Your dishwasher Bosch suddenly started to buzz loudly, and the faucet indicator (plumbing icon) on the control panel lights up or flashes? This combination of symptoms indicates problems with the water supply or drainage system. In 80% of cases, the malfunction can be fixed on your own without calling a technician - the main thing is to correctly diagnose the cause.

Noise in the dishwasher never just appears. It may indicate an overloaded pump, clogged filters, or even a broken valve. And the burning faucet indicator is a direct signal from the electronic control unit that the machine cannot draw or drain water normally. In this article, we will analyze all the possible causes of such a malfunction, from the trivial (forgot to open the tap) to the serious (failure of the flow sensor).

Features of the models Bosch (series SMV, SMS, SPV) is that they are equipped with a system AquaStop — if there is a leak somewhere, the machine automatically blocks the water supply and turns on the emergency indicator. But sometimes there are false alarms due to sensor failure. How to distinguish a real breakdown from a software glitch - read on.

1. Why the faucet light is on: 4 main reasons

Water tap indicator on control panel Bosch lights up in three situations:

  • 🚰 No water supply — the tap is closed, the pressure is low or the hose is clogged.
  • 🔧 Inlet valve faulty - does not open or is jammed.
  • 💧 AquaStop protection has activated — a leak in the system or a false alarm.
  • 📱 Program crash — controller error (often after a power surge).

The first thing to do is check the obvious:

  1. Make sure water supply tap under the sink is open.
  2. Check if it is kinked inlet hose (sometimes it breaks behind the machine leg).
  3. Open the tap on the mixer - if the water flows poorly, the problem is in the plumbing, not in the dishwasher.

If everything is in order with the water supply, but the indicator remains on, proceed to diagnostics of the valve and system AquaStop. In models Bosch Serie 6 and above, when there is a leak, the machine not only lights up the light, but also blocks the launch of programs - this is a normal protection reaction.

📊 How often do you clean your dishwasher filters?
Once a month
Once every 3 months
Only when problems arise
Never cleaned

2. Noise in the dishwasher: where does the noise come from and how to eliminate it

Loud hum or vibration in Bosch usually associated with:

  • 🌀 Circulation pump - if it is worn out or clogged.
  • 🚿 Drain pump - if foreign objects (bones, glass fragments) get in contact.
  • 🔊 Engine bearings - wear or lack of lubrication.
  • 💦 Vortex flows of water - if the spray nozzles are clogged.

To localize the source of noise:

  1. Run the program Rinse (without dishes) - if a hum appears when water is drawn, the problem is intake valve.
  2. If noise occurs during washing, check circulation pump and filters.
  3. Noise when draining? So it's clogged drain pump or pipe.

Critical point: if the hum is accompanied by knocking or grinding, turn off the machine immediately - this is a sign that solid objects have entered the pump, which can lead to damage to the impeller.

Check the water pressure in the tap|Inspect the inlet hose for kinks|Run a test program without dishes|Listen to the machine at different stages of the wash-->

3. How to reset a faucet error: step-by-step instructions

If the faucet indicator is constantly on or flashing, try resetting the error:

  1. Turn off the dishwasher using the button On/Off.
  2. Unplug it from the mains (pull out the plug from the socket) to 5–10 minutes.
  3. Check that the water supply valve is open and the hose is not kinked.
  4. Turn the machine back on and run the program Quick wash.

If the indicator lights up again after a reset:

  • 🔧 In models with a display (for example, Bosch SMV68TX06R) an error code may appear - write it down for diagnostic purposes.
  • 💡 In cars without a screen, the faucet light blinks 3 times in a row usually means a problem with the flow sensor.

To reset AquaStop (if leakage protection is triggered):

  1. Turn off the water supply tap.
  2. Disconnect the inlet hose from the machine.
  3. Wait 1-2 minutes and reconnect the hose.
  4. Open the faucet and turn on the dishwasher.
What to do if the reset didn't help?

If after all the manipulations the faucet indicator continues to light, the problem may lie in a malfunction:

- Solenoid valve (does not open or is stuck)

- Flow sensor (gives a false signal about lack of water)

- Control unit (firmware failure)

In this case, you will need to replace the part or reflash the controller at a service center.

4. Clogged filters and hoses: how to clean them yourself

In 60% of cases, faucet noise and error occur due to blockages. In the dishwasher Bosch yes 3 critical filters, which need to be checked:

  1. Coarse filter — located at the inlet of the inlet hose (mesh at the connection to the water supply).
  2. Fine filter — inside the car, under the lower sprinkler.
  3. Drain filter — located in the lower part of the body, under the mesh.

How to clean:

  1. Unplug the machine and turn off the water.
  2. To access the filters, remove the lower basket and unscrew the round cap at the bottom (turn counterclockwise).
  3. Rinse the filters under running water to remove any remaining food and grease.
  4. Check the drain pump hole for foreign objects (use a flashlight).

If there is a blockage in inlet hose:

  • Disconnect the hose from the machine and water supply.
  • Blow it out or rinse it under pressure.
  • Check the mesh at the entrance to the car - it often becomes clogged with rust.
Type of blockage Signs How to fix
Coarse filter Weak water pressure, the machine takes a long time to fill with water Clean the mesh at the hose inlet
Fine filter Noise when washing, poor wash quality Remove and rinse under water
Drain filter The machine does not drain water, it buzzes when draining Remove debris, check pump
Inlet hose No water flowing, faucet indicator blinks Blow out or replace the hose
💡

After cleaning the filters, run the program Intensive wash with the addition of a special dishwasher cleaner (for example, Somat Machine Cleaner) - this will remove any remaining grease and plaque in the system.

5. Pump problems: when repair or replacement is required

If the hum does not go away after cleaning the filters, the problem may be in the pumps. In the dishwasher Bosch there are two of them:

  • 🔄 Circulation pump — drives water through the system during washing.
  • 🚿 Drain pump — pumps out water after the program ends.

Signs of pump failure:

  • 🔊 Constant hum even when the machine is not washing.
  • 💦 Water does not drain or takes too long to drain.
  • 🌀 Body vibration at work.
  • 🚨 Error E24 or E25 on the display (in models with a screen).

How to check the pump:

  1. Drain the water from the machine (tilt it back with a basin).
  2. Remove the bottom panel (unscrew the screws or latches).
  3. Check the pump impeller for debris (bones, splinters).
  4. Turn the impeller by hand - it should rotate freely, without jamming.

If the pump is faulty:

  • 🔧 In models Bosch Serie 4 and Serie 6 the pump can be replaced independently (part cost ~2500–4000 RUR).
  • 🛠️ In premium cars (Serie 8) it is better to contact the service - they use more complex nodes.
💡

If, when checking the pump, you find that the impeller is broken or the motor does not rotate, do not try to repair it - the pump can only be completely replaced.

6. Malfunctions of the valve and AquaStop system

Intake valve and system AquaStop - weak points of dishwashers Bosch. If the faucet light is on and water is not drawn, one of these elements is to blame:

Inlet valve:

  • 🔌 Doesn't open — no signal from the control unit.
  • 🧲 Magnet stuck — the valve remains closed.
  • 💧 Valve filter clogged — the water doesn’t pass through.

AquaStop system:

  • 🚨 False positive — the leakage sensor tripped for no reason.
  • 💦 Real leak — the hose or pipe is damaged.
  • 📉 Membrane wear - in old cars (over 5 years old).

How to check the valve:

  1. Unplug the machine.
  2. Remove the top cover (unscrew the screws at the back).
  3. Find the valve (usually at the top right, the inlet hose goes to it).
  4. Check the winding resistance with a multimeter - it should be 2–4 kOhm.

If the valve is faulty, it must be replaced. The cost of a new one is from 1500 to 3500 ₽ depending on the model. For replacement AquaStop It’s better to call a technician, as the control unit needs to be re-flashed.

⚠️ Attention: If after replacing the valve the machine still does not draw water, check water pressure — Bosch requires a minimum 1 bar. If the pressure is low, the valve will not open and the faucet indicator will remain on.

7. When to call a repairman: 5 signs of a serious breakdown

Not all problems can be fixed on your own. Contact the service center if:

  • 🔥 The faucet indicator is on, but no water is drawn. even after replacing the valve and cleaning the filters.
  • 💻 The machine displays error E15, E22 or E27 - these are problems with the control unit.
  • 🔌 After switching on, the RCD is triggered - Possible current leakage.
  • 💦 There is a puddle of water under the car, but AquaStop didn't work.
  • 🔊 The hum is accompanied by smoke or a burning smell — the pump motor burned out.

Average cost of repairs in service:

Breakdown Cost of work (₽) Cost of spare parts (₽)
Intake Valve Replacement 1500–2500 1500–3500
Replacing the circulation pump 2000–3500 3000–6000
Control unit repair 3000–5000 5000–12000
Replacing the AquaStop system 2500–4000 4000–8000

If your dishwasher Bosch is under warranty, do not disassemble it yourself - this will lead to loss of warranty. At service centers BSH (official distributor Bosch) diagnostics are free if the car is under warranty.

⚠️ Attention: When contacting the service, check if they have original spare parts for your model. Some workshops install universal valves, which last 2–3 times less than the original valves.

FAQ: Frequently asked questions about malfunctions of Bosch dishwashers

🔹 Why does the Bosch dishwasher hum, but does not draw water?

This is a typical sign faulty intake valve or coarse filter clogged. Check:

  1. Is the water supply tap open?
  2. Is the inlet hose kinked?
  3. Keep the mesh at the entrance to the car clean.
  4. Valve serviceability (check with a multimeter).

If the valve is working, but no water flows, the problem is control unit or flow sensor.

🔹 What to do if the faucet indicator is on and the start button is flashing?

This combination usually means program crash or problem with water level sensor. Try:

  1. Unplug the machine for 10 minutes (error reset).
  2. Run test program (press and hold Start 3 seconds).
  3. If it doesn't help, check pressure switch (water level sensor).
🔹 Is it possible to use a dishwasher if it hums but washes normally?

If the hum is not accompanied by other symptoms (does not drain water, does not heat, does not display an error), then short term you can use it. But you cannot ignore the problem - over time this will lead to:

  • Pump bearing failure.
  • Engine overheating.
  • Water leakage due to vibration.

The optimal solution is diagnose the source of the hum (most often this is a blockage or wear of the impeller).

🔹 How often should filters be cleaned to avoid breakdowns?

The manufacturer recommends cleaning the filters every month, but in practice the frequency depends on the intensity of use:

  • 1–2 times a month - if you wash 3-4 times a week.
  • Every 3 months - if you use the machine 1-2 times a week.

Use special Dishwasher cleaners (for example, Finish Machine Cleaner) once every 2-3 months - this removes fat and plaque in hard-to-reach places.

🔹 How much does it cost to repair a Bosch dishwasher?

The cost depends on the breakdown and model:

Type of repair Cost (₽)
Diagnostics 500–1500 (free under warranty)
Valve replacement 3000–6000
Pump repair 4000–8000
Replacing the control unit 8000–15000

In the regions, prices can be 15–20% lower than in Moscow. Always check whether the cost of spare parts is included in the price of repairs.