The appearance of a lit indicator with the image of a faucet on the control panel of the dishwasher Bosch is a signal that cannot be ignored. This error, often coded as E09 or E10 depending on the series, indicates problems with the water supply or its leakage. Owners of household appliances encounter this code both at the first start and after several years of operation, and there is no need to panic, since in most cases the problem can be solved independently.
Modern models Bosch Serie 4 and Serie 6 equipped with a sophisticated self-diagnosis system that blocks the start of the washing program if critical deviations are detected. If the red tap symbol is lit on the display or among the buttons, this means that the control module did not receive a signal about a sufficient water level in the tank within the allotted time, or the leakage protection has activated. Understanding the physics of the process will help you quickly localize the fault and avoid calling a technician.
In this article we will analyze in detail the algorithm of actions when such an indication appears. We will consider both trivial reasons such as a closed valve, and more complex technical faults that require disassembling the case. It is important to act consistently so as not to damage the electronics and make the situation worse.
Interpretation of the indication and operating principle of the protection system
Tap indicator on dishwashers Bosch serves a dual function depending on the specific model and context in which the error occurs. On base models without a digital display, this symbol simply glows red to indicate that the machine is not drawing water. In more advanced versions, a flashing tap can indicate a leak in the pan, and a constant tap can indicate a lack of pressure in the line.
The operating principle is to monitor the tank filling time. When you run the program, intake valve opens and water flows into the machine. The control module records the time. If within a certain interval (usually several minutes) the water level does not reach the desired level, an error is recorded. This is a safety mechanism that prevents the pump from running dry, which could lead to burnout.
⚠️ Attention: If the faucet indicator lights up during the wash cycle and the machine begins to pump out water, this is a sign that the system is activated AquaStop. In this case, immediately turn off the water supply valve on the hose.
It is also worth considering that some models Bosch use combinations of flashes. For example, the simultaneous lighting of the tap and the program selection button may indicate specific sensor errors. Therefore, primary diagnosis always begins with a visual inspection and testing simple hypotheses before moving on to complex measurements with a multimeter.
Primary diagnosis: external factors and water supply
Before you grab a screwdriver, you need to eliminate external factors. Often the reason is trivial: one of the household members accidentally turned off the valve on the pipe, or the pressure in the water supply system dropped. Check if the water supply valve is fully open. If you have a coarse filter, it could become clogged with rust or sand, especially after maintenance work on the water supply.
The next step is to check the water supply hose. Make sure that it is not twisted, crushed by furniture or has any visible damage. In hoses with system AquaStop (bulge at the end) there may be a solenoid valve inside, which also requires electrical power. If the hose is damaged or its electrical part is faulty, the machine will not open the water supply.
- 💧 Check the pressure in the water supply: open the faucet in the kitchen - the pressure should be strong and stableilny.
- 🔌 Make sure that the appliance plug sits tightly in the outlet and that the voltage in the network is stable.
- 🚰 Inspect the connection between the hose and the water supply for leaks.
- 🧹 Check the mesh filter at the entrance to the car: unscrew the hose and evaluate its cleanliness.
Particular attention should be paid to the mesh filter. This is a small detail that often becomes the cause of all troubles. If the water is hard or there is a lot of rust in the pipes, the filter becomes clogged in a matter of months. You can clean it with an old toothbrush under running water. This simple procedure eliminates the problem in 40% of cases.
Internal faults: valves and level sensors
If external causes are excluded, the problem lies inside the case. The most likely candidate for replacement is intake solenoid valve. This device controls the flow of water. Over time, deposits accumulate on its membrane, or the solenoid coil burns out. As a result, the valve simply does not open upon command from the control module.
The second important element is pressure switch (water level sensor). It tells the module how much water has already been collected. If the tube going to the pressure switch is clogged or a water plug has formed in it, the sensor will transmit incorrect signals. The machine may think that the tank is full and not open the valve, or, conversely, pour water endlessly until the emergency drain is triggered.
| Component | Problem Symptom | Test method | Probability of failure |
|---|---|---|---|
| Inlet valve | There is no water flow, there is a clicking sound or silence | Testing the coil with a multimeter | High |
| Pressostat | Overfilling or underfilling water | Purge the tube, check the contacts | Average |
| Filter mesh | Weak pressure, long set | Visual inspection | Very high |
| Control module | No voltage on valve | Voltage measurement at the board output | Low |
To diagnose the valve, you will need a multimeter. It is necessary to remove the side wall of the machine (after turning off the power!), find the valve and measure the resistance of its winding. A normal value is usually in the range of 2 to 4 kOhms. If the device shows one (open) or zero (short circuit), the part must be replaced.
AquaStop system and leak protection
Many models Bosch equipped with a complete leakage protection system AquaStop. Unlike partial protection, here the hose is enclosed in an additional casing, and at the end there is a block with a valve. If this unit fails or water appears in the machine's sump (at the bottom of the cabinet), the faucet light will come on, often in combination with an error code E15.
The protection mechanism works as follows: a foam float is located at the bottom of the machine. When even a small amount of water gets in, the float floats up and mechanically presses the microswitch. This switch instructs the module to turn off the water and turn the drain pump into continuous mode. This is why the machine can hum, even when the button is turned off, until the pan is dry.
How to dry a pallet without disassembling?
You can try tilting the machine forward 45 degrees (with a cloth on it) so that the water flows onto the floor. However, this is a temporary measure - the sensor will be reset, but the cause of the leak will remain.
A common cause of false positives AquaStop is an excess of foaming agent. If you use regular dishwasher tablets in the Eco mode or add too much salt, foam will form, which will penetrate into the tray and activate the protection. In this case, it is enough to rinse the car thoroughly and let it dry.
Algorithm for self-repair and replacement of parts
If the diagnostics indicate a malfunction of internal components, proceed with repairs. To replace the inlet valve or pressure switch, you will need to remove the side wall of the dishwasher. Most models Bosch it is fixed with two screws at the back and moves back and down. Do not forget to first disconnect the device from the power supply!
Replacing the intake valve takes about 15-20 minutes. After removing the wall, locate the entry point of the water supply hose. The valve is attached to the body with latches or screws. Disconnect the electrical connector and the hose going to the sprinkler. Install the new part in reverse order, making sure the connections are tight.
☑️ Checklist before assembling the machine
When working with a pressure switch, it is important not to damage the thin silicone tube. It can be blown out with your mouth or removed and washed in warm water. If the sensor itself is faulty, it is replaced entirely. After assembling all components, carry out a test run with the door open (if the design allows) or carefully monitor the water intake process in order to notice a leak in time.
Prevention and proper operation
To prevent the burning faucet error from becoming a regular guest, follow the operating rules. Regularly, at least once every six months, unscrew and wash the inlet filter. If you have very hard water, it makes sense to install a main filter-softener at the entrance to the apartment, which will extend the life of not only the dishwasher, but also the washing machine and boiler.
Use high-quality detergents designed specifically for dishwashers. You should absolutely not use regular dishwashing detergent., since it creates abundant foam, which is the main cause of false alarms of leakage sensors and blockages in the circulation system.
- 🧼 Regularly clean the filters in the bottom of the wash from food residues.
- 🧂 Monitor the salt level in the softener and add it as needed.
- 🔍 Once a month, inspect the hoses for microcracks and darkening.
It is also recommended to let the machine idle once a year with a special dishwasher cleaner. This will help dissolve grease deposits inside the hoses and pump, which over time can impede water flow and distort sensor readings.
When purchasing a new AquaStop hose, pay attention to the length of the electrical cable. For different Bosch models, the length of the wire may vary, and a short hose may simply not reach the connector in the car.
Frequently asked questions and difficult cases
Sometimes users are faced with a situation where all the parts are working, the filter is clean, the pressure is normal, but the error does not disappear. In such rare cases, the problem may lie in the control module itself. A burnt triac, which is responsible for supplying voltage to the valve, will not allow water to flow into the machine. Module repair requires qualifications and soldering equipment.
Another nuance is a software glitch. Electronics Bosch reliable, but power surges can cause the logic to freeze. Try performing a full reset: unplug the machine for 15-20 minutes, then turn it on and hold down the program reset button (usually the “Start” button or a special combination specified in the instructions) for 3-5 seconds.
⚠️ Attention: If after all the checks and replacement of the valve the error persists, do not continue the experiments. Repeated attempts to draw water can lead to flooding of neighbors. Call a specialist for an in-depth wiring diagnosis.
Remember that a timely response to the “burning tap” signal saves you from costly repairs. Ignoring the problem or trying to “start the machine by force” (if this is successful) will lead to damage to the heating element (heating element), which will burn without water, or to failure of the circulation pump.
In 80% of cases, a burning tap on a Bosch can be treated by cleaning the inlet filter or restoring pressure in the water supply.
Why does the faucet light up if water flows normally into the car?
This indicates a malfunction of the water level sensor (pressostat) or a clogged tube going to it. The machine takes in water, but “does not see” it and continues to wait until the time runs out and the error light comes on. It is also possible that the wiring from the sensor to the module may be broken.
Can I use the dishwasher if the faucet indicator is blinking?
It is not recommended to operate equipment with an active error. If this is an underfilling error, the heating element or pump may burn out. If it is a leaking fault (AquaStop), the machine will constantly drain water, resulting in overuse and the risk of flooding.
How to reset error E09 on a Bosch dishwasher?
Usually the error is reset automatically after the cause is eliminated and the program is restarted. If the indicator is constantly on, try turning off the machine with the button, then unplug it for 10 minutes. In some models, holding the Reset button for 3 seconds helps.
What should I do if the error does not go away after replacing the valve?
It is necessary to check the integrity of the electrical circuit: ring the wires from the control module to the valve. The wire may be broken or the contact in the connector has oxidized. It is also worth checking the voltage at the output of the control board when the program starts.
The faucet is on and the machine is humming, but it doesn’t draw water - is it a pump?
Most likely not. When there is no water intake, the hum most often comes from the intake valve itself, if voltage is applied to it, but it is mechanically jammed or clogged. The pump (circulation) usually turns on after water has been collected. However, if the drain pump hums, this is a sign that the leak protection has been activated.