Control modules in automatic washing machines fail quite often. There can be many reasons for this. In 80% of cases, a defect appears in any part of the machine and this leads to the failure of the electronic module. But there are also other types of malfunctions. One of such cases is discussed in the article.
The washing machine Samsung WF-S861 2008 is under repair, the model is widespread and very reliable. The malfunction is as follows: the machine turns on, any washing program is selected, when "START" is pressed, the door lock is activated and water begins to collect.
Water fills the tank more than half and an error 4E is issued. This error indicates a malfunction of the water filling system, but as we observed earlier, water is supplied to the drum without any problems.
If there are no problems in the filling system, you need to check the water level control system in the tank. From the observations above, the conclusion suggests itself that the control module does not "see" the water. First of all, you need to check the hose of the pressure switch (water level sensor), for this you can remove it and blow it out, if nothing prevents the passage of air, everything is in order in this unit.
The next step is to check the performance of the pressure switch and the integrity of the wires that fit it. Only after making sure that the listed nodes are in good order, you need to look for the cause of the malfunction in the electronic module.
After dismantling the control module, you need to carefully check it for external defects. The practice of repairs shows that 50% of faults are detected at this stage.
Our case was no exception, when inspecting the control panel, traces of liquid and oxidation were noticed. The photo shows the oxidation of the wires of the connecting loops, most likely this led to the malfunction.
Then the most difficult part begins, in order to check the contact of the loops, you need to get to the inside of the main module board. For this, a soldering iron with a thin tip is melted through a window in plastic.
Carefully, so as not to damage the tracks on the board and not to rip off small elements, remove the silicone fill.
Next, you need to ring all the conductors of the loops with a multimeter. As a result of the continuity, it turned out that three conductors have great resistance due to destruction, as a result of corrosion. It is here that the cause of the malfunction is hidden. You can eliminate it by throwing other flexible wires in parallel or replacing the loops with new ones.