Do-it-yourself lg washing machine repair does not turn on

In detail: do-it-yourself lg washing machine repair is not included from the real wizard for the site my.housecope.com.

To repair a LG washing machine with your own hands, you need to know well the design features of the washing machine and its main faults that occur most often.

From time to time, many have a situation when the washing machine stops working normally. Modern units, including LG, have no problems with diagnostics and error detection. The fact is that the screen-display shows codes, each of which corresponds to a particular malfunction. LG washing machines have their own coding, deciphered in the attached technical documentation. It also provides practical advice on how to eliminate the resulting breakdowns.

Explanation of the main fault codes for LG washing machines:

Many problems that arise with LG washing machines can be solved independently, in accordance with the decoding of the codes displayed on the display. If the measures taken have not led to a positive result, it is recommended to perform a service test for a more complete diagnosis. Thanks to the information received, the repair of the washing machine can be done independently. Sometimes there are breakdowns that are not provided for by error codes. They also need to be able to identify and eliminate.

Sometimes the washing machine does not react in any way when the plug is plugged into the socket: the indicator lights do not light up, the musical greeting does not turn on. The reasons for this condition can be very different. Some can be easily removed on their own, while others - only in a service center.

Why the washing machine does not turn on:

Video (click to play).

Lack of electricity is the most common cause. For various reasons, an automatic machine or an RCD is triggered. Possible outlet malfunction.
Defective mains wire. The serviceability of the washing machine's power cord is checked using a multimeter. If a problem is found, the cord is completely replaced or repaired. All connections must be made only by soldering.
Malfunction of the power button, which receives power after connecting to the network. To check its performance, a tester is also used, set to the buzzer mode. The machine must be de-energized, and the button itself rings in both positions - on and off. If it is in working order, the multimeter will confirm this with a characteristic sound. If a malfunction is found, the button must be replaced.

Sometimes the LG washing machine will not turn on due to a malfunctioning noise filter (FPS). This device is designed to damp the electromagnetic waves emitted by the washing machine that interfere with the operation of other devices. When the FPS fails, it no longer passes electric current through the circuit, as a result, the washing machine does not turn on. Serviceability checks are carried out using a multimeter. It is necessary to ring the entrance and exit in turn. If there is voltage at the input, but there is no voltage at the output, then the FPS is faulty and needs to be replaced.

Sometimes the drum stops spinning in the LG washing machine. In this case, turn off the machine, drain the water, open the door and try to turn the drum manually. If the drum does not rotate, then it is jammed. This situation can arise for various reasons. For example, on LG top-loading washing machines, doors may open and catch on a heating element or other part.

Sometimes the drive belt jumps off, which has to be replaced along with the bearing. The bearings themselves fail due to wear of the oil seal, which allows air and water to pass through due to the loss of elasticity. A foreign object may enter between the tub and drum and prevent rotation.

When the drum is rotated by hand, but it does not rotate from the electric motor. The most likely reason is related to defects in the control modules. It is possible to solve the problem by resetting the program, but in more complex cases, the board needs to be repaired or completely replaced.

Another reason may be the failure of the drive belt, due to breaks or loosening. Sometimes the brushes of the electric motor fail, and the motor itself turns out to be faulty under the influence of water leaks or voltage drops. More precise reasons for the failure of drum rotation are established only after disassembling the washing machine and diagnostics.

After a certain time of operation, extraneous noises may appear in the LG washing machine, as well as uncharacteristic sounds in the form of a squeak, crackle and others. The main causes of extraneous sounds can be the following:

Quite often, situations arise when, while observing all the established norms, regarding the amount of laundry, washing powder and settings, water is still drawn into the tank too slowly or not at all.

In such situations, first of all, the presence of water in the system and its pressure, the position and serviceability of the valve for supplying water to the machine, as well as the condition of the water hose are checked. If everything is in order here, the washing machine must be freed from the laundry, disconnected from the power and diagnosed in order to identify malfunctions.

The main reasons for the slow water supply:

First of all, the correctness of the washing mode setting is checked. Some LG models have a no-drain mode option that may have been accidentally turned on. Next, the drain hose is inspected for kinks and blockages. If necessary, clean it, and at the same time check the siphon if water is drained through it.

The reason for not draining the water can be a filter that is dirty and clogged with various objects. Draining is significantly hampered or completely stopped. A clogged filter often leads to more serious damage to the unit, therefore it must be inspected and cleaned regularly. In addition, some small items of clothing can get stuck in the pipe, obstructing the escape of water.

A faulty pump, the sound of which becomes quieter in comparison with the usual mode, often becomes the cause of a violation of the drain. The machine makes a noise or hums, but the water does not drain. The malfunction occurs due to physical wear and tear of the pump, designed for 3-5 years of operation. Small objects leaking from the filter can jam the impeller.

Sometimes all systems work fine, but the water is still not drained. The main cause is a blockage in the drain hose, which must be removed and cleaned. The second reason is associated with a pump that has exhausted its resource and is able to rotate only without water, dry. When water is supplied, it jams, power is lost, and it stops rotating.

To avoid such situations, experts recommend taking a number of preventive measures:

Remove all foreign objects from pockets before washing.
The weight of the laundry loaded into the drum must strictly comply with the instructions, overloading is strictly not allowed.
Use only high-quality detergents in the right amount for washing.
We recommend using a stabilizer during washing. This will help keep your equipment safe from power surges and surges.

Water leakage in LG washing machines is one of the most serious malfunctions when you need to take the most urgent measures. Leaking water can not only flood the neighbors on the lower floor, but also damage the electronic parts of the unit.Therefore, if a leak is detected, the wash should be stopped immediately and the water drained. The water supply to the machine is completely shut off.

The main reasons for water leakage in LG washing machines are:

A leak near the filter indicates poor tightening after cleaning, damage to the O-ring or thread.
Water appears mainly in the front of the machine and often spills out through the doors. This becomes especially noticeable during the spinning process. The cause of the malfunction may be a loose door or a damaged hatch seal.
If a leak occurs while draining the water, the leaking drain hoses must be replaced.
Leakage can occur due to a rupture of the inner pipe, depressurization of the connections, or a defect in the water pump. In these cases, water comes out centrally under the washing machine or closer to the front of the washing machine. If a leak is found near the rear wall, it is likely that the bearing or the sealing gland will fail.
When the flow starts with the water supply, the problem may be in the powder tray, which is clogged with detergent residues. It is possible that the inlet hoses and water inlets are also clogged.

The most difficult part of the LG washing machine is undoubtedly the control module. In case of failure, the control panel stops the execution of all functions of the washing machine. After all, this unit turns on and off the device, organizes the direct washing process, selects the mode, provides rinsing and spinning, at its command, the water is heated and cooled.

Before you independently repair the control module, you must diagnose it. In case of obvious malfunctions, the machine does not spin the laundry normally, and the error code is not displayed on the display. The lamps located on the control panel at the same time or do not light up at all. Water is not drawn into the tank even if the required mode is set. The wash itself stretches for 3-4 hours in a row without stopping and switching to other modes. There are constant freezes of the device, there are difficulties with setting the necessary programs.

These and other signs gradually cause the complete inoperability of the washing machine. If at least one of them is available, the question of urgent repair of the control module should already be raised. Self-repair is recommended only to those people who have knowledge and experience with electronic circuits. In case of incorrect actions, the module will completely fail, and with it some components of the washing machine.

If, nevertheless, a decision is made to repair yourself, you must follow a certain procedure:

The module is cleaned of sealant.
It is then carefully removed from the compartment away from the transformer.
After removal from the electronic module, the remainder of the sealant is removed.
Further, repair work is carried out.
After repair, a protective varnish is applied to the board sections.

In some cases, the module is not completely removed, only the necessary area is cleaned from the sealant, which is then repaired.

Today, no one in the house can do without a washing assistant - she is used at least three times a week.

And each owner tries not to think about the upcoming breakdowns that may be caused by equipment that has been used for a long time or incorrectly.

What to do if the washing machine from the LG manufacturer stops responding to the washing programs you set, or does not turn on at all?

The moment you plugged the plug of the washing structure into the network, you could find that your washing machine did not show any natural signs of life (for example, the greeting melody did not play, or the indicator did not light up).

There are actually many reasons for this moment: from simple and rather mild breakdowns caused by the owner's indiscretion, to rather serious problems.

This is one of the most common reasons your LG washing machine may not start is due to the lack of electricity. The power supply may not be available in the following cases:

There was a power outage in your entire house, but you didn’t notice;
If you find a place where a wire breakage occurred, then you can try to do everything yourself with electrical tape or a soldering iron, but we do not recommend taking such actions, since this does not correspond to safety measures and will simply aggravate the position of the cord
There is a possibility of RCD operation, for example, when electrical energy has "leaked";
Perhaps your socket is burnt out. To find out for sure, just plug another device into this outlet, and if it works, then it is no longer a matter of the outlet.

The washing structure wire is broken

To test the power cord from your assistant, it is best to use a standard tester (multimeter), or, as a last resort, you can use an indicator screwdriver.

If your fears are confirmed, then we recommend replacing the cord completely. If you find a place where a wire breakage occurred, then you can try to do everything yourself with electrical tape or a soldering iron, but we do not recommend taking such actions, since this does not correspond to safety measures and will simply aggravate the position of the cord. Even if you fixed everything correctly, the problem will still not disappear, it will only go away for a while.

Power button malfunction

For a large number of washing units, after the moment the cord is plugged into the outlet, the power of the machine itself can come from the on / off button.

The power button can also be tested with a conventional tester. Set it to the buzzer (mode), disconnect the machine from the electricity, hold the button a little in two states - on and off. If the power button is operational, then the tester (multimeter) will give one of the characteristic sounds. If this does not happen, then you will need to replace the button.

This filter extinguishes all electromagnetic waves that have the ability to interfere with the operation of other devices in the vicinity. These can be appliances such as a dishwasher, TV, or microwave.

In such cases, if the filter breaks down, it stops passing electricity through the circuit, which forms a kind of problem when the washing machine is turned on.

First, you need to remove the top panel of the LG washing machine that is not working and find the FPS. At the input of the filter there are three wires, the first of which is ground, the rest are zero and phase (neutral), and at the output only neutral and phase.

If there is voltage at the input, but there is no voltage at the output, then we can assume that the problem is in this particular element, and it must be replaced.

We advise you to be very careful when checking the FPS.

Broken control module

If all the previous reasons were not found, then the breakdown may lie in the control module. We say in advance that if you have to change a module, then it is very expensive, and it is unlikely that replacing the module will ever be a justified decision.

However, some craftsmen have the ability to repair such an element, so to save all your resources, you just have to call them to your house.

Washing process mode does not startIt is not uncommon for you to plug the machine into the outlet, the indicator lights up, and the washing machine still does not work, whatever one may say.Broken UBL (door locking device) Door closing not recognizedFirst of all, make sure the door is firmly pressed against the hatch. If your door is unobstructed and tight Image - Do-it-yourself lg washing machine repair does not turn on

closes, then it is worth checking if it is blocked after starting the program.

If the blocker did not work, and the doors were not closed during the washing process, then this indicates that your blocker is defective. To find out exactly whether it is a blocker, you need to check this element with a tester.

If, at the start of the washing program, the current flows to the doors, but the blockage does not form, then there is a possibility that the door blocking device (UBL) has broken and it needs to be replaced.

At startup, the indicators "dance"

If you notice that when you turn on the idle LG washing machine into the outlet, all the indicator lights go crazy, blink in a scatter, or go out and light up together, then the problem is most likely in your wiring.

You should find the damaged area and replace it urgently.

As you may have already noticed, there are a lot of breakdowns to the LG washing machine.

Half can be formed due to our carelessness and carelessness, but there is an opportunity to correct them.

The rest can be repaired only with the help of a specialist, especially if you do not understand anything about electrical engineering at all.

Everyone knows that in order to turn on the LG washing machine, you first need to plug the power cord into the outlet, and then press the on / off button. The control panel will illuminate with all lights and the machine is ready to start the wash program. If the LG washing machine does not turn on, no matter how much you press the button, it means either a breakdown or a problem with the power supply. We have to check both that and another in order to discover the cause of this "disgrace".

Popular wisdom says: "if the washing machine behaves as if the electricity was turned off, it may be so." Of course, this is a joke, but still flip the switch in the bathroom, just in case, suddenly and really short-term shutdown. If electricity is supplied to your house properly, you may have to "dig" into the following possible causes of the malfunction:

the network wire is broken;
the outlet that powers the LG washing machine does not work;
FPS is out of order;

FPS on LG washers often burn due to power surges.

the on / off button does not function.

The control module or its individual semiconductor elements could, of course, completely burn out. But in this case, you will have to contact a specialist, since it is difficult to independently detect such a breakdown without special knowledge. So let's check with our own hands what we can and hope that the reason is simple.

So, by flipping the switch, you made sure that there is light in the house, which means that at the second stage you need to check the outlet to which the LG washing machine is connected. What to do? Look into the electrical panel and check if the machine that powers the outlet has been knocked out. Unplug the power cord of the washing machine and connect another electrical appliance to this outlet: kettle, table lamp, microwave. If the appliance works as if nothing had happened, then the LG washing machine is really faulty.

Power won't turn on? So the next in line for verification will be the power cord. Sometimes users manage to put something heavy on the power cord, perhaps even the LG washing machine itself. It's easy to guess what happens after that, the wire breaks through, and it stops feeding the equipment.

We take out the network cable to its full length and carefully inspect it. If there are burns or melting on the plug or any part of the wire, then the wire is most likely broken. But hidden breakdown is also possible. Take a multimeter, set it in ohmmeter mode for continuity and check the integrity of the wire. The defective wire will have to be replaced.

Let's assume that everything is fine with the mains wire. This means that the problem is hidden somewhere in the depths of the control block. To continue checking, we need to dismantle this block, and then disassemble. Let's get to work.

First you need to remove the cover from your LG washing machine.
Next, you need to take out the powder receptacle and put it aside.
We take a Phillips screwdriver in our hands and unscrew the screws, which are located next to the niche of the powder receiver on the right and left.
With the same screwdriver we press the latches of the control unit, after which we carefully separate the unit from the case.

Be careful with the bundle of wires that connects the case to the control panel

We will not remove the wires for now. But if during the check you need to completely separate the control unit from the case, then first take a picture of the location of the wires, so that later you can easily connect everything in place.

For now, let's remove the control unit, putting it to the side on top of the corner of the machine body. First you need to check and fix the breakage of the FPS, if any. At the top, under the housing cover, you can find a noise filter.

We call him with a multimeter. If the part does not ring, it must be replaced, if everything is in order with it, we return to the block. We disconnect the wires, and then we disassemble the block to get to the transformer. We check the tracks visually to make sure that the transformer is not unsoldered, and then we start calling it with a multimeter. They found a breakdown, which means that do-it-yourself repairs will consist either in soldering the tracks, or in replacing the transformer, nothing else can be done.

Your LG direct drive washing machine may stop turning on for another reason. Why? Because of the start button. Again, we take up the multimeter and call the contacts of this button, at the same time we check the start and on / off buttons. Having found a problem, grab the soldering iron, solder the tracks, remove the faulty buttons and solder new ones. At the end, connect the control unit and turn on the power, if the light is blinking, it means that the power is on and the machine will work.

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People are used to using the washing machine quite often, up to several times a week. We try not to think that such a technique can break down and let us down. But what if your LG washing machine suddenly stops responding or doesn't turn on at all?Plugging the power plug into the outlet, you find that your washing machine did not respond, the indicator light did not come on, and the welcome music did not play. There are many reasons why the washing machine does not turn on: from the banal imprudence of the user to serious breakdowns.Some of them can be corrected by yourself, while others - only with the help of a specialist. Image - Do-it-yourself lg washing machine repair does not turn on

The most common situation, due to which the unit may not start up, is the lack of electricity in the network. This may be due to the following events:

The electricity went off in the house, but you didn't notice.
The machine was knocked out due to an overload in the network or a short circuit.
An RCD has been triggered, for example, due to a power leak.
The socket is out of order. To eliminate this assumption, turn on another device in it. If it works, then this reason can be discarded immediately.

To check the working condition of the power cord from the appliance to the outlet, it is best to use a tester (with a multimeter). Similar manipulations can be performed using an indicator screwdriver. If the problem is confirmed, then the cord must be replaced completely. Or, having found the place of the gap, try to connect it with a special electrical tape or a soldering iron, which is actually wrong and dangerous, and will not solve the problem, but only delay it.

For most washing machines, after plugging them in, power is supplied to the on / off button. You can check the operating state of the button using a tester. After setting it to the buzzer mode and disconnecting the power to the machine, you need to ring the button in the on and off state. If it is working, then the multimeter will emit a characteristic sound. Otherwise, it will need to be replaced.

The noise filter dampens electromagnetic waves that can interfere with the operation of other devices in the vicinity. It can be a TV, dishwasher, microwave. In the event that a noise filter breaks down, then it stops passing electric current through the circuit, which results in a problem with turning on the washing machine.

To make sure that the FPS is working properly, you need to ring it with a multimeter.

To do this, you need to remove the top cover of the washing machine and find an interference filter under it. At the input, the FPS has three wires - ground (or ground), phase and zero (neutral); there are only two at the output - phase and neutral. In the event that there is voltage at the input, but at the output it is absent, therefore, the problem is in this particular part and it must be replaced.

Attention! When ringing the noise filter, be extremely careful.

If the reasons that were given were not confirmed, then the problem lies in the inoperative control module. Keep in mind that replacing this part is very costly an investment in the future of the washing machine, and not always justified. But experienced specialists in some cases can fix this part, it remains only to call the master to the house.

There are also cases when the indicator lights up when the appliance is turned on, but the wash does not start. If, when turned on, the washing machine informed about its operability by a lit indicator or a sound signal, but washing does not start when any mode is selected, then the problem lies in something below.

The first thing to do is to make sure that the hatch is really tightly closed. In the event that the door does not interfere, it is closed, you need to check if the door is locked after the program has been started. If the blocking has not occurred, then this indicates that the door blocker is faulty. To be sure of this to the end, you need to ring the mechanism.

If the door is energized at the start of the program, but the lock still does not occur, then the UBL (door lock device) is faulty and must be replaced.

If, after connecting the equipment to the network, you notice that all the indicators flash in a chaotic manner or go out together and light up in the same way, then the problem lies in the wiring. In this case, you need to find the problem area and replace it.

As you can see, there are many faults that can affect the performance of the washing machine, including turning it on.Most of them are caused by our indiscretion and carelessness, and they can be corrected on our own. Others, unambiguously, require the intervention of a master, especially if you do not have basic knowledge of electrical engineering. In any case, before turning on the washing machine, make sure that there are no electrical problems in the house, the water supply is in working order, and the hose is not pinched anywhere.

Can I repair my LG F-14A8FD washing machine with my own hands if it does not turn on? What do you think?It is forbidden to write answers that do not bring any benefit to the questioner from the series: “bring it to the service”, “contact the ASC”, “unprofitable”, etc. Answers like these will be considered a rating cheat, the answers will be deleted, and the account will be blocked.If you undertake to help people, answer fully. Explain why, if you recommend, for example, reflashing your phone, then write how to do it. If you write that repairs are unprofitable, explain why.One of the unpleasant moments that happens during the operation of the LG washing machine is the lack of reaction of the device to pressing the start button. Also, users often note that the unit is able to independently turn on or stop working after it starts. There are a sufficient number of factors due to which such malfunctions occur, while some breakdowns can be dealt with on their own.Owners of LG washing machines often speak well of the device, focusing on its reliability, durability and affordable cost. However, even the highest quality equipment also fails. On the forum, where malfunctions of washing machines of various brands are discussed, users of the LG unit often ask: why the LG washing machine does not turn on and what to do if the machine starts working by itself?Washing machine lg does not turn onThe fact that the washing machine does not turn on can be recognized by some signs:

after pressing the start button, everything remains unchanged;

after switching on, one indicator lights up or several blinks at the same time, but the device does not work.

Why doesn't the device turn on, refusing to perform its functions?The problem is provoked by a number of reasons:

lack of electricity;

malfunction of the network wire;

damage to the start button;

failure of the interference filter;

malfunction of the control module;

breakage of the door lock;

damage to the wires of the electrical circuit.

If the start button in the washing machine does not turn on as a result of serious breakdowns, it is better to entrust the repair of the device to a competent specialist.Among all the existing reasons that the LG washing machine does not turn on, the most likely is the lack of power supply.This happens due to:

power outages that can be overlooked;

power surges or short circuits;

residual current device (RCD) actuation;

damage to the outlet. To make sure it is working properly, you need to connect another electrical appliance. It is worth paying attention to how tightly the plug fits into the outlet. If it is there constantly, over time, the contacts of the outlet relax.

To understand why the LG washing machine does not turn on, you need to check the power cord with a tester. If there is any damage, it is better to purchase a new wire. Temporary use of a special tape or a soldering iron is allowed, although this option may lead to undesirable consequences.The start button is also checked with a multimeter, while the washing machine must be de-energized. The serviceability of the button is confirmed by a characteristic sound.To prevent nearby electrical appliances from interfering with the operation of the LG washing machine, it is equipped with a noise filter (FPS).Why won't the device turn on? Due to long-term operation, the filter simply does not cope with its tasks, therefore it does not allow electricity to pass through. To test the element, the top cover of the unit must be removed. If it needs replacement, you should act as carefully as possible.If a control module breaks down, you should refrain from trying to repair the part yourself. In this case, specialists should deal with the elimination of the malfunction, as they repeatedly say on the forums of users of the LG washing machine.From the video presented, you can learn how to proceed if the device does not want to work.Sometimes it happens that after turning on the device, the indicator lights up, but the wash does not start. The problem is explained by the presence of some reasons, which will not be difficult to identify.This is about:

Breakage of the hatch lock. First you need to make sure that the door closes tightly enough. If nothing prevents its closure, you need to check the functioning of the lock after starting the wash. Use a tester for accurate information. The broken element will need to be replaced.

Damaged wiring. When such a malfunction occurs, the indicators flash randomly or simultaneously light up and go out.

Replacing the washer door lockIn some cases, the owners of the LG washing machine have to look for the reasons why the LG washing machine turns on and off.Among the most common reasons are the following:

loading of things in excess of the norm;

incorrectly set operating mode;

incorrect distribution of the laundry in the drum.

Turning off the machine is also provoked by the failure of its parts - the engine, contacts, pump, door lock and others. It is better not to repair the device without the proper skills.To prevent the machine from turning on by itself, you must carefully study the instructions before using it. According to the manufacturer, if the LG washing machine itself turns on, it means that it is constantly connected to the mains. Many people do not remove the plug from the outlet after washing, so you shouldn't be surprised when your LG washing machine suddenly starts working on its own.

Surely many were in a bad situation, when a pile of dirty wash rags was already lying and ready to be put in the drum, the washing powder was poured, the fabric softener was poured, but the washing machine does not want to turn on. There are many reasons for this. Some of them can be easily fixed by repair, while others want the participation of a specialist. How to determine what is broken and what needs to be done? Let's figure it out with me.

My Indezit washing machine won't turn on. When I turn it on, the indicators do not respond to the buttons. After a few minutes, all indicators start flashing. It also does not respond to the power button. Launching programs has no effect when you hold it to reset programs.

I tried to do the following: I disconnected all terminals from the controller except the panel and buttons. So the problem remains. The containers on the controller are not externally swollen. I soldered one capacitor on a 330 uF pulse unit for a voltage of 25 volts. I checked the capacity with a device, normal readings. On the large board, another 470 uF capacitor for 25 volts was dropped, everything is also fine.

The tester checked the voltage of the output of the power supply unit on the board, it showed 12 volts. Then I measured the voltage at the input on the panel with buttons, it also turned out to be 12 V. So there is a desire to fix the washing machine, which does not turn on.

There is an opinion that the firmware of the washing machine unit may fly off.I checked the presence of liquid and traces of insects on the board, I did not find anything. There are small spots of blackness. There is no smell. The paths are also soot. After wiping with a cloth, I did not find any signs of damage on the parts and tracks.

When turned on and off, the module should respond without sensors. And they themselves light up, blink, do not react. The board does not need to be washed with alcohol, so that the dissolved dirt does not flow into other places.

Indicators with red arrows also blink.

It is necessary to determine the code by three flashing indicators. On the Internet, I did not find exactly how to decipher the code.

The product code and trade name are located behind the door on a sticker, on the back side where the filter is.

I show a sticker on the side of the hatch:

A friend advised me to look at the type of processor, find datashit in the technical description, and there you should see the pinout of the legs where the power is supplied. I looked in Yandex and Google for the name of the chip. Could not find. It is said that the Chinese make it to order for each model. Here I took a photo of the microchip:

Memory is written near the processor. It has eight legs. The memory and the processor have the same power supply. It can be measured on a microcircuit on the eighth leg. It equals 5 volts.

56 and 24 legs are a plus. What causes soot on boards? I rubbed the tracks, all the details are intact. There are black spots on the outside of the case. Could it be from the friction of the brushes, or from a module malfunction?

By code and firmware - this is Arcadia, made in Russia. We check from the side of the water heater circuits, there are relays, connectors and contacts. If necessary for checking, then we solder the parts, dry and clean. But, you can go the opposite way: check the heater, wires, contacts on the board. Next, walk to the relay.

Here are the relay and heater contacts:

With a multimeter, I checked the electric heating element for a break. It turned out to be serviceable. The supply wires from it also showed normal results. Now I will ring the path from the connector to the relay. Then I will ring the relay, it can drop out better, since the protective diode will deteriorate.

When measuring, if the resistance along the tracks is less than 1 Ohm, then we do not pay attention. If the resistance on the contacts is below 1 Ohm, do not look at it either. When measuring, take into account the wire resistance of the multimeter. Measured: at all places the resistance is higher than 1 mOhm. In one place, it only shows zero. I will solder the relay with a soldering iron. Although there should not be 1 mOhm, the tracks should ring to zero, the pins should also be zero. The relay has dropped out, let's see what the test gives.