The fault in which the Bosch dishwasher issues an E2 error directly indicates a problem with the water drain from the work chamber. Unlike the E1 code, which signals leakage into the pallet, the E2 code means that the system cannot properly pump out the liquid after a wash or rinse cycle. The program is blocked automatically: the electronic module records that the water level in the tank did not fall to the required minimum for the allotted time, and forcibly stops the execution of the scenario.
Owners often see the following picture: the cycle is completed, but at the bottom of the car there is water, and the corresponding indicator is lit on the display or the “Finish” symbol flashes. Sometimes the pumping process is interrupted in the middle and the machine hums, trying to start the pump again, but without success. Ignoring this signal can lead to the fact that the remnants of food will begin to sour, an unpleasant smell will appear, and in the future, the failure of the circulatory pump due to dry operation or overload.
For accurate diagnosis, it is necessary to understand that the E2 error in dishwashers Bosch (and in the concern) Siemens, Neff) is not always a breakdown of the drain pump itself. The problem may lie in a banal blockage of the filter system, a compressed drain hose or a malfunction of the water level sensor (aqua sensor). In some cases, the electronics read false readings due to contact oxidation or voltage surges in the network.
Technical reasons for the error code
The main reason for the E2 code is a violation of the hydraulic balance in the drain system. Pump pump. The pump receives a command from the control module and starts to work, but the water either does not go away at all or goes away extremely slowly. The control module detects the pump operation time and, without receiving confirmation from the level sensor that the water has gone, forms an alarm.
Often the problem lies not in the electrical part, but in mechanical obstacles. Pieces of glass, seeds from fruits, fish scales or lumps of fat can block the impeller of the pump or create a cork in a corrugated hose. It is also worth considering the state of return-valvewhich prevents the backflow of water from the sewer. If the valve is stuck in the closed position, the water simply has nowhere to go.
A rarer but possible cause is the failure of the water-sensor. This sensor measures the transparency and water level. If its contacts are oxidized or physically damaged, it may send the wrong message to the processor that the tank is full, even if it is dry. In such cases, replacing the sensor solves the problem, but requires preliminary diagnosis with a multimeter.
⚠️ Attention: Before starting any diagnostic work, be sure to disconnect the dishwasher from the power grid. Working with electrical appliances under tension is life-threatening.
Primary diagnosis and simple solutions
Before you disassemble the technique or call the master, you should perform a number of simple actions that in 60% of cases help to eliminate the E2 error yourself. Often users forget about basic maintenance, and the car just "choked" from the dirt. Start by visually inspecting and cleaning the available nodes.
First thing you do, check. drain-hose. Make sure it is not bent, not passed by the table leg or the wall of the kitchen set. If the car is built in, it is possible that the hose was bent too much when installed. Also check the connection to the sewer: if the siphon of the sink is clogged, the water from the dishwasher will not physically be able to get there.
The next step is to check the filters. Even if they appear clean, a fat film can create a vacuum effect or simply slow down the flow of water. Remove the bottom basket, unscrew the rough cleaning filter and rinse it with hot water with degreasing agent. Pay attention to the grid: it should be completely transparent to light.
Step by step: filter cleaning and pump inspection
If the initial inspection did not give results, it is necessary to conduct a deeper cleaning of the drain system. This procedure requires care, as there may be sharp objects inside the machine (slices of plates, bones). To work, you will need a flat screwdriver, a water container and a flashlight.
Remove all the water from the pallet first. This can be done with a sponge or syringe if there is little water, or run a short pumping cycle (if the machine allows), substituting a low capacity under the hose. After removing the water, remove the groove of the lower sprinkler, unscrewing the fixing nut. Then remove the filter unit.
When you reach the bottom of the chamber, you will see the entrance to the drain pump. Often, this is where the main debris accumulates, which has passed through the filter. Carefully remove contamination with hands or tweezers. Check the rotation of the impeller pump with your finger (preliminary making sure that the machine is de-energized) - it should spin easily, without jamming and extraneous friction sounds.
Diagnostics of drain pump and electrics
If mechanical cleaning did not help, and E2 error in the dishwasher Bosch The problem may lie in the pump itself or its supply chain. A drain pump is an electric motor that can wear out over time. The winding of the engine can burn out, or the shaft can jam due to small debris that can not be obtained without disassembly.
A multimeter will be required to check the pump. It is necessary to ring the windings of the engine for a break or short circuit. Normal resistance of windings is usually between 150 and 300 Ohms (the exact value depends on the model). If the device shows infinity or zero, the pump must be replaced. Also check the integrity of the wires going to the pump for melting or chewing.
It is important to note that in some models Bosch system AquaStopThis includes a complex unit with valves and sensors. If the electromagnetic water discharge valve or the AquaStop module itself fails, the system can also produce a drain error. In such cases, the entire leak protection unit is often required to be replaced.
How to check the pump without a multimeter
spoiler: If you don’t have a tester, you can apply 220V voltage directly to the pump contacts (safety!). If the pump is humming, but not spinning, the shaft is jammed. If he's silent, the winding burns. If the spin is a problem in the module or sensors.
Table of common faults
For systematization of data and quick search of a solution it is convenient to use a summary table. It helps to compare symptoms with probable causes and methods of their elimination. Remember that the same error can be caused by different factors depending on the operating conditions.
| Symptoms. | Probable cause | Elimination method | Difficulty |
|---|---|---|---|
| Water is at the bottom, the pump is buzzing | Clogged impeller or hose | Mechanical cleaning | Low. |
| The water's not going away, silence. | Chain break or pump burnt | Replacement of pump | Medium |
| The error appears periodically. | Sticking of the level sensor | Cleaning contacts, replacing sensors | Tall. |
| The car is humming, but it's not rocking. | Pump shaft jamming | Disassembly and lubrication or replacement | Medium |
Specifics of AquaStop and Integrated Systems
Dishwashers owners Bosch full-leakage AquaStop The additional complexity of the diagnosis must be taken into account. The AquaStop unit is located at the inlet of the hose and contains a solenoid valve. If the valve does not open fully or closes prematurely, the water does not enter the desired volume or cannot circulate correctly, which indirectly affects the draining process and the formation of errors.
In addition, in modern models with intelligent control HomeConnect system Dosatron (automatic addition of detergent), E2 error may be associated with software failure. In this case, a full reset (Hard Reset) helps. To do this, you usually need to press the on button for 10-15 seconds or use the button combination specified in the instructions for a particular series (for example, VarioSpeed + Start).
⚠️ Attention: Do not attempt to disassemble the AquaStop block yourself if you have no experience. Inside is a pressure mechanism, and improper assembly can lead to serious leakage and flooding of neighbors.
The main conclusion: in 80% of cases, the E2 error is eliminated by careful cleaning of the filters and checking the drain hose for inflections.
Prevention and operation rules
To E2 Error in the Dishwasher Bosch It is not regularly available, and the rules of operation must be followed. The main enemy of the drain system is fat and large food residues. Always remove solid food residues from plates before loading, even if the manufacturer claims powerful filters.
Regularly, at least once a month, carry out preventive washing of the machine at maximum temperature using a special means for cleaning dishwashers. This will help dissolve fat deposits in the pump and hoses, which over time narrow the passage hole. Also watch for water quality: if you have hard water, use salt for dishwashers to prevent scale from forming on the heating elements and pump.
Check the drain hose periodically. If the car is long standing, the hose could "blown out" or flatten. Make sure that the lifting height of the drain hose (hinge) meets the instructions (usually 40-60 cm from the floor) so that water from the sewer does not flow back into the machine.
Useful advice: Once every six months remove and check the return valve at the connection point to the sewer. Often it is there that small debris brought from a common pipe gets stuck.
When a Master's Challenge is Necessary
Despite the possibility of self-repair, there are situations where without professional intervention can not do. If you checked all the filters, hoses, rang the pump and made sure the integrity of the wiring, and the E2 error in the dishwasher Bosch The problem is most likely the electronic control module.
Control board repair requires special knowledge, soldering equipment and software to flash or replace chips. Also, the wizard is needed if you need to replace the bearings of the pump (if the model allows you to change them separately) or if the problem is associated with complex sealing of the body after disassembly.
Remember that self-repair can lead to loss of warranty. If your car is less than 2 years old, it is better to contact an authorized service center immediately. Attempt to open the seals or replace the nodes independently cancels the manufacturer's warranty obligations.
Can I use a dishwasher with an E2 error?
It's not recommended. The constant presence of water on the bottom can lead to corrosion of metal parts, the appearance of mold and an unpleasant smell. Also, if the cause is a sensor malfunction, the machine may try to draw water again, leading to overflow and potential leakage.
How much does it cost to replace a drain pump?
The cost consists of the price of the spare part (from 1500 to 4000 rubles depending on the model) and the cost of the master's work. Original pumps Bosch They are more expensive than analogues, but they last longer. The exact price is better to check in the service center for your specific model.
Why does E2 only appear on long-term programs?
This may indicate that the pump is still working, but its performance has fallen (wear and tear of impellers or bearings). On short programs, he manages to pump water, and on long ones, where water is more or the cycle is more difficult, he can no longer cope with the volume for the allotted time.
How to reset E2 error without turning off the socket?
Most models Bosch A complete reset of the error is possible only by turning off the power for 15-20 minutes. Software reset buttons can remove the display, but if the cause is not fixed, the error will appear again the next time the pump cycle is started.