In detail: do-it-yourself Siemens dishwasher repair from a real master for the site my.housecope.com.
Understand the structure of the dishwasher, familiarize yourself with the main units of dishwashers in Fig. 1, their purpose and principle of operation.
LET'S CONSIDER DETAILED DESIGN AND OPERATING PRINCIPLE OF THE DISHWASHER:
Rice. 1 Dishwasher device
The device of dishwashers, regardless of the manufacturer and its model, can be represented by a single diagram in Figure 1. The main functions that the dishwasher performs after pressing the start button and closing the door are:
- Draining water (usually at the start of any selected program).
- Water filling.
- The beginning of the washing process.
- Adding detergent (included at the stage of loading the dishes).
- Heating water.
- Washing process (takes time depending on the selected washing program).
- Draining.
- Filling in rinsing water.
- Rinsing.
- Draining.
- Drying.
Eleven main functions are responsible for high-quality dishwashing. Eleven main functions are performed by functional units (parts, devices, peripherals) of dishwashers. The sequence of turning on / off the peripheral devices of the dishwasher is controlled by the electronic control module (hereinafter referred to as the processor) similar to that shown in Fig. 0.
Washing program - the sequence of instructions executed by the processor. Washing programs differ:
- time (duration of execution).
- the degree of water heating (from 50 ° C to 75 ° C).
- the presence or absence of the pre-soak function.
Let's consider the main units of dishwashers and their functional purpose using the example of the step-by-step execution of the washing program from start to its full completion.
Video (click to play). |
You have selected a washing program, added detergent, added rinse aid (optional), pressed the start (start) button and slammed the dishwasher door. What happens next?
1. THE PROCESSOR CHECKS THE DOOR CLOSING AND GIVES THE COMMAND "TO WASH AFTER THE PREVIOUS WASH OPERATION":
The lock in Figure 2 is responsible for closing the door (in Figure 1, see number 15). If the door is properly closed, the lock closes the contacts. This is a “door closed” signal to the processor. Having received the "door closed" signal, the processor sends a command to the drain pump Fig. 3, (in Fig. 1, see number 8) "drain the water". The drain pump begins to perform its function.
At the same time, the processor with a frequency of 5-6 seconds, within 2-3 minutes, gives the command "water fill". The water inlet valve Fig. 4 (in Figure 1, see number 17) opens, water enters the dishwasher. The drain pump runs continuously, pumping out water. After a certain period of time, the drain pump stops working. The rinsing operation from the previous dishwash has been completed.
2. THE PROCESSOR GIVES THE WATER SUPPLY COMMAND:
The water inlet valve opens. The dishwasher is drawing up water. The level (amount) of water collection is controlled by the water level sensor Fig. 5 (in Fig. 1, see number 7). The sensor is set to be triggered at a certain amount of water (sufficient for high-quality dishwashing). When a sufficient amount of water has been collected, the sensor sends a signal to the processor. The processor, having received a signal from the water level sensor, closes the water intake valve.
3.4. THE PROCESSOR GIVES THE COMMAND "START WASHING":
Do-it-yourself dishwasher repair, do-it-yourself dishwasher repair. The circulation pump rice 6 starts to work (see figure 1 under number 12).The circulating pump creates enough pressure in the dishwasher to circulate water. Water enters the impellers (sprinklers) Fig. 7 (in Fig. 1, see number 3), then into the holes of the impellers. From the holes of the impellers, water with a certain pressure force washes the dishes loaded into the baskets of rice 8 (see figure 1 under number 1). The impellers begin to rotate, which facilitates the dishwashing process. The dispenser (dispenser) Fig. 9 (in Fig. 1, see number 16) with detergent is opened. Detergent gets into the dishwasher.
5. THE PROCESSOR GIVES THE "WATER HEATING" COMMAND:
The mains voltage is supplied to the heating element Fig. 10 (in Fig. 1, see number 20). The water is heated up to the value corresponding to the selected washing program. The value of the water heating temperature is controlled by the water heating temperature sensor Fig. 11 (see figure 1 under number 4). When the water temperature reaches the required value, the sensor informs the processor about it. The processor disconnects the heating element from the mains, thereby stopping heating. The dishes will continue to be washed for some time. The washing time is controlled by the processor according to the selected dishwashing program.
THE PROCESSOR GIVES THE "DRAIN WATER" COMMAND:
The dishes are washed. The drain pump Fig. 3 starts to work (see figure 1 under number 8), pumping out the water. The water has been pumped out. The processor informs about the lack of water by the water level sensor Fig. 5 (in Fig. 1, see number 7). The next operation is the rinsing operation.
THE PROCESSOR GIVES THE "FILL WATER" COMMAND FOR RINSING:
The mains voltage is supplied to the water inlet valve. The valve opens to allow water to flow into the dishwasher. The water level sensor monitors the supply of sufficient water. When the amount of water in the dishwasher reaches the required value, the water level sensor informs the processor "water is filled".
The processor disconnects the water inlet valve from the mains, thereby stopping the flow of water into the dishwasher. The processor turns on the circulation pump. Water under a certain pressure enters the rocker arms (sprinklers), the process of rinsing the dishes begins. The processor gives a command to turn on water heating. The water heating level is controlled by a temperature sensor. When the water temperature reaches the required value (the processor informs the temperature sensor about this), the heating process stops. The rinsing process itself continues for some time. The rinsing time is written in the program that the processor reads from the external or internal memory.
10. THE PROCESSOR GIVES THE "DRAIN WATER" COMMAND AFTER RINSING:
At the end of the rinsing phase, the drain pump is activated. The water draining phase begins.
THE PROCESSOR GIVES THE "DRYING" COMMAND:
The drying process starts. To dry the dishes, cold tap water is automatically poured into the heat exchanger. All moisture quickly condenses on the cold left side of the wash cabinet and flows into the drain. After the drying process (15-20 minutes), the drain pump is turned on in order to drain off the remaining water after drying. Then the signal of the end of the washing process is heard.
That's all. This is the basic scheme by which almost all dishwashers work. After examining the structure of the dishwasher, you can repair the dishwasher yourself. Additions and deviations from the functions of the main modes are nothing more than an additional service from the manufacturer.
AQUASTOP SYSTEM:
Most dishwasher models are leak-proof. Most budget dishwashers have a tray with a float switch that stops operation when a leak is detected. The middle and top class models are equipped with an emergency valve that blocks the water supply to the machine. See the pictures below (aquastop hose and float fig 12).The aquastop hose is attached directly to the water supply pipe, the float is in the dishwasher pan.
In other words, the AquaStop system consists of a sump with a float and a microswitch, a heavy-duty flexible hose and a solenoid valve module, which is attached directly to the water supply. Figure 12. Water from a hose leak or depressurization of the machine enters the sump. When a certain amount of water is collected in the sump, the float floats up and closes the contacts of the microswitch. The supply of electricity to the safety valve is immediately cut off, the valve closes and shuts off the water supply. At the same time, water is pumped out of the base of the machine.
If the dishwasher refuses to work, analyze the information above, analyze the list of possible malfunctions below and perhaps you will receive an answer to the question "what happened?" and troubleshoot the dishwasher yourself.
Below is a list of common dishwasher malfunctions and how to fix them. This information was accumulated over the years of practice, and acquired structural forms. The information will be useful to both novice craftsmen and those who are used to repairing everything with their own hands. Below is a list of fourteen points characterizing the malfunction of the dishwasher. Knowing the contents of the items will make it easier to learn the secrets of the repair. Each item contains a detailed description of the logical troubleshooting paths of the item name. Knowledge will help fulfill DIY dishwasher repair... Repair the dishwasher yourself
Do-it-yourself dishwasher repair is the ultimate dream of every man. You really want to be indispensable in the eyes of a woman.
There are many helpers on the home appliance market today - dishwashers are among them. Anyone can afford such a car now. Finding a car according to your financial capabilities is not a problem now. Units that serve as dishwashers in your kitchens are made by many manufacturers and have different prices. Manufacturers Siemens, Electrolux, Bosh have developed such models that you will never have problems with. But any equipment breaks down sooner or later, and even if it is an assembly of well-known manufacturers, you will not be 100% insured against it.
Self-repair of dishwashers is possible when three qualities are combined: the desire to save money, learn how to independently make minor repairs of technical equipment and basic knowledge of technical disciplines in order to read the diagrams on your own.
Self-repair of dishwashers is the dream of every housewife
“How to repair a dishwasher” is a frequent question of housewives. Everyone can do a dishwasher repair on their own, you just need to learn a little. For this, a special forum has been created + dishwasher repair can be a simple task if there are people who can give good advice and good advice.
Here you can get acquainted with detailed instructions for repairing do-it-yourself dishwashing machines, useful tips for diagnosing machines of various brands. Here you can learn how to connect and install the machine, disassemble the main components in case of emergency. In fact, self-repairing a dishwasher, that is, with your own hands, is a simple and interesting task.
How to repair a dishwasher? Learn to read diagrams!
Your dishwasher is not working. What to do?
Experts will tell you that when the dishwasher, for some reason, is out of order, then you need to call the masters who will not only carry out diagnostics, but also repair the dishwashers + a forum where there are a lot of arguments that minor repairs are possible do it yourself. First of all, the instructions for repairing the dishwasher and this video will help you.
Many housewives have long acquired special devices for washing dishes, they make life much easier and save time. But they break down as often as all other household appliances. Repair of the Bosch SRS (Bosch), Ariston (Ariston), Electrolux ESF (Electrolux) dishwasher and others can be done at home with your own hands, without contacting a service center.
A dishwasher is a device designed for washing and rinsing various dishes (from dinner plates to pots, pans, etc.). The external simplicity of the design is very deceiving, since this device has a number of modules, regulators and other control mechanisms.
Photo - dishwasher
It can be built-in and free-standing. The built-in view technique is considered more convenient to use, since it does not require additional space. But at the same time, its repair is somewhat complicated by the lack of quick access to structurally important parts. The diagram looks like this:
Photo - dishwasher design
In the drawing you can see the standard design of the device. On the control panel (1), you can select and configure various operating modes, here you define the temperature, flow rate and water pressure. Time is controlled by a timer (14). When the settings are made, you need to load the dishes into the washing chamber. After the door latch (15) slams shut, the contacts close and, like in a washing machine, water begins to flow. Depending on the design, the machine can be connected to a boiler or boiler, then warm water comes from a hot water hose (7), at the outlet of which there is an inlet valve (9), or to heat the liquid independently using a heating element (12).
Photo - drainage
When the water is ready, it starts to spray onto the dishes from the top and bottom using the spray nozzles (2,3). Their operation is controlled by a valve (4), which is also responsible for ensuring that there is not a lot of water in the chamber. When the dishes are washed, the soapy liquid is removed by the drain hose (5), the chamber is rinsed. The latch opens and the dishes can be unloaded. In addition, the diagram indicates:
- 6 - this is the power cable that connects to the power supply network;
- 8 - filter, with the help of which the control and necessary purification of running water is carried out;
- 10 - motor;
- 11 - pump;
- 13 - gasket.
This device is very similar in all modern dishwashers: Ardo (Ardo), Elenberg (Elenberg), Beko (Veko), NEFF, Hansa (Hansa), Candy (Kandy) and others. The system can be complicated by the presence of various control functions, for example, additional cleaning or blowing the dishes. Before starting repairs, be sure to check the manufacturer's user manual and operating tips - it may not be removable.
Photo - reverse
Typical machine malfunctions:
- No water is supplied. This could be either a pump problem or a blockage in the filter;
- The device turns on but does not work. Sometimes it happens that a Samsung (Samsung), Hotpoint, Silanos SER or Indesit (Indesit) machine turns on, but cannot start. It could close the motor or pump;
- Does not turn on at all. The motor windings are burnt out, the power wire is damaged, there is no voltage in the outlet;
- The water is not drained. Probably, the sewage system, drain pipe or drain pump is faulty;
- Water flows from the door during operation. This, unambiguously, broke the door lock, which should jam and ensure the tightness of the container;
- There is no reverse. Reverse is a very important function of a domed and ordinary dishwasher, in the absence of which it is necessary to repair the timer or replace the motor windings;
- The water is not heated. A very common malfunction, which indicates a breakdown of the heating element or a malfunction of the time sensor, timer. If the machine is connected to a boiler, then it makes sense to check it for performance;
- Dishes do not dry.The fan and motor are responsible for this function.
Most of the faults mentioned above can be fixed on your own. The easiest way is to clean the filters. Depending on the design, it may not even be necessary to disassemble the device. To clean it, you need to remove all the grates from the chamber; there is a filter at the bottom under them. It can be installed on a threaded connection or simply inserted into a drain hole. Take it out and rinse it under running water. In order to eliminate odor, it is also recommended to wash with detergents.
Photo - panel removal
Step-by-step instructionWhat to do if the pump of a Zanussi ZDTS (Zanussi), Siemens (Siemens) or Krona BDE (Krona) machine is blocked:
- You need to turn off the water supply and remove the power cord;
- Unscrew the filter cylinder and pull the cleaner out. The pump blades must be carefully unscrewed and cleaned. Pay particular attention to openings that are often contaminated with grease or food debris;
- The pump cover is located under the filter. Press on it until it clicks and remove it from the container;
- The pump must be cleaned with a sponge or soft brush;
- Look carefully at its walls; broken dishes sometimes get here, which can break the tightness of the part. If cracks or holes are found, then the pump will have to be changed.
If the problem is in the engine or other internal part, the dishwasher will have to be disassembled for repair. This process is quite fast. You just need to unscrew all the screws that hold the case. Note that instead of removing all fasteners, try to pay attention only to those located near the breakdown site - this will speed up the process.
Photo - diagram of the whirlpool machine
Instructions on how to disassemble a dishwasher Whirlpool (Whirlpool), Siemens, Miele, Kaiser (Kaiser), AEG (AEG) for engine repair:
- You need to remove the lower front panel. Under it is the connection of the engine and pump, you also remove them;
- Water may remain in the pump and pipes, so prepare a container in advance to drain it;
- First remove the pump cover as described above. After that, the pump itself is turned out of the base and removed. The engine is located under it. Gaskets are often installed between the parts, therefore, proceed carefully so as not to damage the seals;
- Check the functionality of the parts. Reinstallation is similar.
If you are not confident in your abilities, then it is better to immediately contact a specialist. A quality master will not undertake to carry out urgent warranty repairs after preliminary intervention in the design of the dishwasher.
Video: how to repair dishwashers
We recommend that you familiarize yourself with:
There is no hassle-free technique - even premium representatives fail. Malfunctions also occur in the Siemens dishwasher. According to consumers, they break half as often as other brands.
What to do if a breakdown occurs? Pay attention to the work of the Siemens PMM, diagnose the problem and fix it yourself. Read below how to do this.
Siemens dishwasher error codes are collected and described in detail in a separate article.
The main causes of breakdowns in Siemens dishwashers are:
- The machine does not work, the display does not light up, or the program freezes. This may be due to the lack of voltage at the outlet. If you press the button and the program cannot be selected, the contacts may have burned out.
How to connect a car? It is necessary to disassemble the panel, clean or replace the contacts. - PMM does not collect water. Check the water supply immediately. Then inspect the filling system: the reason may be a clogged inlet hose, flow filter, intake valve.
- Why is a dishwasher bad at washing dishes? Perhaps the water supply valve is clogged, then the water pressure is too small, so the dishes are poorly washed.The nozzles on the rocker that sprays water can also become clogged. It is necessary to clean the system for the normal flow of water.
- The equipment was switched on as usual, but no water intake occurs, and the wash does not start. The reason is a loosely closed door.
How to adjust the door? It is enough to tighten the hinges of its fastening so that the lock passes normally into the hole. - When problems arise with the drain, the entire drain system is checked: filter, pump, hose. Parts are cleared of clogging. If the pump is broken, then the part changes.
- If the machine draws water, but the wash does not start, the problem is in the circulation pump. We need diagnostics and repairs.
- The dishwasher switches on an emergency shutdown. The reason is in the control module - in this case it is better to contact the wizard.
- The water does not heat up. We need to check the heating element, thermistor. The heater rings and is replaced in the event of a malfunction. The thermistor must also be replaced.
- The dishwasher does not dry dishes. If your model has a drying function, then the cause of the breakdown is in the drying fan or its wiring.
You figured out the main faults. Now you need to figure out how to fix breakdowns in a Siemens dishwasher.
Here are detailed instructions on how to start and repair the dishwasher. Let's start with the most common malfunction.
The water quality in the water supply system is poor. Foreign dishwashers are not designed for such impurities in the water, so the filter mesh in front of the valve quickly clogs up. Install a flow filter in front of the mesh to reduce blockages. Clean both elements periodically, then water will flow into the machine normally.
- Shut off the water supply.
- Disconnect the inlet hose from the PMM body.
- Remove the mesh filter and rinse under running water.
- If the dirt is heavily eaten, leave the filter to soak in a solution of water and citric acid (dissolve 100 g in 2 liters).
- Install the elements in reverse order.
If there are problems with the drainage system, the water will not leave after washing, overflow may occur. The blockage also causes the program to stop. For example, you start the car, water is collected, but the wash does not start.
How to disassemble and clean the system:
- Unplug the machine from the power supply, turn off the water.
- Open the hopper door and remove all trays and baskets.
- Unscrew the drain filter from below.
- Unclog it by rinsing with running water.
- How to unblock the pump? Use a sponge to remove excess water from the pump area.
- Press in the pump cover until you hear a click, pull it towards you.
- Inspect the pump for clogging. Wear gloves when cleaning, as the pump could become clogged with glass shards.
To avoid blockages, remove food debris from dishes before washing. Also use special cleaning agents.
The cause of the breakdown can be not only a blockage, but also a breakdown of the pump. How to check it:
- Remove the lower faceplate of the machine. To do this, unscrew the fastening screws.
- Lay the machine on its side or tilt it back.
- It is necessary to measure the resistance at the pump contacts.
- Attach the ohmmeter test leads to the pump contacts.
- The device is operational if the number on the screen is 1000-1500. In other cases, a replacement is needed.
Over time, when using a Siemens machine, the quality of the wash will decrease. You load it as usual, pour in the detergent, but the dishes at the outlet are not very clean. Why does this happen:
- The water pressure in the water supply is too low.
- The product valve is clogged.
- The holes in the rocker arms are clogged.
- Wait until normal water supply resumes.
- Check the mesh filter for clogging.
- Clean the detergent drawer after each cycle. Over time, the powder accumulates, dries on the walls, growths block the valve passage. Just wipe the tray with a dry cloth after washing the dishes.
- The dishwasher has two rocker arms for spraying water - an upper and a lower one. Unscrew the top one and remove it from its seat.Pull the lower blade up and out of the housing. Clean the blade holes with a toothpick under running water.
Do not forget to take care of the equipment, then breakdowns will happen less often.
If the indicators on the panel are flashing randomly, an emergency shutdown occurs, the reason is in the control module. Only a master can diagnose a module breakdown and, moreover, repair it. The design of the Siemens dishwasher complicates this task.
The manufacturer has enclosed the control board in a soldered block. Most specialists refuse to repair it.
The module is one of the most expensive dishwasher parts. Therefore, if the car is old, it is more profitable to buy new equipment than to change the module.
Carry out self-repair of equipment only after the expiration of the warranty period. Use cleaning agents, clean the filters in a timely manner. Then you don't have to deal with malfunctions and fix breakdowns at home.
Siemens dishwashers are rightfully considered the most reliable. Quality parts plus excellent European build speak for themselves. Nevertheless, this technique also requires repair. For most, a Siemens car breaks down after 10 or more years, for some it may break down after a couple of months, but sooner or later it happens. How to repair Siemens dishwashers, what typical malfunctions occur in such dishwashers and is it possible to repair such equipment with your own hands, we will talk about this further.According to the data provided by the specialists of the service centers, Siemens dishwashers break down about 2 times less often than most budget dishwasher brands and middle class brands. But Siemens still has some weak points. The most common malfunction is considered, the main symptom of which is an extremely slow set of water and a periodically freezing dishwashing program, and the choice of the program does not matter.
After a while, if the operation of the Siemens dishwasher continues, it will start giving error E16, at first occasionally, then more and more often. Ultimately, the car will freeze completely, giving an E16 error and restarting will do nothing. What kind of breakdowns give rise to these symptoms? In fact, there is only one reason - a flow-through filter in front of the filler valve.
Dishwashers Siemens European assemblies are designed for well-purified water with a minimum amount of impurities and suspensions, their flow filters have a mesh with very small cells, which quickly clogs when connected to a Russian water supply system. To make the standard filter less clogged with dirt, it is necessary to install another purifying flow filter in front of it, and it is necessary to remove both filters every 6 months and rinse them.
Important! In addition to an additional filter, experienced craftsmen use one more protective measure - they immediately change the standard filter. Recently, the manufacturer began to produce spare parts (including filters) specifically for Eastern Europe and Russia. It is these filters that experts recommend installing when installing a machine with their own hands.
How to resume the normal set of water in the dishwasher and prevent the systematic freezing of the washing program with your own hands, without the help of a specialist?
- We reliably shut off the water going to the Siemens dishwasher.
- We extend the dishwasher so that reliable access to the inlet hose and its connection points is opened. But do everything carefully so as not to pull out or pinch the hoses and power cord.
- Disconnect the hose along with an additional filter (if any) from the tee tap.
- We unscrew the hose on the other side of the dishwasher and from there we unscrew the standard filter.
- Wipe the filter seat with a dry, clean, lint-free cloth.
- Pour lemons (100 g per 2 liters of water) into a small basin, pour warm water and soak both filters in this solution for 2-3 hours, then rinse and clean the filters from dirt and put them back together with the hose.
Also, quite often Siemens dishwashers after 1-1.5 years of operation begin to wash the dishes worse. At the same time, the user adds the same detergent to the cuvette, in the same amount, also folds the dishes, selects the same washing program, in general, does everything as normal, and the washing quality becomes worse and worse. What is the cause of this annoying symptom? Strictly speaking, there are several reasons:
- weak water pressure;
- the detergent supply valve does not work well;
- the rotating rocker nozzles are clogged.
Weak water pressure occurs due to the clogging of the inlet filter in the inlet valve.
We have already discussed how to clean it with our own hands in the framework of the previous paragraph. Therefore, we immediately turn to the second reason - the detergent supply valve does not work well.
The essence of the problem is as follows. Powder or tablets Finish for the dishwasher are placed in a special compartment, from where they are taken away gradually during the washing program. If this compartment is not cleaned and rinsed, then the valve will begin to open and close poorly over time, and its holes will become clogged with dried residues of half-dissolved powder. As a result, during washing, the powder or tablet will dissolve worse, and the quality of the dishwashing will only be worse.
The problem is solved simply. It is necessary to make it a rule to wipe the detergent drawer with a clean dry cloth after each dishwashing. and then this problem will never visit you again. It is also a good idea to periodically use dishwasher cleaners to prevent dirt from accumulating in the dishwasher and remove any unpleasant odors.
The same with the clogged nozzles of the Siemens dishwasher rocker. They must be cleaned once every 4-6 months, otherwise there will be no water pressure, and the quality of the sink will decrease. The nozzles are cleaned with an ordinary toothpick. Push it one by one into all the holes of the rocker arm, and then start the empty sink with dishwasher cleaner.
We have considered the malfunctions associated with the reduced quality of washing, now we turn to the problems with the disposal of waste water. Why can Siemens dishwashers have a problem with water? There are two main reasons: either there is a blockage somewhere in the drainage path, or the pump is out of order. We have repeatedly considered cleaning the dishwasher from blockages. This process is well described, for example, in the article Replacing and cleaning the dishwasher filter, we will not dwell on this point again.
In general, the dishwasher, as well as any equipment, should be monitored, if this is not done, soon breakdowns are inevitable. A pump breakdown is a much more unpredictable situation. You can keep a good eye on a Siemens dishwasher and still end up in a similar situation. You can read how to replace the pump in a dishwasher with your own hands in the article of the same name, it is not too difficult. But first, the pump needs to be checked, maybe it is not broken, but the matter is in the electrics or electronics?
- We arm ourselves with an ohmmeter and remove the front lower panel of the Siemens dishwasher.
- Disconnect the machine from the network and tilt it back a little (about 20 0).
- Now we can clearly see the pump, fixed on the circulation pump housing, set the minimum value on the ohmmeter, and then install its probes on the pump contacts.
- We measure the value, if the figure is in the range 1000-1500 - everything is fine, if less, the pump is faulty.
For your information! A faulty pump is not necessarily "silent" while the dishwasher is running. It can hum, but at the same time it does not fulfill its function of pumping water.
Another problem of modern models of Siemens dishwashers is a spontaneous emergency shutdown, which is preceded by flashing indicators and sound signals. Moreover, if the dishwasher is disconnected from the mains, and then turned on again, the problem repeats, it is completely impossible to wash the dishes. What is the cause of the problem?
Unfortunately, this breakdown is one of those that cannot be eliminated by hand. If your car is under warranty, experts advise getting rid of it altogether. The fact is that such symptoms indicate a breakdown of the control module.
On Siemens, it is much more difficult to repair the control unit, since the board is sealed by the manufacturer into a non-separable module. For this reason, only some masters undertake to repair it, basically all refuse and offer to change the entire unit, and this is almost half the cost of a new dishwasher. If the car is old, then it is better not to repair it at all with such a breakdown, although it is up to you to decide.
In conclusion, we note that Siemens dishwashers are very, very reliable, their malfunctions are largely due to the improper operation of users. Therefore, if you keep an eye on your dishwasher, it is very likely that it will work for many years without any glitches.