If your dishwasher control panel Bosch the indicator in the form of a faucet lights up, this is a signal that the system has detected a problem with the supply or drainage of water. In most cases, appliances block the program from starting to prevent flooding of the kitchen or failure of internal components. This symbol may flash or stay lit to indicate different stages of diagnostics carried out by the electronic control module.
There is no need to panic right away, since often the reason lies in a banal blockage or a pinched hose, which can be easily fixed on your own without calling a technician. However, ignoring this signal can lead to more serious consequences, including pump failure or water leaking onto the floor. Understanding the logic of the protection system will help you quickly locate the fault and return the equipment to working condition.
In this article, we will analyze in detail all the possible reasons for the appearance of the crane icon, from simple mechanical obstacles to complex sensor failures. You will learn how to correctly interpret a flashing or lit indicator, what steps to take for initial diagnosis, and when professional intervention is really necessary.
Decoding indicator signals and error codes
The first thing you need to do when the faucet symbol appears is to understand exactly how it behaves. On modern models Bosch series Maxx, Silence or Exquisit the behavior of the indicator carries different meanings. If the faucet is constantly on, this most often indicates a problem with water supply or pressure in the system. The machine is waiting for a resource to arrive, but the timer has expired and the required volume has not yet been accumulated.
The situation changes if the indicator starts flashing. A flashing faucet often indicates problems with the drain or that the system has tripped Aquastop. In this case, the electronics detect the presence of water in the pan or the inability to pump out the waste liquid. Some models also display a digital error code, which greatly simplifies diagnostics.
⚠️ Attention: If the faucet indicator flashes in combination with the beep and door lock, do not try to forcefully open the machine. There may be hot water or excess pressure inside.
For accurate diagnostics, it is recommended to run the self-test mode if your model supports such a function. This can be done through a specific combination of buttons described in the instructions for a specific model. The table below lists the main water supply-related error codes that may correspond to a burning faucet:
| Error code | Description of the problem | Probable Cause |
|---|---|---|
| E09 / E19 | Problem with water supply | The tap is closed, there is no pressure, the valve is faulty |
| E24 / E25 | Drain error | Filter clogged, hose kinked, pump broken |
| E15 | Activation of Aquastop | Water in the pan, leak in the system |
| E05 | Pressure problem | Malfunction of the pressure sensor (pressostat) |
Understanding the error code allows you to immediately cut off unnecessary check options and focus on a specific node. For example, code E15 requires you to immediately unplug the machine and check the floor for moisture, while E09 forces you to look first at the water tap.
Water supply problems: from tap to valve
The most common reason why the faucet lights up is trivial - the lack of water at the entrance to the car. The check starts with the most obvious: make sure the cold water valve on the pipe is fully open. Sometimes household members may accidentally block it during cleaning or repairs. It is also worth checking whether there is water in other taps of the apartment in order to exclude general problems with the water supply.
If there is water in the tap, but the machine does not see it, the next step is to check the inlet mesh filter. It is located where the inlet hose connects to the dishwasher body. Over time, rust, sand and scale accumulate on it, which block the flow of water. To clean, you need to turn off the water, unscrew the hose and carefully remove the mesh with tweezers.
☑️ Water supply diagnostics
Another important element is the water supply solenoid valve. It is this that opens upon a signal from the control module. If the valve is stuck or its coil is burned out, water will physically not be able to get into the tank. You can check it with a multimeter by measuring the winding resistance, but this will require partial disassembly of the housing.
How to check pressure without a pressure gauge
If you don't have a special pressure gauge, you can disconnect the filler hose from the machine, point it into a bucket and open the tap. A good jet pressure indicates normal pressure in the system. A weak stream indicates a problem with the plumbing or a blockage in the hose.
It is also important to inspect the inlet hose itself. It should not be twisted, crushed by heavy equipment or have creases. In systems with the function Aquastop the hose has a thickening at the base where the solenoid valve is located. Damage to this section requires replacement of the entire hose assembly, since it cannot be repaired.
Drainage errors and blockages in the drainage system
When the faucet is on, but there is water in the car and it does not drain, the problem lies in the drainage system. Dishwasher Bosch will not start a new wash cycle unless the tank is emptied of old water. The first element to check should always be the coarse filter located at the bottom of the washing chamber.
A clogged filter is the most common cause of drainage problems. Leftover food, fruit pits and fat can completely block the hole. It is necessary to unscrew the filter, rinse it under hot water using a brush and degreaser. Don't forget to check the drain hole under the filter, where small objects like toothpicks often get caught.
If the filter is clean, check the drain hose. It may be kinked, squashed, or clogged inside. Disconnect the hose from the sewer siphon and blow it out. It is also worth checking the connection height: the drain hose should rise to a height of 50-80 cm from the floor before entering the sewer so that dirty water from the sink does not flow back into the machine.
⚠️ Attention: Never leave the car with water inside for a long time. This can lead to unpleasant odors, bacterial growth and corrosion of metal parts.
The next candidate for inspection is the drainage pump (pump). If, after cleaning all the filters, the water does not drain away, and the pump hums but does not pump, the impeller may be jammed by a foreign object (a piece of glass, a bone). If the pump is silent, most likely the motor has burned out or there is a problem in the electronics.
Aquastop system and leaks into the pan
One of the most serious reasons for the faucet indicator to light up is the activation of the leakage protection system. Aquastop. At the bottom of the dishwasher Bosch there is a special pan in which the float is installed. If a microcrack or depressurization occurs in the system, water flows into this pan.
When the water level in the pan reaches a critical level, the float floats up and mechanically or electrically (via a microswitch) signals the control module about an accident. The machine immediately stops running, turns on the drain pump (to pump water out of the tank) and the faucet light comes on, often in combination with flashing.
Activation of Aquastop is a protective reaction of the machine to a real or false leak of water into the lower part of the body, requiring immediate intervention.
To reset the Aquastop error, it is not enough to simply turn the machine off and on. Required:
- 🛑 Completely disconnect the dishwasher by removing the plug from the outlet.
- 🔧 Carefully slide the car out of the niche and remove the lower decorative panel or lay the car on its side (being careful).
- 🧽 Wipe all the water from the pan dry with a rag and sponge.
- 🔄 Wait 10-15 minutes for the contacts to dry and turn on the power again.
If after these steps the error disappears, it means that the leak was a one-time occurrence (for example, overflowing due to an unsuitable detergent). If the faucet lights up again after some time, you need to look for the leak: check the door seals, the cuffs of the circulation pump and the hose connections inside the housing.
Malfunctions of sensors and electronic module
If mechanical causes are excluded, water flows in and out freely, and the faucet indicator continues to light, the problem may lie in the “brains” of the machine. The pressure sensor (pressostat) tells the control module how much water is in the tank. If it transmits incorrect data (for example, that the tank is empty when it is full, or vice versa), the wash cycle will not start.
Often the inlet solenoid valve itself fails. Even if voltage is applied to it, it may not open due to mechanical contamination or magnetic sticking. In such cases, replacement of the unit is required. It is also worth checking the integrity of the wiring going to the valve and pump: the contacts could be oxidized by moisture or chewed by rodents if the car was left idle for a long time.
Before replacing expensive sensors or a control module, try performing a hard reset. Leave the machine unplugged for 20-30 minutes. This will allow the capacitors to discharge and the electronics to reset, which sometimes eliminates software glitches.
In rare cases, the electronic control module itself is faulty. It could “glitch” due to a power surge or steam getting inside the case. Repairing the module requires professional diagnostics and soldering; at home, you can only check the fuses on the board.
Self-diagnosis algorithm
In order not to guess, but to act systematically, follow the step-by-step algorithm. First, exclude external factors: water pressure, position of hoses, availability of electricity. Then go to the internal audit: filters, drainage, presence of water in the pan. Only after this should you think about complex repairs.
Remember that regular maintenance extends the life of your equipment. Using special products to remove grease and scale from dishwashers helps maintain the flow of hoses and valves. It is also important to use high-quality tablets that dissolve completely without leaving sediment on the filters.
If you have checked all the points, but the problem is not solved, or if access to the components requires complete disassembly of the case, it is better to contact an authorized service center. Self-disassembly of complex equipment without skills can lead to damage to the plastic latches or failure of the tightness of the connections.
Why does the faucet light up immediately after turning it on, even before the wash starts?
This usually means that the control module did not receive a signal about normal pressure in the system during initial diagnostics or detected water in the sump (Aquastop). It is also possible that the water supply valve is stuck in the open position, causing the machine to “think” that there is an overflow.
Is it possible to use the dishwasher if the faucet is blinking?
It is not recommended to operate equipment with the error indicator on. This can lead to flooding of the kitchen, damage to the property of neighbors below and the final failure of electronics. The machine must be stopped, the cause of the error must be found and eliminated.
How to reset error E15 on a Bosch dishwasher?
Error E15 (Aquastop) is reset only after the leak has been repaired and water has been removed from the sump. Simply turning off the power will not help as the float remains in the up position. It is necessary to remove the bottom panel, wipe off the water, and only then the system will be unlocked.
What should I do if the error does not go away after cleaning the filter?
If the filter is clean, the problem may be in the drain pump, a kinked drain hose, or a clogged sewer pipe. Check if water flows freely from the hose when you lower it into a bucket. If the water doesn't drain well, clean the drain.