You started the wash, but instead of the usual cycle, the machine starts draining water immediately after washing - or even during it? This problem occurs in 15-20% of washing machines older than 5 years, but can also appear on new models. The most common culprits are faulty sensors, clogs, or software glitches. In 60% of cases, the breakdown can be fixed on your own without calling a technician.

In this article we will look at all possible reasons, through which the washing machine drains water when filling - from a banal filter blockage to serious damage to the control board. You will learn how to diagnose based on symptoms, what tools you will need for repairs, and receive step by step instructions for popular brands: LG, Samsung, Indesit, Bosch and Electrolux. We will pay special attention to models with the system AquaStop — they have specific nuances.

If your car not only drains water, but also doesn't heat it up, does not wring out or gives an error (for example, E18, 4E, F02), at the end of the article you will find a table of decoding codes for different manufacturers. We have also prepared FAQ block with answers to frequently asked questions: is it possible to wash with such a malfunction, how much will repairs cost at the service center, and how to temporarily bypass the problem.

1. Why does the washing machine drain water immediately after washing: the main reasons

Draining water while filling is always a signal of a malfunction. A normal wash cycle involves the machine first drawing water, then locking the door, heating the water (if the heated program is selected), and only then starting to wash. If draining starts ahead of time, the culprits may be:

  • 🔧 Faulty pressure switch (water level sensor) - the most common cause (40% of cases). The sensor mistakenly “thinks” that there is too much water and sends a command to drain.
  • 🚰 Clogged drain system - filter, pipe or pump. The water cannot circulate properly and the machine tries to “release” the tank.
  • 📱 Control board failure - especially relevant for electronically controlled cars (Samsung, LG). The settings may be lost or the microcircuits may be damaged.
  • 🔌 Problems with the water intake valve - if it does not close completely, water continues to flow, and the machine drains it to avoid overflow.
  • 🛠️ Faulty drain pump (pump) - can work continuously or turn on spontaneously.
  • 🔄 Software problems - especially after power surges or firmware updates.
  • 🚨 Activating the AquaStop system - in cars Bosch and Siemens Leakage protection is triggered and the water is drained in an emergency.

To accurately determine the cause, you need to analyze car behavior:

  • Drains water immediately after switching on → problem with the pressure switch or board.
  • Drains while typing → clogged or faulty valve.
  • Drains with an error on the display → see the code description (table below).
  • Drains no errors, but with pauses → firmware failure may occur.

Critical moment: if the machine drains water and an error appears on the display E18 (or similar), immediately unplug it! This may indicate a short circuit in the pump or circuit board.

2. How to diagnose the problem: step-by-step instructions

Before disassembling the machine, do primary diagnosis. It will help narrow down the range of possible causes and save time.

Check that the drain hose is connected correctly (there should be no kinks)

Run the machine in the "Rinse + Spin" mode - does it drain water in this mode as well?

Listen for any extraneous sounds when draining (hum, crackling, gurgling)

Check if the Aquastop indicator is on (for Bosch/Siemens machines)

Disconnect the machine from the network for 10 minutes, then turn it on again - will the error be reset?

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If the problem persists after resetting the power, go to deep diagnostics:

  1. Checking the pressure switch

    Unplug the machine. Remove the top cover (usually secured with 2 screws on the back). Find the pressure switch - this is a round part with a connected tube and wires. Carefully remove the tube and blow into it. If you hear clicks, the sensor is working. If not, replacement is required.

  2. Drain pump test

    Shine a flashlight at the bottom of the car (usually the right side). If debris is visible in the filter, clean it. To check the pump, run the drain program and listen: if the pump hums, but the water does not drain, there is a clog in the pipe or hose.

  3. Water intake valve diagnostics

    When the power is off, check to see if water is flowing from the hose. If yes, the valve does not close. You can also test it with a multimeter (the resistance should be 2-4 kOhm).

  4. Checking the control board

    If the previous steps do not work, inspect the board for swollen capacitors, oxidized contacts or traces of burning. In cars LG and Samsung The board often fails after power surges.

For machines with system AquaStop (Bosch, Siemens) there is a separate nuance: if the protection is triggered, there may be no error on the display, but the machine will drain the water immediately. To reset AquaStop, unplug the machine for 1 minute, then hold down the button Start/Pause 5 seconds.

LG

Samsung

Indesit

Bosch/Siemens

Electrolux

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3. Pressostat: how to check and replace

The pressure switch (water level sensor) is the “brain” that controls the amount of water in the tank. If it breaks down, the car can underfill, pour over or drain water spontaneously.

Signs of a malfunctioning pressure switch:

  • 💧 The machine takes in water, immediately drains it and fills it up again (the cycle repeats).
  • 🚿 Water is collected until it overflows (water flows from the hatch).
  • 🔄 An error flashes on the display E11, E13 or F04 (depending on the model).
  • 🔊 When the drum rotates, clicks are heard (this sensor works chaotically).

To check the pressure switch:

  1. Unplug the machine and drain the water through the emergency hose (usually located next to the filter).
  2. Remove the top cover by unscrewing the 2 screws at the back.
  3. Find the pressure switch (usually on the right or back, the tube from the tank goes to it).
  4. Pick up the tube and blow into it. A working sensor will make 1-3 clicks. If there are no clicks or they are too weak, the sensor is faulty.
  5. Test the contacts with a multimeter (the resistance should change when you blow into the tube).

If the pressure switch is faulty, it must be replaced. The cost of a new sensor is from 800 to 2500 rubles, depending on the model. To replace:

  1. Disconnect the tube and wires from the sensor.
  2. Unscrew the mounting screws (usually 1-2 pieces).
  3. Install a new pressure switch and connect everything in reverse order.
  4. Run a test wash without any laundry.
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If you are not sure about the model of the pressure switch, take a photo of the old sensor and show the photo to the salesperson at the spare parts store - this will help you choose the exact replacement.

4. Blockage in the drain system: cleaning the filter, pipe and pump

Blockage is the second most common cause of spontaneous drainage. Debris (coins, buttons, threads, hair) can block the normal circulation of water, and the machine “decides” that it urgently needs to drain the water to avoid overflowing.

The drain system needs to be cleaned at least once every 3 months, even if there are no visible problems. This is especially true for machines that wash things with pile (towels, blankets, carpets).

Step-by-step cleaning instructions:

  1. Cleaning the filter

    The filter is located at the bottom of the machine, under a small cover. Place a water container, unscrew the filter counterclockwise and remove all debris. Rinse the filter under running water.

  2. Checking the pipe

    Disconnect the pipe connecting the tank and the pump (you will need to unscrew the clamps). Check it for blockages. If the pipe is clogged, flush it or replace it.

  3. Pump diagnostics

    If after cleaning the filter the water still does not drain or drains jerkily, check the pump. To do this:

    • Remove the bottom panel of the machine.
    • Disconnect the wires from the pump.
    • Check the winding resistance with a multimeter (should be 150-200 Ohms).
    • If the pump does not work, replace it (cost: 1500-4000 rubles).

In cars Indesit and Ariston often clogs volute pump - a plastic part to which the pump is attached. If it is cracked or deformed, it needs to be replaced.

How to test a pump without a multimeter?

If you don’t have a multimeter, you can test the pump “by ear”:

1. Start the drain program.

2. Place your ear on the bottom of the machine.

3. A working pump emits a steady hum. If you hear clicks, crackles or hums, the pump is faulty.

5. Problems with the control board: diagnostics and repair

The control board (module, controller) is the “brain” of the washing machine. If it fails, the machine may behave unpredictably: drain water without a command, not heat it, block the door, or display errors.

Signs of a board malfunction:

  • 🔄 The machine turns on the drain immediately after switching on, even if the tank is empty.
  • 💻 appears on the display random errors (for example, E67, F11, HE).
  • 🔌 The machine does not respond to buttons or turns on every other time.
  • 🔥 Traces of burning, swollen capacitors or oxidized contacts on the board are visible.

Frequent causes of board failure:

  • ⚡ Power surges in the network (especially relevant for houses with old wiring).
  • 💦 Moisture getting on the contacts (due to leaks or high humidity in the bathroom).
  • 🔌 Short circuit in other components (for example, in a pump or heating element).
  • 🕒 Natural wear and tear (boards in cars over 7 years old fail in 30% of cases).

If you suspect the board is at fault, follow these steps:

  1. Unplug the machine and drain the water.
  2. Remove the top and back covers (on some models, you may also need to remove the front panel).
  3. Locate the circuit board - it is usually located on the top of the machine, under the control panel.
  4. Inspect the board for:
    • swollen capacitors (they look like barrels with a convex top);
    • blackened or burnt paths;
    • oxidized contacts (green coating).
  • If you see damage, the board needs to be repaired or replaced.

    • In 40% of cases the payment can be repair (replace capacitors, solder contacts). The cost of repairs is 1500-3000 rubles. Replacing the board will cost 4,000-8,000 rubles depending on the model.

    💡

    If the machine is under warranty, do not try to repair the board yourself! This will void the warranty. Contact the service center.

    Workaround: If the board burns out due to a power surge, you can try resetting it. To do this:

    1. Unplug the machine for 10-15 minutes.
    2. Press and hold the button Start/Pause 10 seconds.
    3. Plug in the machine and try to start the wash.

      4. 6. Repair features for different brands

      Each manufacturer has its own “diseases” and design nuances. Let's look at the most common problems for popular brands.

      Brand Typical reasons for water drainage when dialing How to fix Repair cost (independent/service)
      LG
      • Control board failure (often after power surges).
      • Clogged filter or pump volute.
      • Faulty pressure switch (especially in models with Direct Drive).
      1. Reset the board (disconnect for 10 minutes).
      2. Clean the filter and snail.
      3. Replace the pressure switch (part no. 6871ER1006A for most models).
      		 500-1500 / 2500-4000 rub.
      Samsung
      • Problems with the water level sensor (error 4E).
      • There is a blockage in the pipe between the tank and the pump.
      • Firmware failure (especially in models with Ecobubble).
      1. Reflash the board (you need a USB cable and software Samsung SW Update).
      2. Clean the pipe (in models WW65K42E00W it often becomes clogged with lint).
      3. Replace the pressure switch (part no. DC64-00019A).
      		 800-2000 / 3000-5000 rub.
      Indesit, Ariston
      • Cracked pump volute.
      • Faulty water intake valve.
      • Blockage in the system AquaControl.
      1. Replace the snail (part no. C00094700).
      2. Ring the valve (resistance 3.5 kOhm).
      3. Clear tube AquaControl (it goes from the pressure switch to the tank).
      		 400-1200 / 2000-3500 rub.
      Bosch, Siemens
      • Trigger AquaStop.
      • The relay on the board is faulty.
      • Blockage in the system EcoSilence Drive.
      1. Reset AquaStop (hold Start 5 sec).
      2. Replace the relay (part number 00646176).
      3. Clean the filter in the pump (in models with EcoSilence it is located non-standard).
      		 1000-2500 / 3500-6000 rub.

      For cars Electrolux and Zanussi typical problem with control unit EWM 1000. If the machine drains water and gives an error E20, most likely, a flashing or replacement of the unit is required. The cost of a new unit is about 5,000 rubles, but it can be found used for 1,500-2,000 rubles.

      7. Is it possible to temporarily use a machine with such a malfunction?

      Use a washing machine that drains water when it is filled, highly not recommended. Here's why:

      ⚠️ Attention! If the machine is draining water due to a faulty pressure switch or circuit board, it may pour water and cause a flood. In cars with the system AquaStop (Bosch, Siemens) when the protection is activated again, the water intake valve is blocked and the machine stops working completely.

      However, if you need to wash it urgently, but repairs are postponed, you can try temporary measures:

      • 🔄 Start the car in Quick wash or Rinse — in these programs, drainage occurs less frequently.
      • 💧 Reduce the amount of water manually (if there is an option Water level).
      • 🔌 Disconnect the machine from the network after each wash to reset possible board errors.
      • 🚿 Control the washing process and be ready at any time turn off the machine, if she starts draining water for no reason.

      If the machine drains water due to blockage, temporarily you can:

      • Clean the filter before each wash.
      • Use laundry bags for items with lint (towels, blankets) to reduce the amount of garbage.
      • Add to powder tray special tablets for cleaning washing machines (for example, Topperr 3004 or Sano AntiCalc).

      Important! These measures will not eliminate the problem, but will only delay it. The longer you delay repairs, the higher the risk serious damage (for example, combustion of a board or heating element).

      8. Common mistakes when doing DIY repairs

      Many people try to fix the washing machine with their own hands, but make mistakes that only aggravate the problem. Here are the most common:

      ⚠️ Attention! Never test the pressure switch by blowing into it with your mouth! Strong air flow can damage the sensor membrane. Use pump or compressor with pressure gauge (pressure no more than 0.5 atm).

      Top 5 repair mistakes:

      1. Not disconnected from the network

        Even if the machine is turned off with the button, voltage remains on the board. Always remove the plug from the outlet before disassembling!

      2. Using inappropriate tools

        Do not unscrew the clamps with pliers - this will deform the plastic parts. Use special clamp wrenches or a screwdriver with a thin blade.

      3. Incorrect assembly after cleaning

        If you forget to connect the tube to the pressure switch or do not secure the pipe tightly, the machine will give an error E11 or F04.

      4. Ignoring the error code

        Many people do not pay attention to errors on the display, although they directly indicate the problem. For example, E18 - this is a pump malfunction, and E67 - problem with the board.

      5. Attempting to repair a board without experience

        If you have never soldered before, do not try to change the capacitors on the board yourself. Contact a specialist.

      Another common mistake is use of non-original spare parts. For example, cheap Chinese pressure switches for LG often fail after 2-3 months. It is better to buy spare parts from official dealers or trusted suppliers (for example, 220Volt, AllSpare).

      If after repair the machine still drains water, check:

      • Are all tubes and wires connected correctly?
      • Is there any debris left in the pipes?
      • Is the pressure switch membrane damaged during installation?
      • Are the board settings lost (sometimes sensor calibration is required).

      If all else fails, the problem may be several faults at the same time (for example, blockage + board failure). In this case, it is better to contact the service.

      FAQ: Answers to frequently asked questions

      Is it possible to wash if the machine drains water when filling?

      Short term - yes, but with caution. Run only short programs (Quick wash, Rinse) and control the process. However, remember that this may lead to flood or board failure. We recommend that you fix the problem as soon as possible.

      How much does a service repair cost?

      The cost depends on the reason:

      • Cleaning the filter/pipe - 800-1500 rubles.
      • Replacement of the pressure switch - 1500-2500 rubles.
      • Board repair - 2000-4000 rubles.
      • Pump replacement - 2500-4500 rubles.
      • Diagnostics (if the cause is unclear) - 500-1000 rubles.

      In the regions, prices are 15-20% lower than in Moscow and St. Petersburg.

      The machine drains water and displays error E18. What to do?

      Error E18 (or 4E at Samsung) indicates drain problem. Most likely, the filter, pipe is clogged, or the pump is faulty. Actions:

      1. Clean the filter (bottom panel, right).
      2. Check whether the pump impeller rotates (if not, the pump is burnt out).
      3. If the error remains after cleaning, replace the pump.
      After replacing the pressure switch, the machine still drains water. What's the matter?

      Possible reasons:

      • The tube is not connected correctly to the pressure switch (check for leaks).
      • Control board failure (needs flashing or replacement).
      • There is a blockage in the drainage system (even after replacing the pressure switch, water does not circulate normally).
      • The water intake valve is faulty (it does not close and the machine drains the “extra” water).

      Check all components again or contact the service for comprehensive diagnostics.

      How can I prevent it from breaking again?

      To prevent the problem from returning:

      • Clean the filter once every 3 months.
      • Use mesh for water intake hose (protects against rust and debris).
      • Do not overload the machine (maximum 2/3 of the declared weight).
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