Sudden stoppage of the dishwashing cycle and flashing or steady faucet light on the dishwasher control panel Bosch - this is a signal that cannot be ignored. The self-diagnosis system of the German manufacturer is designed in such a way that it blocks the launch of the program at the slightest suspicion of a water leak or problems with the resource supply. For the user, this means that the equipment has gone into emergency mode, and further operation without finding out the reasons can lead to flooding of the kitchen or failure of expensive components.
There is no need to panic, since in most cases the problem is solved on its own in 10–15 minutes without calling a technician. However, it is important to correctly interpret the behavior of the indicators, because a burning faucet can mean either a lack of water in the water supply system or an overflow of the pan into which water flows due to an internal leak. Understanding the difference between these conditions will save you time and money.
In this article we will analyze in detail all possible scenarios, from a banal closed valve to a complex replacement aquastop valve. You'll learn how to decipher specific error codes on the digital display, if equipped, or how to understand the blinking light on models without a screen. Correct diagnosis is the first and most important step to restoring the functionality of your household appliances.
Interpretation of the indication: what does a flashing or burning faucet mean?
On dishwashers Bosch The water problem indication may look different depending on the series and year of manufacture of the device. In modern models with a digital display (Silence Plus, Serie 6, Serie 8) the problem is accompanied by a specific error code that is displayed on the screen. In simpler models, where the display is replaced by a set of LEDs, a fault is indicated by a flashing tap symbol or its constant lighting.
If the light is constantly on, this most often indicates that the machine is not drawing water at the set time. The system waits for a resource to arrive, the timer expires, and the loop is blocked. If the tap symbol flashes, especially if the pump is running, this is a sure sign that the system is activated AquaStop. Water had accumulated in a sump at the bottom of the machine, and the float switch rose, commanding the pump to pump out water continuously to prevent a flood.
It is important to distinguish between these two states, since the algorithm of actions will be radically different. In the first case, we are looking for the reason for the lack of water in the external circuit, in the second, we are fighting an internal leak. Misdiagnosis can lead to you cleaning filters pointlessly when the problem lies in a broken hose inside the housing.
- 💧 Constantly lit: No water intake (low pressure, closed tap, clogged).
- ⚡ Flashing + pump humming: AquaStop has triggered (leakage inside the housing).
- 🔢 Code on display: E09, E15, E24 - different variations of water problems.
⚠️ Attention: If the tap symbol is flashing and the machine is humming (the drain pump is running), immediately disconnect the appliance from the power supply! Continuing to run the pump idle can burn out its motor.
Error codes related to water supply and drainage
For dishwasher owners Bosch I had better luck with the display: the machine itself will tell you what exactly happened. The most common codes associated with water supply are divided into two groups: dial errors and drain errors. Understanding their meaning allows you to immediately cut off unnecessary diagnostic options.
Code E09 (or E0A) usually indicates that water has not filled within the allotted time. This may be due to a lack of pressure in the central line, a kinked inlet hose, or a faulty inlet valve. The machine tries to draw water, the level sensor (aqua sensor) does not detect its presence, and the process is interrupted.
Code E15 (or E14, E16 depending on the firmware) - this is the most serious signal, indicating the activation of the leakage protection system. Water got into the pan and the car went into emergency mode. In this case, the electronics block the intake of new water so as not to worsen the situation. Also often found is the code E24, which indicates a problem with the drain: water has accumulated, but cannot leave due to a clogged filter or sewer.
| Error code | Description of the problem | Probable Cause | Difficulty of repair |
|---|---|---|---|
| E09 / E0A | Problem with water supply | The valve is closed, the filter mesh is clogged | Low |
| E15 / E16 | Leakage (AquaStop) | Water in the pan, the float has tripped | Average |
| E24 | Drain problem | Clogged drain filter or hose | Low |
| E22 | Filter clogged | Filter element dirty | Low |
It is worth noting that codes may vary depending on the specific series Bosch. For example, in some models Maxx or Classixx codes may not be displayed in numbers, but transmitted by the number of flashes of the drying or salt indicator. In such cases, you must consult the technical documentation for your specific model.
Hidden codes for service engineers
Some Bosch models have a service diagnostic mode, where you can see more detailed parameters of the sensors. To enter this mode, you usually need to hold down a combination of buttons (for example, “Program” and “Start”) when turning on the machine. However, without special equipment and knowledge, it is difficult to interpret this data, so it is better for the home master to focus on the standard E-series codes.
Checking the external water supply circuit
Before disassembling the dishwasher Bosch, it is necessary to exclude external factors. Often the reason is trivial: the water pressure in the house has dropped, or one of the household members accidentally closed the valve under the sink. Diagnostics always starts with the simplest.
The first thing to do is check if the water supply tap is open. It is usually located under the sink. Make sure it is turned parallel to the pipe (open). If you have a system AquaStop with a solenoid valve at the end of the hose, listen: when you start the program, you should hear a characteristic click and beep of the valve opening.
Next we check the pressure. Unscrew the inlet hose from the machine (after turning off the water!) and direct it into a bucket. Open the tap. If the water flows with a powerful string, everything is in order with the flow. If it flows in a thin stream, the problem is in the plumbing or in the valve itself. Also inspect the hose for kinks, especially if the machine is built into a narrow niche and has recently been extended.
- 🔍 Check if the inlet hose is kinked.
- 💦 Make sure there is cold water in the house (open the tap on the mixer).
- 🚰 Inspect the place where the hose connects to the water supply for blockages.
Pay special attention to the mesh filter. At the entrance to the dishwasher, where the hose is screwed on, there is a fine metal mesh. It protects the valves from rust and sand. Over time, it becomes clogged and water simply cannot get inside. Unscrew the hose, remove the mesh with pliers and rinse it under strong pressure.
☑️ Water supply diagnostics
Diagnosis of internal leakage and AquaStop system
If the faucet indicator is flashing and the pump is humming, it means that the leakage protection system has worked. In dishwashers Bosch it is implemented very reliably. At the bottom of the housing there is a plastic tray containing a polystyrene float. When water gets there, the float floats up and mechanically or electrically (via a microswitch) gives an alarm.
The reason for water getting into the pan can be different. This could be a microcrack in the tank, a burst pipe, a loose clamp, or a simple overflow due to the use of an unsuitable detergent (for example, hand washing powder, which produces a lot of foam). The foam overflows the chamber, and the water goes down through the technological holes.
To eliminate this malfunction, the machine will have to be removed from its installation location. You will need to remove the side panel (usually the left one when viewed from the front, but for built-in models this may require removing the top cover and dismantling). The goal is to scoop the water out of the pan and dry it. Until the float goes down, the machine will not work.
⚠️ Attention: Before removing the side panels, be sure to unplug the dishwasher! The internal components are energized at 220V, and water is an excellent conductor.
Once you have removed the water and dried the pan, reassemble the machine and run a test wash. If the error disappears, you are lucky, it was a one-time failure or overflow. If after a few minutes or cycles an error E15 (burning faucet) appears again, which means there is an active leak somewhere. You will have to look for a wet spot while the car is running, placing dry wipes under suspicious components: pump, pipe connections, door seal.
Use paper towels to check for leaks. Wipe all connections dry, start the machine and apply a dry cloth to the connections of the pipes. Where the napkin instantly becomes wet is the source of the problem.
Clogged filters and drainage problems
Sometimes a burning faucet is a consequence of the machine being unable to drain dirty water, and the system is blocking redemption. If there is still water in the tank after the cycle ends, check the filtration system first. In dishwashers Bosch An effective but maintenance-requiring filter system has been installed.
The filter consists of two parts: a coarse mesh (plate) and a fine cylindrical filter. They are located at the bottom of the washing chamber. If they have not been cleaned for a long time, grease and food debris form an impenetrable crust through which water cannot pass. The pump cannot pump water, the level sensor detects its presence, and the machine generates an error.
To clean, you need to remove the filter by turning it counterclockwise. Wash all parts with hot water, dish soap and a soft brush. Do not use hard brushes to avoid scratching the plastic. Also check the drain pipe that goes from the filter to the pump - lemon seeds or glass often get there.
Don't forget to check the drain hose that goes to the sewer. It may be bent, or a plug of fat has formed at the connection to the siphon. Disconnect the hose and blow it out. If the machine is connected correctly, there should be a loop on the hose, fixed at a height of 40–60 cm from the floor, so that dirt from the sewer is not sucked back.
90% of problems with drainage and subsequent erroneous water intake are solved by thoroughly cleaning the filter unit and checking the drain hose for kinks.
Electronics and valve malfunctions
If all of the above does not help, and the water flows, the filters are clean, and there are no leaks, the problem lies in a faulty component. Most often it fails intake valve. This is an electromagnetic device that opens the way for water. Over time, a breakdown may appear on the coil, or the valve stem may mechanically jam due to scale.
Another suspect is the water level sensor (aqua sensor). It is a transparent chamber with a float, usually located at the bottom of the machine. If it is dirty or stuck, it does not give a signal that water has been filled, or, conversely, it falsely signals that it is overflowing. You can try to clean it, but it often needs to be replaced.
In rare cases, the problem is in the control module. If voltage does not come to the valve (checked with a multimeter), although the program requires water to be drawn in, the triac on the control board may have burned out. This is a complex repair that requires soldering or replacing the module.
- 🔌 Inlet valve: Check with a multimeter for a coil break (norm: 3–5 kOhm).
- 📏 Aqua sensor: Checking the mobility of the float and the cleanliness of the chamber.
- 🧠 Control module: Check for voltage at the valve contacts.
To replace the valve, you must remove the right side wall (for most models Bosch). The valve is attached to the body and connected to the inlet hose. Before dismantling, be sure to turn off the water. The new valve must have exactly the same part number as the old one, since they differ in response pressure and hole diameter.
Frequently asked questions (FAQ)
Can I continue to use the dishwasher if the faucet is on?
Strongly not recommended. If the leak code (E15) is on, further operation will lead to flooding of the neighbors. If there is an error in the water supply (E09), you risk burning the heating element (heating element) if it turns on without water, or damaging the pump.
Why does my Bosch dishwasher buzz after the wash is finished?
This means the drain pump is running. Most likely, AquaStop has triggered (there is water in the pan) or the drain filter is clogged, and the machine is trying to pump out the remaining water. You need to check the filters and pan.
How to reset error E15 on a Bosch dishwasher?
There is no dedicated reset button. The cause must be eliminated (drain the water from the pan). After the pan dries and the float lowers, the error will reset automatically the next time you turn it on. Sometimes disconnecting from the network for a long time (15–20 minutes) helps.
What should I do if the error does not go away after cleaning the filters?
This means the problem is deeper. The pump itself (impeller) may be clogged or the water level sensor may be faulty. A deeper disassembly of the machine is required for inspection of internal components.