this system is often accompanied by an error code. E15 And the endless operation of the drain pump.
When cleaning the inlet filter, use a toothbrush and a weak citric acid solution to remove lime plaque that can clog the mesh cells.
To diagnose the valve, it is necessary to ring its coil with a multimeter. The normal resistance of the coil is usually from 2 to 4 k Ohm. If the device shows a break or short circuit, the valve must be replaced. It is also worth checking the integrity of the wires going from the control module to the valve, since in conditions of high humidity, the contacts can oxidize.
| Symptoms. | Probable cause | Method of verification |
|---|---|---|
| The car is humming, there's no water. | Faucet closed or no pressure | Check the pressure in the tap. |
| It's getting water all the time. | Intake valve valve valve | Call the valve coil. |
| Leakage indicator on. | AquaStop worked. | Check the pallet for water. |
| The water flows in a thin stream. | Clogged inlet filter | Clean the filter mesh |
Failures in water heating and TENS
Lack of hot water is one of the most common reasons a dishwasher is Bosch leaves on the dishes a greasy plaque or detergent in a powder receiver. Heating the water is responsible TAEN (tubular electric heater), which can fail due to the formation of scale or a surge in voltage. In modern models, the TEN is often integrated into the bottom of the washing chamber or is a flow heater.
Diagnosis begins with checking the integrity of the heating element. To do this, the TENG must be “ringed” by a multimeter in the resistance measurement mode. The working value is usually in the range of 20-40 ohms. If the device shows one (infinity), then the nichrome spiral has burned out. It is also important to check the absence of a breakdown on the housing by measuring the resistance between the contact of the TENS and its metal tube.
⚠️ Warning: Before checking the TENS, make sure that it is not supplied with voltage. Even after the machine is turned off, the residual charge can be retained in the capacitors of the control module.
Often, together with the TEN, a temperature sensor (thermostat) fails. If it shows the controller incorrect data (for example, that the water is already hot, although it is cold), the heating will not turn on. In some models Bosch The temperature sensor is built directly into the TEN, and they have to be changed in the assembly. It's crucial When ordering parts: Check the sensor’s compatibility with your specific heater modification.
- 🌡️ Scale. - the main enemy of the TEN, creating an insulating layer and causing overheating.
- 🔌 Contacts - often oxidized or burned at the point of connection of wires to the TEN.
- 🧠 Module If the TEN and sensor are working, the problem may be in the control simistor on the board.
Drain system and circulation pump
If after the cycle ends, there is water at the bottom of the chamber or the machine cannot drain the waste liquid at all, the problem lies in the drain system. The main elements here are a drain hose, a rough cleaning filter and a drain pump (pump). Clogging any of these elements disrupts the hydraulics of the process.
The first thing to do is to check and clean the filters at the bottom of the washing chamber. Food residues, bones and fat can clog the cells tightly, preventing the flow of water. If the filters are clean, the drain hose should be inspected for bending and blockages. Often, a fat plug is formed at the connection of the hose with the sewer siphon.
☑️ Diagnostics of the drainage system
Drain pump in cars Bosch It is usually a compact block with a plastic case. If you hear a buzzing sound when you turn on the drain, but the water does not go away, the impeller may have jammed. Try to gently twist it with your finger (pre-dumping the water). If the pump is silent and does not make any sounds, most likely the engine winding has burned or contact is broken.
Special attention deserves a circulation pump, which provides water pressure during washing. If the machine is gaining water, heating it, but the jets from the sprinklers are weak or absent at all, the problem may be in the impeller of the circulatory pump or in clogging of the nozzles of the skewers. In modern models with a motor EcoSilence Drive Diagnostics are more complicated and require electronic parameters to be checked.
Replacement of seals and elimination of leaks
The appearance of a puddle of water under the dishwasher Bosch A warning signal that requires immediate response. In addition to leaks through the hoses, wear of rubber seals is a frequent cause. The main seal of the door eventually loses elasticity, cracks and ceases to fit tightly to the body, letting water through during the wash cycle.
To replace the seal door does not need to disassemble the entire unit. Old rubber must be carefully removed from the groove around the perimeter of the door, clean the groove of grease and dirt, and then install a new part, starting with the corners. It is important that the seal lies flat, without tension and twisting, otherwise tightness will not be ensured.
Regular cleaning of door seals and lubrication of them with special silicone lubricant prolongs the life of rubber and prevents the appearance of microcracks.
Water can also appear due to cracks in the plastic elements of the body or pipes inside the machine. Cracks often form at places of vibration or thermal expansion of plastic. Water-resistant sealant can be used to temporarily eliminate small cracks, but in the long run, it is better to replace the damaged part.
- 🚿 Door Check the density of the fit and the absence of gaps around the perimeter.
- 🔧 Patrols Examine the internal connections for drops and traces of dried water.
- 🧱 bottom Make sure that water does not seep through microcracks in a metal or plastic pallet.
Electronic control module and wiring
The electronic “brain” of a dishwasher Bosch It is a complex device that is sensitive to voltage and humidity changes. If the machine behaves inadequately (it turns on itself, does not respond to buttons, randomly switches programs), the problem may be in the control module. Often the cause is the oxidation of contacts or failure of individual elements of the board, for example, capacitors or simistors.
Visual inspection of the board can reveal burned tracks, swollen capacitors or traces of soot. However, accurate diagnosis requires knowledge of electronics and the availability of soldering equipment. At home, the user can only check the integrity of the fuse on the board and the reliability of connecting plumes.
⚠️ Warning: Attempting to repair an electronic module without appropriate qualifications may result in the final failure of the board. If you are not sure of your abilities, it is better to replace the entire module or consult a specialist.
Wiring inside the machine is also aggressively exposed to steam and detergents. Insulation of the wires can dry out and crack, which leads to short circuits. Special attention should be paid to the wires going to the door, as they constantly move when opening and closing. A worn wire can cause a failure of the door position sensor or control buttons.
When assembling the machine after repair, use plastic clamps to fix wire harnesses in regular locations to avoid them touching hot parts or sharp edges of metal.
Why is the Bosch dishwasher not turned on?
The lack of reaction to the switch on may be caused by the lack of voltage in the socket, the operation of the machine in the shield, the failure of the network filter inside the machine or the breakage of the power button. It is also worth checking the integrity of the network cord.
How often should filters be cleaned in the dishwasher?
The manufacturer recommends washing the rough cleaning filters under running water after each wash cycle or at least once a week to prevent clogging of the drain system and the appearance of an unpleasant odor.
Can I wash aluminum dishes in Bosch?
Aluminum products can darken or oxidize under the influence of alkaline components of detergents. You can wash them, but the result may be unsatisfactory, which effect can damage the coating of dishes.
What to do if the car does not dry the dishes?
Check the use of the rinse, the temperature of the water at the exit from the tap, the serviceability of the TENS and the temperature sensor. Also make sure you don’t overload the machine and properly arrange the utensils for air circulation.