The situation when a washing machine does not drain water well is familiar to many owners of household appliances. After the cycle is completed, liquid remains in the tank, the laundry remains washed, and an error code lights up on the display. This doesn't always mean an expensive breakdown.
In most cases, the problem lies in banal blockages or kinks in communications. Drain system It is designed quite simply, and the initial diagnosis can be carried out independently, without calling a specialist. However, this symptom cannot be ignored, since water in the tank can lead to oxidation of the contacts and failure of the electronics.
Before disassembling the unit, it is necessary to understand the operating algorithm of the pump. If washing machine it hums, but does not pump water, or it works absolutely silently where the sound of the motor should be - these are two different scenarios. Further actions will depend on the nature of the sounds produced and the presence of foreign objects in the filter.
Primary diagnostics and error codes
Modern models, whether Bosch, LG or Samsung, equipped with a self-diagnosis system. If normal water exchange is disrupted, the controller records the time spent on pumping. If the water level does not drop to the desired level within the allotted period, the cycle is interrupted.
A specific code appears on the screen. For example, at Samsung this is often 5E or SE, y LG — OE, and Bosch and Siemens — E18 or F18. The decoding of these symbols directly indicates a problem with the drain. However, the error code does not always indicate a pump malfunction; he only states the fact that the water has not gone away.
It is important to listen to the operation of the device when attempting to drain. If a characteristic hum is heard, but the water stands still, it means pump motor is working properly and trying to work, but something is stopping it. A complete absence of sound may indicate an open circuit, burnt out windings, or a malfunction of the control module.
⚠️ Attention: Do not ignore repeated drain errors. Constant idling of the pump or attempts by the module to start a cycle can lead to overheating of the windings and final failure of the part.
The first step should always be a visual inspection of external communications. Users often forget to check whether the hose is pinched behind furniture or whether it is not lowered too low into the sewer pipe, which creates a siphon effect and reverse flow of water.
Cleaning the drain filter and removing debris
The most common reason why The washing machine does not drain water - this is a clogged filter element. It is located at the bottom of the front panel, hidden behind a decorative hatch or removable panel. This is where everything that is forgotten in your pockets ends up: coins, buttons, lint, threads and small debris.
To clean, you need to place a flat container to collect the remaining water, since when you unscrew the plug, it will inevitably spill out onto the floor. Unscrew the filter slowly, controlling the flow. A dense lump of hair and scale often forms inside the mesh, which completely blocks the passage opening.
After removing the filter, look inside the shaft. There may be a pump impeller there. Try gently twisting it with your finger or a screwdriver (with the power off!). It should rotate freely, without jamming or extraneous friction.
☑️ Cleaning the drain filter
If the impeller is difficult to rotate, there may be a small object stuck between the blades and the housing, such as a bra wire or a match. Such objects often block rotation, creating a situation where pump buzzes, but doesn't pump.
Checking the drain hose and sewer
If the filter is clean, attention turns to the drain hose. It can be bent or crushed by heavy equipment or furniture. This happens especially often when installing the machine in a niche or under a countertop. Check the entire hose path from the machine body to the point of entry into the sewer.
A blockage can also form in the hose itself, especially if it has not been changed for a long time and has a corrugated inner surface where dirt accumulates. To check, the hose must be disconnected from the sewer pipe and from the machine body (after turning off the water and turning off the electricity).
Blow out the hose or rinse it under strong water pressure. If water flows freely, the problem may be in the sink trap or sewer pipe. A clog in a public drain can create back pressure, preventing water from leaving the tank or even backing up.
When connecting the drain hose to the sewer, make sure that its bend is at a height of 60-80 cm from the floor. This will prevent spontaneous drainage of water during typing and washing.
Also check where the hose connects to the sewer system. Rubber seals and cuffs can become overgrown with fatty deposits, narrowing the passage. Using special pipe cleaners will help restore normal flow.
Diagnostics and replacement of the drain pump
When mechanical obstacles are excluded and the hoses are clean, the drain pump. This is a consumable material, the resource of which is usually 5-7 years of active use. Over time, the bushings wear out and the winding may burn out.
For diagnostics you will need a multimeter. After removing the pump, you need to “ring” the contacts of the motor winding. If the device shows an open circuit (infinite resistance) or a short circuit (close to zero), the part must be replaced. Normal resistance is usually in the range of 150-200 ohms, but the exact values vary by model.
A situation often occurs when the pump impeller is physically intact, but does not sit tightly on the motor shaft. During operation, the motor spins, but the blades stand still or slip. In this case, you can try to attach the impeller to heat-resistant glue, but it is safer to replace the entire assembly.
| Symptom | Probable Cause | Action |
|---|---|---|
| The pump is humming, but the water does not flow out | Impeller clogged or jammed | Cleaning the filter, checking rotation |
| Complete silence when draining | Open circuit or burned out winding | Continuity test with a multimeter, replacement |
| A cracking or grinding sound is heard | Destruction of bearings or bushings | Pump replacement |
| The water goes away slowly | Partial blockage or wear of the pump | Cleaning the system, checking pressure |
When choosing a new pump, pay attention not only to compatibility with the car model, but also to the mounting method and connector. Universal pumps often require adapters or housing modifications. Original spare parts Askoll, Plaset or Drainex last longer than cheap analogues.
Water level sensor malfunctions
Monitors the draining process and the liquid level in the tank pressure switch (water level sensor). If it transmits incorrect data to the control module, the machine may “think” that the tank is already empty and not turn on the pump, or vice versa, not see the water and not start draining.
Often the problem lies not in the sensor itself, but in the thin tube connecting it to the tank. It may become clogged with gel-like deposits from the powder or condensation. As a result, the air pressure in the system is not transmitted to the pressure switch membrane.
To check, remove the tube and blow it out. The sensor itself can be checked by blowing into it with your mouth (with the machine turned off) - clicks of the contacts should be heard. If there are no clicks or they occur randomly, the water level sensor is faulty and requires replacement.
How to check a pressure switch with a multimeter?
Switch the multimeter to dialing mode. Connect the probes to the sensor contacts. Blow into the sensor tube. When the pressure changes, the resistance should change, and the contacts should close/open with a characteristic click. If there are no changes, the sensor is faulty.
Incorrect operation of this element leads to washing machine behaves illogically: stops with the water, does not spin the laundry, or drains the water continuously during the set.
Problems with the electronic control module
The most difficult and expensive option is a malfunction of the control module. It is he who supplies voltage to the pump. If the pump control triac is broken or, conversely, does not open the circuit, the drain will not work.
Often traces of oxidation are visible on the board if the machine was parked in a damp room, or blackening from power surges. In some cases, it is enough to re-solder the burnt element or restore the tracks, but often it is necessary to replace the entire module or reflash it.
Diagnosing a board requires in-depth knowledge of electronics. Without experience, it is better not to climb inside the module, as you can damage other components. If all mechanical parts and sensors are working properly, but the pump does not receive power, the problem is in the “brains” of the machine.
Electronics diagnostics is the last stage of testing. First, rule out blockages, check the hoses and the pump itself, as they fail in 90% of cases.
Sometimes a glitch in the program can cause a false error. Try performing a hard reset or rebooting the machine by unplugging it for 15-20 minutes. This may help if the problem is software in nature.
Frequently asked questions (FAQ)
Why does the washing machine drain water during washing?
This phenomenon is called "gravity flow". Occurs if the drain hose is connected to the sewer too low (below 60 cm) without a special anti-siphon valve. Water is drawn into the machine by gravity, the machine adds new water, heats it up and drains it again until the time runs out or the protection is triggered.
Is it possible to start washing if the machine has not completely drained the water?
Strongly not recommended. Remaining water may overflow when filled again, and the level sensor may malfunction. In addition, mixing dirty water with new water will ruin the quality of the wash. The cause of the water must be eliminated before the next start.
How often should the drain filter be cleaned?
It is recommended to carry out preventive filter cleaning every 3-6 months, depending on the frequency of washing. If you have pets or frequently wash fuzzy items, check it more often. This will extend the life of the pump and prevent unpleasant odors.
What does the error mean if the machine drains water, but very slowly?
Slow drainage usually indicates a partial blockage (in the filter, hose or drain) or a worn-out pump that no longer develops the required pressure. It is also worth checking if there are any kinks in the hose that narrow the passage.