The problem when the Indesit IWUC 4105 washing machine stops draining water most often indicates a clogged filtration system or a failure of the drain pump. Owners of narrow models of the Smart series often encounter a similar problem after washing fleecy fabrics or small objects getting into the drum. If the cycle is completed and there is water in the tank, the first thing you need to do is check whether an error code, for example F05, is lit on the display, which directly indicates problems with liquid drainage. Ignoring this symptom can lead to more serious electronic failures or leaks, so you need to act quickly and consistently.
Primary diagnostics do not require complete disassembly of the unit. It is enough to visually assess the condition of the hose, make sure there are no kinks and check whether the drain in the sewer is blocked. Users often forget that the height of the drain hose connection must meet the technical requirements, otherwise a siphon effect may occur, preventing the pump from working.
The main reasons for stopping water drainage
The most common reason that Indesit IWUC 4105 does not pump out water, the pump impeller is mechanically blocked. Coins, buttons, bra wires, or lint may become stuck in the impeller, preventing it from rotating at the required speed. In such cases, the motor hums, but the water remains in place, or the electronics do not give a signal to start the engine at all due to increased resistance.
The second most common problem is the failure of the drain pump. The service life of the part is usually 5-7 years of active use, after which the windings may burn out or the bushings may wear out. If, when you turn on the drain mode, the pump is silent and does not make any sounds, most likely the problem lies in the electrical circuit or a burnt out motor.
⚠️ Attention: Before any manipulations with electrical components, be sure to unplug the washing machine. Working with moisture and electricity requires strict safety precautions.
It is also worth considering software failures of the control module. Sometimes the controller freezes and does not send a command to open the valve or start the pump. In this case, rebooting the system helps, but if the error persists, in-depth diagnostics are required.
Diagnosis of error codes on the display
Modern models Indesit equipped with a self-diagnosis system that displays alphanumeric indications of faults. For the IWUC 4105 model, the most relevant code is F05, signaling that the water level sensor (pressure switch) detects the presence of liquid in the tank after an attempt to drain. This means that the pumpdown command was given, but the result was not achieved.
Sometimes the error is not displayed immediately, but the end of wash indicator or the “Rinse” button flashes. In this case, it is necessary to decrypt the signal by referring to the instructions or code table. Misinterpretation of the code can lead to replacement of good parts, so it is important to determine exactly where in the cycle the failure occurred.
If the display shows other values, such as those related to temperature or sunroof locking, the problem may be complex. The control module may have received incorrect data from adjacent nodes, causing the program to crash.
| Error code | Description of the problem | Probable Cause |
|---|---|---|
| F05 | Drain malfunction | Filter clogged, pump failure |
| F06 | Button Error | Sticky panel keys |
| F07 | Heating error | Faulty heating element or relay |
| F09 | Memory error | Control module failure |
How to reset the error?
To reset the error on the Indesit IWUC 4105, try turning off the machine with the power button, then unplugging the plug from the outlet for 15-20 minutes. After turning on, start the “Drain” or “Spin” mode. If the error persists, hardware intervention is required.
Cleaning the drain filter and pipe
The first step in troubleshooting should be an inspection of the filter element. In the model Indesit IWUC 4105 it is located in the lower right part of the case behind the decorative panel. To access it, you need to pry off the plastic plug with a flat screwdriver or coin and unscrew the plug counterclockwise.
Before unscrewing the filter, prepare a low container for water and a rag, as residual liquid will inevitably flow out. If the plug does not unscrew, it may have become stuck or hit a foreign object. In this case, do not use excessive force so as not to break the thread, but try to gently rock the mechanism.
☑️ Checklist for cleaning the drain system
After removing the filter, carefully inspect the inside of the pump compartment. Sand, small debris and mucus often accumulate there. Clean the cavity with a sponge and check that the impeller rotates freely. If it is jammed, remove the stuck object with tweezers.
⚠️ Attention: Do not run the washing machine without the filter plug tightly screwed on. This will lead to leakage and possible flooding of the room.
Checking and replacing the drain pump
If mechanical cleaning does not help and Indesit IWUC 4105 still does not drain water, you need to check the pump’s functionality. To do this, you will need a multimeter and access to the internal components of the unit. Remove the top cover of the machine by unscrewing the two screws at the back and slide it back.
Locate the drain pump at the bottom of the housing. Disconnect the connector with wires from it and test the motor windings. Normal resistance is between 150 and 300 ohms. If the device shows an open circuit (infinity) or a short circuit (close to zero), the part must be replaced.
Replacing the pump on narrow models may be difficult due to limited space. Often you have to remove the front wall or even remove the tank for comfortable access. When installing a new part, make sure that the sealing rubber fits tightly to the body to avoid air leaks.
Tip: When replacing the pump, lubricate the O-ring with silicone grease. This will make installation easier and provide a better seal.
Diagnostics of pressure switch and control module
Sometimes the problem lies not in the pump itself, but in the water level sensor. Pressostat may get stuck in the “water present” position, even if the tank is empty. Check the tube from the tank to the sensor for blockages or kinks. Blow out the tube and wash the sensor itself.
If the electronics do not supply voltage to the pump, although it is working properly, the relay on the control board may have burned out. Visual inspection of the board may reveal blackened or swollen capacitors. Module repair requires qualifications and special equipment.
In rare cases, contacts in the wiring become oxidized. Check the integrity of the wires coming from the module to the pump and pressure switch. An open circuit interrupts the control circuit and the machine stops executing commands.
The main conclusion: 80% of drainage problems can be solved by cleaning the filter and checking the pump impeller. Do not rush to buy expensive spare parts before conducting basic diagnostics.
Prevention and operating rules
To avoid a repeat situation where Indesit IWUC 4105 does not drain water, follow simple operating rules. Regularly, once every 3-4 months, carry out preventative cleaning of the filter, even if there are no obvious signs of blockage. This will extend the life of the pump and prevent unpleasant odors.
Check clothing pockets carefully before loading. Small objects are the main enemies of the drain system. Using special bags for washing delicate items will also reduce the risk of lint and thread getting into the pump.
Pay attention to the length and position of the drain hose. It should not be twisted or lowered into the water of the sewer pipe below the level of 60 cm from the floor, unless a check valve is installed. Correct installation will ensure gravity flow and reduce the load on the pump.
Why does the car hum but not drain?
A humming sound indicates that the motor is receiving power, but something is preventing it from rotating. Most likely, a foreign object has gotten into the impeller or the pump bearing is jammed. Requires disassembly and cleaning.
Is it possible to drain water manually?
Yes, through the emergency drain hose (if included) or by carefully disconnecting the main drain hose from the sewer and lowering it into a basin. Be prepared for a lot of water.
How often should the drain pump be replaced?
The drain pump does not have a scheduled replacement period. It is replaced only when it fails. With careful use, it lasts 5-7 years or more.
What to do if the filter does not unscrew?
Don't use brute force. Try heating the plug with a hairdryer (carefully), using pliers through a rag, or contacting a service center to avoid damaging the tank body.