Why does the Bosch washing machine not heat the water when washing? How to fix the problem?

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As practice shows, the main reason for insufficient heating is scale on the electric heater due to poor quality and hardness of the water. In good condition, washing machines can heat water up to + 95°C, but sometimes users notice problems with heating. Moreover, the BOSCH washing machine can behave differently: stop after 10-15 minutes or continue to work in “cold” mode. The latter is typical for old-style washing machines. To begin with, it is better to check whether there really are problems or whether these are subjective sensations.

1. Touch the hatch. After rinsing and drying, the laundry will be cold, so this should not be misleading. Therefore, to check, you need to touch the hatch 20-30 minutes after the start of the cycle. The hatch glass of a BOSCH washing machine should be warm and even hot, so be careful!
2. Check connection. The washing machine should cycle through and drain water at regular intervals that depend on the program setting. If the washing machine constantly takes in water and drains it, then it simply does not have time to heat up. This happens when the connection to the sewer is incorrect, so you need to check the installation.
3. Set the correct mode. It is possible that after a delicate wash performed at +30°C, the mode was not changed. For certain models of BOSCH washing machines, the program and temperature are selected using different switches. The water will not heat up if, for example, the temperature mode is +95°C, but the program is set to +60°C. The machine will be guided by the program.

Causes of Heating Problems

If you suspect that your Bosch washing machine is not heating the water, you need to make sure of this.

If there are problems with heating, various options for the behavior of the equipment are possible - continuing to run the cycle in cold water or stopping with an error code. It could be F19 or F22.

If the Bosch washing machine continues to operate until the end of the program without displaying an error message, you need to make sure that there really is no heating.

You can do it this way:

1. 
   Select a program with water heating.

2. Start the work cycle.
3. After 10-15 minutes from the start, touch the glass of the hatch with your hand.
4. If the glass is warm, then the heating is fine.
5. If the glass is cold, you need to double-check that the settings are correct.
   Some programs do not require heating or wash clothes at a minimum temperature of 30ºC, which is practically not felt as heating.

In the case when heating does not really start, you need to move on to analyzing the condition of the Bosch washing machine. There is a possibility that heating does not start due to the fact that the washing machine is constantly filling and draining water.

This can happen if the Bosch machine is installed incorrectly, when the drain hose simply lies on the floor and does not have the necessary rise above the level of the tank. The solution to the problem is to install the equipment in accordance with the manufacturer's recommendations .

Dismantling the heating element

Replacing a heater is not as simple as it seems at first glance. But if you have the skill, you can do it yourself.

To do this you will need the following tools:

• socket wrench;
• one or two slotted screwdrivers.

Before you start, you need to reset all contacts:

• two power;
• grounding;
• chip on the sensor.

Taking out the water heater

Then unscrew the screw, but not all the way. It is important! There is only one, so it is impossible to mix them up. Then you need to press the end with force using some kind of device. The screw should go inside and thereby release the heater mount.

After this, use screwdrivers to pry the edges of the heating element, pulling it away from the body. Here you need to use both force and accuracy so as not to damage the tank. Most modern washing machines have plastic. To replace, you need to purchase a heater of appropriate power (1700-2200 Watt) and size.

Video

Let us immediately note that this breakdown is typical for all SMA brands, for example, such as: “Samsung”, “Lji”, “Bosch”, Electrolux, “Zanussi”, Ariston, “Indesit”, “Virpull”, “Kandy”, “ Hans", Gorenje, "Ardo", "Beko", AEG, "Miele", "Siemens", "Kaiser" and "Atlant".

Diagnostics of a Bosch washing machine, troubleshooting methods

Lack of heating when choosing the correct Bosch program and settings always indicates a breakdown. To clarify the condition of the components, the washing machine will need to be partially disassembled. But first you need to disconnect the device from communications: be sure to unplug the plug from the socket and close the tap that supplies water to the washing machine.

The heating element burned out

Failure of the heating element is the most common error according to statistics , which leads to problems with heating water. The tubular electric heating element is located under the drum of the Bosch washing machine. The unit is accessible with the front panel removed.

To analyze the condition of the part, a multimeter is used and a visual inspection is carried out. The part that has become unusable is replaced with a new one. Details are in this article.

How to replace the heating element - on video:

Thermostat failure

If the temperature sensor fails, the Bosch washing machine cannot determine whether heating has occurred or not. The temperature sensor is located on the heating element. The functionality of the element is checked with a multimeter. The broken part needs to be replaced .

Failures in the control module

The control unit controls the operation of the Bosch washing machine and coordinates the switching on of the units.

If certain elements on the board burn out, signals related to water heating are not received or received. As a result, no heating occurs.

The solution to the problem is to repair the module . It is accessible with the top cover and top control panel removed.

Repairing the control module is a complex task that requires knowledge in electronics and special equipment, so it is better to entrust it to a specialist.

Wiring violations

In a Bosch washing machine, the main components are connected by electrical wires, through which signals pass from and to the control unit. If contacts are broken, wires or the entire loop are broken, information stops passing through. Such a breakdown can lead to a lack of water heating, as well as other failures.

The solution to the problem is to replace the wiring, twist it, and secure the contacts. Work of this nature is carried out with the washing machine body disassembled.

Water level sensor

If the water in a Bosch machine does not heat up, then one of the possible reasons may be a breakdown of the water level sensor . This element of the washing machine is not directly connected with heating, but if it fails, the water may not heat up.

Where to find the sensor and how to remove it - in the video:

Reasons for failure of popular brands

In addition to technical reasons, each product model of the machine has its own design nuances, the failure of which can lead to breakdown:

• Bosh machine. The weak point in the German Bosh, Whirlpool and Miele machines may be the water heating level sensor. During the washing process, the tube of the device very often becomes clogged with lint or wool. This negatively affects the functioning of the level relay and control module. The latter does not signal that the required water level has been reached and does not turn on the heating element for further heating. You can clean the sensor tube yourself, but in this case a specialist will be able to carry out a preventive inspection and prevent other breakdowns.
• Indesit machine. The Italian manufacturer tried to adapt its equipment for Russian users. That is why the Indesit brand washing machine has a standard design that does not create any special problems during use.
• LG washing machine. The not-so-high quality of the parts of the LG model means that regular washing can be carried out only at low temperature conditions, otherwise frequent temperature changes during heating and cooling will disrupt the operation of the heating element. The user must use a gentle temperature regime that does not exceed 60 degrees Celsius.
• Ardo technology. Everyone knows that the quality of drinking water in Russia is much worse than in European regions. Of course, this negatively affects the service life of Ardo household appliances from Italian manufacturers, which are designed for milder operating conditions. In addition to strong water hardness, the operation of the heating element is negatively affected by sudden voltage surges and exposure to low-quality washing powders.
• Samung machines are considered to be of average quality. At the same time, they are protected from significant damage and have both strengths and weaknesses. As with any similar technology, some difficulties may arise in the operation of Samsung. Most often, failures are associated with: Physical wear and tear of components made of plastic or rubber - such materials are susceptible to moisture and sudden temperature changes, which leads to malfunctions of the washing machine;
• Impaired sealing of hatches - with frequent use, it may begin to open or close poorly;
• Failures in electronics - if sudden changes in voltage levels occur, the washing machine may fail, and a message about a characteristic error will appear on the display. You should not troubleshoot such problems yourself.

Possible difficulties

If there is no water heating, and searching for a solution to the problem, you may encounter certain difficulties:

Wiring

Wires can burn out under increased loads, or burst at bends or in contact groups. If they are damaged, either the module does not receive information about the water temperature, because voltage is not supplied to the heating element.

Using a tester, you need to identify the break and replace the faulty wire.

Wires in the washing machine

Call the master

It is not always possible to determine the cause of the failure and repair a Bosch washing machine on your own. If you have doubts that you can do everything yourself, it is better to contact a household appliance repair company .

Such companies are present in every city. Information about them can be found on the Internet, where you can read reviews, study the price list and list of services.

The cost of work may vary between individual companies. The average prices for Bosch repairs in the capital of the Russian Federation are as follows:

• replacement of heating elements - from 1,700 rubles;
• repair of the control module – from 2500 rubles;
• wiring repair – from 1500 rubles.

The price of new parts for a Bosch washing machine is paid by the customer and is not included in the cost of work.

How to wash without repair

In the event that you don’t have time to repair a Bosch machine, but you need to wash the accumulated mountain of laundry now, we offer an original way out of the situation. Let’s immediately make a reservation that it is better not to use a faulty machine for a long time and to repair it at the first opportunity. So, how to wash clothes efficiently if the machine refuses to heat the water?

1. First, we decide at what temperature we will wash things. We set the specified temperature on the home water heater (for example, 600C) and wait until the water heats up.
2. We approach the washing machine and turn off the cold water supply to it. We open the powder receptacle, pour powder into it and insert the shower head into it.
3. We put dirty laundry into the drum of the washing machine, close the hatch door, turn on the machine and set the washing program.
4. We immediately turn on the hot water, which begins to flow through the shower head into the powder receptacle, washing the powder into the washing machine tank.
5. We wait until the water fills and observe the behavior of the washing machine. As soon as there is enough water, the machine will start washing, at this time we must turn off the hot water, remove the shower head from the tray and push the powder receptacle into place.
6. We open the previously shut off cold water tap and you can safely leave the bathroom. Then the washing machine will finish the wash itself, drain the soapy water, pump in rinse water, rinse the laundry, and then spin it. All this will be done without your participation.

As you have already noticed, this method is suitable not only for those who have hot water. If you only have cold water supply in your house, you can heat two buckets of hot water and gradually pour this water through the powder receiver into the washing machine tank. The effect will be exactly the same.

Interesting:

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• Electrolux washing machine does not heat water
• How to repair a Bosch washing machine
• Review of built-in dishwashers Bosch 45 cm
• Review of built-in dishwashers Bosch 60 cm
• Where are Bosch washing machines assembled?

3 reader comments

1. 07/21/2020 at 19:51

   Sasha:

   “If there is no blockage, you need to check the resistance of the pressure switch coil.” That's all? Where is the description of the test? What is the coil resistance?

   Answer

   02/01/2021 at 07:39

   Vladimir:

   How to check the pressure switch, how does it affect the on/off of the heating element?

   Answer

2. 02/03/2021 at 11:05

   Anonymous:

   The pressure switch basically only has contacts! Yes, there are also electronic ones, but you can’t just check them.

   Answer

Wrong program selected

The most common problem why a Bosch machine may not heat the water is the wrong choice of washing program. Bosch machines, as well as other household appliances of this type, have several washing programs in which the water is heated to different temperatures, depending on the selected mode. If it seems that the device has stopped heating water, it is recommended to check the selected mode.

In some models, it is possible to independently set the process temperature. Check if the temperature you set is suitable for you. It is worth noting that each program has its own maximum permissible temperature mode, which cannot be exceeded, even by setting the indicators manually.

Electronic "brain"

Having checked the heating element, thermistor, their wiring and the liquid level sensor, and without identifying any breakdowns, we can assume that the reason lies in a damaged control board. There are probably problems with the electronics.

It is impossible to accurately determine the nature of damage to the control module without diagnostics. The problem may be a loose contact, a burnt out tire or track. Perhaps the firmware has crashed, and a simple reboot of the washing machine and resetting all parameters will help correct the situation.

Comprehensive control board testing should be performed by professionals.

Such complex work must be entrusted to specialists. It’s better not to get into the “brain” of the machine without the necessary knowledge and experience. Otherwise, you can only aggravate the situation, further damaging the microprocessor. Then the repair will definitely cost a pretty penny.

The cost of a complete diagnosis of the electronic unit is low. Based on the results of the inspection, the technician will tell you whether the board can be repaired or whether a part needs to be replaced. Usually the modules are successfully repaired, so there is no need to worry ahead of time.

Possible causes and solutions

Temperature and washing program settings are incorrectly set

The value set by the temperature regulator does not correspond to the selected washing mode

Switch the temperature and washing mode controls to the appropriate positions according to the instructions

Self-draining of hot water due to the siphon effect as a result of improper connection of the machine to the sewer system

The drain hose remains constantly warm or hot during operation

Eliminate the siphon effect by connecting the drain hose correctly. If necessary, install a check valve in the drain system.

The wires or their insulation are damaged, the connecting contacts are oxidized

Conduct a visual inspection of the electrical wiring and contacts, check for open circuits and short circuits with a tester

Restore electrical wires and their insulation, clean contacts

Poor heating due to the formation of a large layer of scale on the heating element

Check the heating element with a tester, if it is working properly, remove the heater and inspect it

Clean heating elements from scale mechanically and using citric acid solution

Check the heating element with a tester for open circuit and short circuit; the resistance between the contacts should be within 20-40 Ohms

If defects are detected, replace the heating element with a new one. How to replace the heating element

Faulty water level sensor (pressostat)

Clear the sensor receiving tube of any accumulated debris.

Replace faulty sensor.

Temperature sensor (thermostat) faulty

Check the sensor circuit for open circuit and short circuit with a tester.

Restore electrical connections, replace the non-functioning sensor (how to do this)

The electronic control unit (ECU) is faulty

There is no signal to turn on the heating element when all other components are working properly

Repair the ECU in a specialized workshop or replace it with a working one (how to replace a module)

Most faults can be detected and fixed on your own, but in some cases you cannot do without contacting a service center.

As practice shows, the most common malfunction in the absence of heating in a washing machine is the failure of the heating element due to the formation of a large layer of scale on it. To avoid this, it is necessary to add softening agents (Calgon, Antiscale, etc.) when washing. It is advisable to install a special filter for technical water purification on the incoming pipeline. Periodically (every 3-4 months) you need to clean the internal parts of the machine from scale with a solution of citric acid or other similar means.

Such preventive measures will extend the life of the washing machine and avoid the need for frequent repairs.

If you decide to carry out the repairs yourself, we offer the best range of spare parts for washing machines.

Source

Heater circuit

In any case, you should check the heating element first. The heating element is located behind the back wall of the machine, immediately under the plastic tank. You need to arm yourself with a Phillips screwdriver and remove the back panel of the case. It is better to move the washing machine away from the walls or furniture - this will make it more convenient to carry out diagnostics.

Before starting the test, be sure to unplug the power cord of the washing machine from the outlet and turn off the water supply tap.

After removing the back panel, you can see the tubular heater, temperature sensor and all the wires connected to them. It is advisable to take a photograph of the connection diagram - this will help not to confuse the phases during reassembly. The further algorithm of actions will be as follows:

• disconnect the wiring;
• take a multimeter, switch it to resistance measurement mode;
• lean the tester probes against the terminals of the heating element;
• evaluate the value that appears on the device display. The working heating element will produce a resistance in the range of 26-28 Ohms. A one on the screen indicates a break inside the device, a zero indicates a short circuit of the heater.

If the multimeter display shows “1” or “0”, you will have to change the heating element. In this case, the tubular heater cannot be repaired.

If the resistance values ​​coincide with the norm, the heater is checked for breakdown. The tester should be switched to buzzer mode. Next, the probe of the device is applied to the heating element. If the multimeter beeps, replacing the element cannot be avoided.

To change the heating element, you need to remove the faulty device from the “socket”. Sometimes the task can be made difficult by a dried out heater gasket. To extract an element, you must:

• treat the rubber seal with WD-40 lubricant;
• wait 15-20 minutes;
• disconnect the thermostat;
• Unscrew the screw securing the heating element;
• Use a rocking motion to remove the heater.

When purchasing a replacement heating element, do not forget to tell the consultant the serial number stamped on the body of the part. The ideal option is to remove the heater and go to the store with it to pick up a complete analogue.

Before installing a new tubular heater, you need to clean the “socket”. It is also advisable to stick your hand into the hole and pull out all foreign objects that have fallen into the tank during the operation of the washing machine. The machine is assembled in the reverse order. When connecting the wiring, be sure to focus on the photographs taken so as not to confuse the phases.

Supported range of Bosch washing machines

See the list of models below:

The MAXX 4 series includes two common modifications - Speed ​​Edition and Speed ​​Perfect.

The most popular models of them are:

W.F.C.

2062 OE, WFC 1664 OE, WFC 1666 OE, WFC 1665 OE, WFC 1667 OE, WFC 2060, WFC 1262 OE, WFC 1263 OE, WFC 1600 BY, WFC 1662 OE, WFC 1663 OE, WFC 2066 OE, WFC 2063 OE , WFC 2064 OE, WFC 2065 OE, WFC 2067 OE.

WLF

16180 OE, WLF 20180 OE, WLF 20181 CE, WLF 20164 OE, WLF 16060 OE, WLF 16062 BY, WLF 16164 OE, WLF 20060 OE, WLF 20170 CE, WLF 20271 CE, WLF 20281 CE, WLF 242 71 CE, WLF 16170 CE , WLF 16260 OE, WLF 16165 CE, WLF 16261 OE, WLF 20062 BY, WLF 20160 OE, WLF 20171 CE, WLF 20260 OE, WLF 20261 OE.

WFO

1640 OE, WFO 1261 PL, WFO 2050 GR, WFO 1661 BY, WFO 1662, WFO 2040 OE, WFO 2042 OE, WFO 2051 GR, WFO 2060 BY, WFO 2064, WFO 2264, WFO 2440 OE, WFO 2442 OE, WFO 2 450 , WFO 2451 GR, WFO 2464, WFO 2840 OE, WFO 2864, WFO 1660 BY.
WFR
2440, WFR 2441, WFR 2466, WFR 2830, WFR 2841, WFR 2866, WFR 3240.

WFH

2061 OE, WFH 1660 OE, WFH 2461 OE, WFH 1260 OE, WFH 1262, WFH 2060 BY, WFH 2460 OE, WFH 2062 OE.

The SpeedPerfect and SilencePerfect modifications are the highlight of the MAXX5 series.

Main model range:

WLX

20462 OE, WLX 2048K OE, WLX 20362 OE, WLX 20364 OE, WLX 20161 OE, WLX 16163 OE, WLX 20160 OE, WLX 2036 KOE, WLX 20361 OE, WLX 20480 OE, WLX 2046 1 OE, WLX 20370 CE, WLX 24460 OE , WLX 24363 OE, WLX 20460 OE, WLX 24361 OE, WLX 24362 OE, WLX 24462 OE, WLX 24463 OE, WLX 2448 KOE, WLX 20162 OE, WLX 24163 OE, WLX 20363 OE, WLX 24364 OE, WLX 16162 OE, WLX 20463 OE, WLX 16161 OE, WLX 16160 OE, WLX 20163 OE, WLX 24461 OE, WLX 24360 OE.

W.V.D.

24520 EU, WVD 2446 SOE, WVD 24460 OE, WVF 2400 EU, WVF 2401, WVT 1260, WVTI 2841 EU, WVIT 2842 EU, WVT 3230, WVD 24420 OE, WVTI 3240 EU, WVTI 2840 EU, WVTI 28 42 EU.

Main model range:

W.A.E.

2037 KOE, WAE 16160 OE, WAE 20440 OE, WAE 24160 OE, WAE 24360 OE, WAE 24440 OE, WAE 20360 OE, WAE 20370 OE, WAE 16440 OE, WAE 20160 OE.

Main model range:

W.A.E.

24463 OE, WAE 24164 OE, WAE 24467 OE, WAE 24443 OE, WAE 2049 KOE, WAE 16161 OE, WAE 20161 OE, WAE 20163 OE, WAE 20164 OE, WAE 20361 OE, WAE 2444 1 OE, WAE 24466 OE, WAE 16442 OE , WAE 20364 OE, WAE 2047 SOE, WAE 24163 OE, WAE 24468 OE, WAE 20363 OE, WAE 16443 OE, WAE 24444 OE, WAE 24462 OE, WAE 24364 OE, WAE 16163 OE, WAE 24442 OE, WAE 28444 OE, WAE 28443 OE, WAE 28441 OE, WAE 24361 OE, WAE 20443 OE, WAE 24363 OE, WAE 20362 OE, WAE 24464 OE, WAE 20442 OE, WAE 16441 OE, WAE 20441 OE, WAE 244 65 OE, WAE 2046 SOE, WAE 20444 OE , WAE 16444 OE, WAE 2044 SOE.