Do-it-yourself rowenta coffee machine repair

What is a good and high-quality coffee machine for? Of course, for aromatic hot coffee in the morning. The brewing process of this wonderful drink is almost completely automated and requires minimal human intervention. The filling of the device implies the presence of many mechanical parts, electronic circuits, as well as a miniature hydraulic system. However, everything soon fails and these necessary devices are no exception. In the event of a breakdown of coffee machines, there are only two options: take it to the service or repair the coffee machine yourself.

1. Water supply interrupted. There is a blockage in the pipeline of the mechanism;
2. The coffee has acquired an unusual smell or taste. In this case, it is not always necessary to fix something with your own hands. Perhaps you just need to change the coffee tablets, and there is a very wide selection of them: Dolce Gusto - Dolce Gusto, Nestlé, Jacobs, etc. Alternatively, the filter of the coffee machine may be clogged. Cheap plastic can be another factor affecting the taste and smell of coffee. During operation, some parts of the machine heat up to 130 degrees, which can cause the plastic to melt;
3. Cold coffee. Most likely, your heating element has stopped working;
4. The espresso machine is not working. Many factors can affect this: the motor is broken, the pump does not work, the power cable is broken;
5. Water dosage exceeded (most often found in capsule coffee machines). Most likely, the breakdown lies in the engine or in the timer circuit.
6. The brewing time setting circuit does not work or the dosage into the cup is incorrectly adjusted. Of course, you need to focus on the model of the device and its brand, but a common reason is the improper operation of the engine control circuit, or one of its compartments.

Video (click to play).

If you are not sure that the repair of the coffee machine is within your power, then it is better to refer it to specialists. If the device is under warranty, then it is not worth disassembling it at all, it will instantly lose the warranty.

To repair the coffee machine, first you need to disassemble it. And how to do it correctly, step by step is described below.

1. It is necessary to find the back wall of the device, or rather the set screws. Unscrew with a screwdriver, pliers or whatever is at hand and is ideal for such work, set aside. It is worth noting that there may be several options for screws. They can be hidden, cruciform, or with a convex head;
2. The screws are removed, it is logical that the cover should be easily removed. However, if it cannot be removed, then there are hidden locks in the case. Most often these are ordinary plastic latches and they are located at the bottom of the back cover. From the outside, such a lock can be easily opened with a knife or a small screwdriver;
3. Finally, access to the "insides" of the machine has been obtained, it's time to start repairing it.

And so let's go in order. There is a blockage in the water supply pipe. In such coffee machines as: Delongee, Bork - Bork, Ariete - Ariete and others, cleaning is done using a long and thin rubber hose. It must be run along the duct and thereby break through the blockage. However, it will be much more effective to use special brushes on a flexible leg.

It is a little more difficult to clean the filter with your own hands. With frequent use of the coffee machine, the filter accumulates: scale, coffee residues, salt plugs, etc. Cleaning must be approached carefully, but the most important thing is to do it according to the instructions, otherwise you can violate the integrity of the part. In the process, it is allowed to use a soft swab sprinkled with alcohol. Rinse the filter thoroughly after cleaning.

If you are unable to solve the problem yourself, contact a Saeco espresso machine repair center.

The coffee machines of the firms Mulinex, Krups, Roventa, Saeko have another problem - water leaks. In them, the valve regulating the water supply is located practically in the filter. If the coffee does not stop pouring, most likely a worn valve is to blame, which leads to this phenomenon.

The valve cannot be repaired; in this case, only replacement with another new part is available. To understand whether the valve has broken, it is enough to pour coffee out of the machine, disassemble, rinse and inspect well for possible breakdown.

1. Initially, it is worth checking if everything is in order with the power supply. See if the cable is broken, check the grounding.
2. It also happens that household coffee machines produced in China simply lose contacts (they go away). Such cases were encountered with more famous brands: zauber, melitta, trevi. It is enough to check all the wire connections with the control circuit.
3. A common case for Senseo¸Siemens, Ufesa machines, they have low-quality thermostats built into them. To diagnose it, you need to remove one wire from its end and "ring" the contacts with a tester. If all is well, then the chain will be closed.
4. The heating element may also fail. Diagnostics is carried out in the same way as a thermostat. Replacing it with a new one is difficult, it will be easier to try to repair or buy a new coffee machine.
5. Very often, on the shelves next to the coffee machine, all the necessary accessories are sold that you will certainly need for the correct operation of the device. And for cleaning technical parts, it is definitely advised to buy special flexible brushes.

The principle of operation and repair of capsule coffee machines is slightly different from drip coffee machines. A small container of coffee powder is attached to the inside of the machine, the piercing mechanism is manually clamped. After use, the capsule is disposed of. Inside such devices, most often there are no temperature sensors, but there is an ordinary pump that runs on a timer. The water flow rate has been calculated in advance. If the water supply is carried out with the wrong dosage, then the time supply circuit may have broken.

Repair of coffee makers often does not depend on the brand or model; in general, they differ only in nuances. This can be the shape, as well as the location of parts, size, different types of sensors. The very principle of operation of the coffee machine does not change.

Any professional inspection for breakage always starts with the cord. It makes no difference whether it is a capsule or drip coffee machine repair. Then the power board is checked (if any), it is worth noting that the coffee machine has a lot of filters, diode bridges, and also transistors. All this must be inspected for burnout. This is the only way to recognize the true cause of the equipment malfunctioning.

The device of drip coffee makers

Household coffee machines (coffee makers) can be divided into two large groups: drip or filter coffee makers and ESPRESSO coffee makers. Drip (filtration) coffee makers are simpler and cheaper than ESPRESSO coffee makers and due to this they have become widespread. The range of devices of this type on the home appliance market is very wide. Among the most popular are the models of the brands BRAUN, PHILIPS, SIEMENS, TEFAL, ROWENTA, MOULINEX, KRUPS, UFESA, UNIT, CLATRONICS, KENWOOD, etc.

Through pipe 3, cold water from reservoir 2 enters a flow-through heating element (TEN) 4, mounted in a flask support. The power of the heating element in different models of coffee makers ranges from 650 to 1200 watts. The characteristic time from turning on the coffee maker to receiving the first portion of coffee is 4.8 minutes. To minimize this time in some models, for example, “Siemens Cafemat Prestige TC 10310”, forced heating (Ultra rapide) with a power of 1300 W is applied. In the coffee makers of this series, a stainless steel heating element is used, which is resistant to scale and corrosion.

The steam generated during boiling rises through the pipe 5 to the lid of the coffee machine 6. Due to the fact that the pipe 6 structurally passes through the tank 2 with cold water, steam condenses along the entire length of the ascending path. Condensate with a temperature of 95.98 ° C flows into the filter 7, previously filled with ground coffee. Through the neck 8, the drink enters the flask 9. The flask can be filled with the finished drink either through the hole in the center of its lid, or, as shown in Fig. 1 through the holes in the perforated strip on the lid spout. This design makes it possible to seal the flask with the finished coffee thanks to the sealing of the lid, on the one hand, and the coffee film, which is held by the surface tension forces in each of the perforation holes, on the other side.

Coffee maker flasks are made of durable heat-resistant glass. Many coffee maker manufacturers point out that their flasks can be placed in a microwave oven. In most models of coffee makers, after making coffee, the stand on which the flask stands continues to heat up to a temperature of about 80 ° C. In order to prevent drops from the filter from falling onto the heated support when the flask is removed from the stand, many models are equipped with a so-called "anti-drip" mechanism ("drop separator"), which is a pressure valve that is moved to the "open" position when the flask is placed on the stand (the flask cover presses the valve spring at the same time). When the bulb is removed, the valve spring is released and it moves to the “closed” position.

Most firms supply flasks as a separate accessory for coffee makers. Sometimes the problem becomes the termination of the supply of flasks to models of coffee makers, already discontinued, but still used by the consumer (the official service life of such equipment is about 3 years). The only way out is to select a flask of a similar geometry from other models.

Instead of transparent flasks made of heat-resistant glass in a number of models (“Rowenta Filtertherm FT-200”, “Siemens Cafemat Thermo Plus TC 90142”, “Krups Compactherm 10 Plus 207”, etc.), sealed thermos flasks are used, which allow you to keep the drink hot longer ...
The coffee maker can have a number of additional structural elements, for example, a water level measuring tube or a coffee strength regulator. The principle of operation of the "AromaSelect" regulator used in the BRAUN coffee makers of the "PureAqua" series (models KF 155, KF 130) is shown in fig. 2 [2].

When making strong coffee (Fig. 2, a), all the water flows through the filter with ground coffee. When the regulator is set to “soft coffee” (Fig. 2, b), part of the water flows around the filter and flows into the flask along the walls. By reducing the volume of water in contact with ground coffee, the extraction of bitter oils and essences is reduced.

The KRUPS coffee makers of the “ProAroma” series (model 314) have a function to select the strength of the brewed coffee by changing the input power [3]. With a power of 800 W, the time of contact between water and ground coffee is 10 minutes and the prepared drink has a higher strength. At a power of 1100 W, boiling is more intense, the contact time of boiling water with ground coffee is reduced to 7 minutes, which reduces the strength of the prepared drink (Fig. 2, c). In drip coffee makers, the first portions of water that pass through the filter with ground coffee usually do not have time to get saturated with the extracted substances, so if you pour a cup right away, as soon as about 100 ml of water flows into the flask, the drink will be too weak. To solve this problem, a reduced power level (550 W) is provided in the coffee makers of this series. Due to the low boiling intensity, the time of interaction of water with ground coffee increases, which makes it possible, by pouring a small amount of water into the tank, to get 1-3 cups of a well-brewed drink.

To improve the quality of the water used for making coffee, many models of coffee makers use a special filter (cartridge) placed in the water tank. This filter removes chlorine and scale-forming salts from water, while retaining essential minerals. In addition, the filter granules are treated with a bactericidal composition. A special indicator indicates the need to replace the filter.

Another additional element of the design of coffee makers is a timer, which allows, for example, to set the time for the morning start of the coffee maker in the evening. Often the manufacturer produces twin models that differ only in the presence of a timer, for example, the TEFAL coffee makers, models “880088 Mastria 1500” and “880588 Mastria Timer 1500”. A typical problem faced by the owners of products with a timer is the "leaving" of the clock (about 5.10 minutes per night). The reason for this is the absence of a stable internal source of the carrier frequency (crystal oscillator) and the binding of the timer to the mains frequency of 50 Hz, which often deviates from the nominal value in domestic power grids. It should be understood that devices for measuring time in household appliances (stoves, coffee makers, etc.) are by no means chronometers and, given this feature of their design, it is unreasonable to expect high accuracy from them.

In fig. 3 shows the structural elements of the Mastria Timer 880088 coffee maker, where

1 - cover, 2 - diffuser, 3 - filter holder support, 4 - housing with water tank, 5 - stand seal, 6 - cold water supply pipe, 7 - steam pipe, 8 - heating element, 9 - thermostat, 10 - pad , 11 - mains plug, 12 - bottom, 13 - electronic timer, 14 - decorative panel, 15 - cartridge stopper, 16 - dechlorinating cartridge, 17 - flask, 18 - measuring tube, 19 - flask lid, 20 - “anti-drip” valve , 21 - filter holder.

In fig. 4 shows a view of MOULINEX twin coffee makers.

Models AM7, T89, V91, CW5 and CW7 are produced without a timer (Fig. 4, a), with a timer (Fig. 4, b) - models V92, CG1, CW6 and CW8 [4]. The power of this range of coffee makers ranges from 900 W (models T89, V91, AM7, V92, CG1) to 1100 W (models CW4, CW6, CW8).

Common to all these models are a spherical bulb with perforation in the lid spout (see Fig. 1) and a 1.4 l water tank with a dechlorinating / anti-scale cartridge installed in it.

The cartridge must be replaced after approximately every 80 boiling cycles (corrected for water hardness). The signal for this in coffee makers without an electronic timer is the change in the color of the window of the mechanical indicator 1 (Fig. 4, a) to red. From the moment the color changes, no more than 5 times the coffee maker can be used until the cartridge is changed. The mechanical boil cycle counter contains an 80-tooth toothed wheel that rotates one step each time the pre-ground coffee filter holder is removed.

In models with an electronic timer, the signal to change the cartridge is the blinking of LED 2 (see Fig. 4, b). After changing the cartridge, press the “reset” button 3 with a sharp object.

A view of the control panel of a coffee maker with an electronic timer is shown in fig. 5 where

1 - liquid crystal time indicator, 2 - hour input button, 3 - minutes input button, 4 - power supply connection indicator (in some models), 5 - mode and power supply switch, 6 - cartridge replacement LED, 7 - “ reset ”, 8 -“ clock ”position, 9 -“ program input ”position, 10 -“ automatic mode ”position.

To set the current time when the coffee maker is connected to the network, switch 5 is moved to position 8 (“clock”). Pressing button 2 sets the current value of hours, buttons 3 - minutes.

The coffee maker can work in manual and programmed modes.

In manual mode, the coffee maker is turned on by turning switch 5 to the ON position, turned off by turning it to the OFF position.

The programmed mode allows you to set the coffee preparation time. To do this, switch 5 is moved to position 9 (PROG). The coffee cup image starts flashing on the LCD display. Pressing button 2 set the required hour value, buttons 3 - minutes. Move switch 5 to position 10 (AUTO). The cup image stops flashing - the coffee machine is programmed. The entered program will remain in effect on the next day if switch 5 remains in position 10 and the coffee maker is connected to the network.

The programming device also allows you to set the time for keeping the flask support in a heated state (without special programming, this time is 1 hour). With the OFF position of the switch 5 and the pressed button 3, the button 2 is pressed.Each press increases the heating hold-up time by 1 hour.

In fig. 6 shows the structural elements of the coffee makers of the indicated models, where

1 - flask cover, 2 - flask, 3 - valve spring, 4 - anti-drip valve, 5 - washer, 6 - tube, 7 - rocker arm, 8 - container for dechlorinating cartridge, 9 - dechlorinating cartridge, 10 - cartridge holder, 11 - power cord, 12 and 13 - connecting pipes, 14 - decorative cover, 15 - top panel, 16 - diffuser, 17 - filter insert, 18 - filter holder, 19 - mechanical counter lever, 20 - mechanical counter housing, 21 - mechanical meter cogwheel, 22 - red diffuser, 23 - decorative panel, 24 - water level indicator pipe, 25 - measuring tube, 26 - switch (for all models except V91), 27 - switch (for V91 model), 28 - button, 29 - diode, 30 - body, 31 - stand, 32 - heated plate, 33 - heating element, 34 - thermostat, 35 - clamp, 36 - hairpin, 37 - fuse, 38 - bottom, 39 - support roller, 40 - spring pin.

To dismantle the decorative cover, the hinges are first spread apart (Fig. 7). Slide the cover along the tube, and then remove the tube, first turning it back and then to the right.

Remove the top panel using a flat screwdriver slot to release the fastening latches (Fig. 8).

To remove the filter holder, use a flat screwdriver slot to release the fastening latches (Fig. 9).

Remove the water level indicator. To dismantle the front panel, squeeze out the five fixing lugs. For V91. Remove the front panel and remove the on / off switch (“strong coffee - weak coffee”).

After unscrewing two screws and squeezing out three clamps, remove the base, thus gaining access to the heating element.

Reassemble in reverse order, paying attention to the following:
* when installing a mechanical meter (models T89 / V91 / AM7 / CW4 / CW5 / CW7), correctly install the spring fixing pin (Fig. 10);
* when installing the electronic module (models V92 / CG1 / 458 / CW6 / CW8), correctly connect the contacts after removing the power terminal (Fig. 11). When installing the filter holder, correctly insert the projections of the lever into the corresponding slots.

When installing the filter holder, make sure that the guide lug 1 of the tube 2 is behind the stop 3 (Fig. 12).

The repair of Saeco coffee makers was discussed, they described what would break. The speech concerned coffee machines that can grind grain, dose, brew, pour into cups. The difference between the coffee maker is in its modest capabilities, there are plenty of designs. More often we find three on the counter: drip, espresso, capsule. There are quite large differences between them in the methods of cooking, the insides are similar. Each device has one 230 volt motor (for example, synchronous with a magnetized rotor) that drives the pump. More like a compressor, in some the piston goes back and forth. Creates high pressure (horn modifications). Consider how to repair a coffee maker with your own hands.

At the coffee maker, a container for water and a heating element form the basis, but there are further differences. The difference between a drip coffee maker and an espresso machine is described by the operating pressure. In the first case, boiling water simply drips onto the filter containing the poured coffee, the drink seeps further down, flows down, fills the cup. It is important to see the drop-stop function so as not to constantly collect moisture. In an espresso, a jet of water with a temperature of 95 degrees is thrown under pressure, forced through the tablet. To top it off, a special press drains the pomace. It turns out a dry squeezed coffee tablet. No additional filter needs to be installed. Coffee machines work on different principles, there are drip, espresso models.

Capsule coffee makers contain an infusion compartment with a needle, into which a plastic container of coffee powder is inserted. Brewing can be carried out under pressure or without.The first method differs from the second by the presence of a boiler in the design: water gains the required temperature, the compressor creates pressure. In the latter case, we often observe the possibility of obtaining milk froth. Stable bubbles are generated by the high temperature steam. The walls of the balls are cured by strong heat. One difference between brewing coffee and getting creamed:

Coffee is brewed with water of 95 degrees Celsius, to obtain steam, the heating elements work, reaching a threshold of 127 degrees. The modes are considered the best for traditional recipes.

Pay attention to the compressor: it allows you to brew coffee correctly, to get froth. The generated pressure is impressive, reaching 15 - 20 bar, more than is supplied to the heating system in the fall, checking during the period of technical measures. Managed to brew high quality coffee. In models of espresso (sometimes called carob), a special horn where coffee is applied. Then the structure is screwed onto the housing branch pipe, the handles are tightened with force. It turns out a dense tablet through which water is powerless to flow, having lost the circuit of a high-power compressor. It is possible to brew excellent coffee, not much different from the true drink obtained by the Turks according to generally accepted, traditional methods.

We describe in detail the device of a coffee maker, a variety of coffee makers, so that readers can imagine what is happening inside. Knowing the features of the functioning of the devices, it is easy to localize the breakdown. The main types of malfunctions will visit the mind automatically, the internal structure will become apparent.

We are writing the work of a drip coffee maker. Water is taken in by a container through a hose, pumped out by a pump. The flow heater delivers a fixed power, the pump speed is matched to the output temperature. Smart coffee makers have a sensor that monitors the parameters of the environment. By passing the pipe, the hot water reaches the upper compartment, which is equipped with a filter and contains ground coffee. The dosage is carried out according to the readings of the flow meter, or a temporary pump relay limits the duration of the heating element activation. Adjustment is possible. The spring timer works by feeding the pump through the spark extinguishing relay, or the electronic board monitors the flow meter readings, stopping the water supply at the right time.

In some cases, the temperature is not monitored at all. A portion is taken through a check valve. Then the heating element in a matter of seconds turns the liquid into steam, the jet rushes up the tube, filling the infusion compartment, and flows into the cup. The technique will not allow you to get true coffee, it is attractive for its simplicity of implementation. The coffee maker knows how many micro doses one cup can hold. The simplest manual counter controls the operation. The absence of water in the pipe for a new intake is controlled by a bimetallic plate. In the simplest case, the heating element immediately works on a volume of water equal to a standard cup of coffee.

The drip coffee maker has an hourglass-like shape; it is powerless to make cappuccino froth, latte. Self-repair of drip coffee makers is simple. Inside we will find:

• a heating element;
• water pump;
• control scheme.

There is an electronic filling of the microcircuits - there is a pulsed power supply that generates a constant voltage of the required rating (+5, +12 V). The efficiency is increased. To measure temperature, a bimetallic plate is used, which rarely breaks. The check valve can be easily checked by blowing in one direction or the other. The engine is running, controlled by a time relay (ordinary RC circuit), less often we see a flow meter, a level sensor. The pump rings, if the engine is collector, the action is repeated for the sections one by one.

Repairing a carob coffee maker seems to be the most difficult. There is not a pump - a compressor that pumps water under pressure into the boiler. The heater is located outside the tank.Outwardly, it resembles an iron: the heating element is bolted to the wall of a collapsible boiler. To regulate the temperature, there is a bimetallic plate, the sensor tension is adjusted with a screw for at least two positions. For brewing coffee, a temperature of 95 degrees Celsius is used, getting steam will require 127 degrees. Accordingly, the relay contact of the heating element opens at the right time. The boiler is durable, assembled in two halves, withstands a pressure of 20 atm without problems. The inlet is equipped with a check valve so that water does not go back during thermal expansion, heating.

The engine is made to dispense a fixed portion of water. The espresso maker is named after the coffee is poured into a long-handled cup. The tension design is put on the body, the coffee is rammed. Under the pressure generated by the pump, water fills the mug. Coffee makers are considered the best, experts say: carob models will allow you to take the maximum taste and aroma from the beans.

Inside the carob coffee makers, one motor belongs to the pump. Switching the path to steam supply is carried out manually. A collector motor is rarely used, the pump is relatively small, the point of fencing a garden disappears, there is a lot of noise. The pressure is generated by a piston (like a refrigeration compressor), which does not require much effort to develop. It is easier to save copper, use an induction motor. Brushes take up a lot of space. Carob-type coffee makers are equipped with power supplies for the engine and other elements.

Expensive models contain a motor compatible with inverter control. There are valves. A feature of the carob models is the presence of a boiler bypass valve. The pressure is dosed to ensure the correct brewing process.

Capsule coffee makers differ little from drip coffee makers. A small container containing coffee powder is installed inside, the piercing mechanism is manually clamped. After use, the capsule is ejected automatically, removed by the user of the device. Inside, the pump controls the flow of liquid, the instantaneous water heater raises the water temperature, reaching the set one. Sometimes there are no sensors, just the pump operates according to a timer. The water flow rate has been calculated in advance. It remains to substitute the cup. If water is not dosed correctly, we are looking for a power source for the pump motor. The timing circuit is faulty, no matter how the interval is set.