Viessmann Vitopend 100 boiler: malfunctions of the 24 kW gas structure, causes of errors F5 and F4

The symbols displayed on the display of the Visman boiler do not always indicate a malfunction. Sometimes they occur when switching between modes. The manufacturer indicates the meaning of the codes in the operating instructions. If you do not have the opportunity to look into it, you can read the decryption and troubleshooting methods in our publication.

Description of the model range

Viessmann Vitopend 100 is a whole line of gas boilers, including a wide variety of models. They are divided into single-circuit and double-circuit, with an open and closed combustion chamber. In other words, in stores we will find models for different operating conditions and user needs. There is also a power division - samples with power from 10.5 to 34 kW are on sale.

Features of Viessmann Vitopend 100 boilers:

• Reliable heat exchangers - they are made of high-quality copper (primary) and stainless steel (secondary). Some models have bithermal heat exchangers;
• Reliable circulation pumps - initially Wilo pumps were installed here, later Grundfos pumps began to be installed in boilers;
• Quick assembly and disassembly of equipment to speed up repairs and maintenance;
• Many safety systems - they control the presence of draft, flame, water and coolant flow;
• Simple management without unnecessary functions for the end user;
• Built-in diagnostic system;
• Premium build quality.

The operating instructions are supplied with each Viessmann Vitopend 100 gas boiler. If it is lost, download it here. But even an untrained user can understand the controls.

For the end user, there are two handles and one button on board gas boilers - nothing more is needed. The first knob is responsible for the temperature in the hot water supply circuit, the second regulates the temperature in the heating circuit. Temperature indicators and pressure in the system are controlled using a pressure gauge and a liquid crystal display - error data is also displayed on it. The button turns the circuits on/off, and resets when the electronics freeze.

The description also provides brief instructions for installing the Viessmann Vitopend 100 gas boiler and auxiliary equipment - boilers and underfloor heating systems. Here users will be able to familiarize themselves with the internal structure of the equipment. For specialists, guidance is provided on the design of heating and hot water systems.

Despite the presence of detailed instructions, installation, configuration and first start-up of the equipment must be carried out by specialists. They also connect Viessmann Vitopend 100 boilers to gas mains.

Application of the boiler Vitopend 100-W A1JB010 24 kW

According to its intended purpose, the Vitopend 100-W A1JB010 24 kW can only be installed and operated in closed heating systems in accordance with EN 12828, taking into account the relevant installation, service and operating instructions. It is intended exclusively for heating coolant that has the properties of drinking water.

The condition for intended use is stationary installation in combination with elements approved for use with this installation. Manufacturing or industrial use for purposes other than space heating or hot water preparation is considered improper use.

Boiler condition upon delivery

Gas combi hot water boiler with built-in plate heat exchanger for hot water preparation.

Integrated hydraulic circuit with 2 connections for heating circuit flow and return and 2 connections for cylinder or domestic water.

Integrated closed-loop hydraulic circuit with the following components:

• pump
• 3-way changeover valve
• safety valve
• membrane expansion tank
• plate heat exchanger for hot water preparation

Boiler care Vitopend 100-W A1JB010

As the device becomes dirty, the temperature of the flue gases increases, which causes increased energy losses. We recommend cleaning the device annually. The equipment can be cleaned with a standard household cleaner (not abrasive).

We recommend using a water hardness reduction unit in areas with water hardness > 450 milligrams per liter.

To ensure trouble-free, energy-saving and environmentally friendly heating, regular maintenance must be carried out. We recommend that you have your heating system serviced by an authorized heating specialist company at least every 2 years. To do this, it is best to conclude an inspection and maintenance agreement with a specialized heating equipment company.

Design Vitopend 100-W A1JB010

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Characteristics

Among the gas double-circuit boilers of this manufacturer, two main types can be distinguished: chimney boilers and turbocharged boilers. A special feature of chimney systems is that they can only be installed in rooms that have adequate ventilation and chimney removal. The second model is characterized by the possibility of installation in almost any room and even in an apartment, since such devices do not require special ventilation, and combustion products are removed thanks to a fan.

The standard model is a chimney, and it is purchased much more often. This version of the heating system has the boiler itself, a mounting frame and corresponding pipes for installing the ventilation system.

Installing this boiler is much more difficult than a turbocharged one, but it is quite possible to do it on your own. If necessary, you should seek advice or intervention from professionals.

In general, the Viessmann chimney boiler has the following technical characteristics:

• The power parameters of the heating device can be set independently depending on individual preferences. On average, the minimum rating for boilers of this type is 10 kW, and the maximum is 23 kW.
• The boiler has an expansion tank with a capacity of 6 liters.
• Temperature indicators are also set independently. Typically, the maximum water heating value is 85 degrees, and the minimum is about 30 degrees.
• The dimensions of the boiler are 40x72.5x34 cm, and the weight is about 35 kg.

The boiler has a control panel with an electronic indicator of the set values. This will not be particularly difficult, since all the controls are marked and understandable. A convenient display can show the temperature of the water in the system, the level of gas combustion, and if a malfunction occurs, it issues a special code, the designation of which can be found in the accompanying operating rules. There is also a pressure gauge on the panel (round scale with an arrow).

It is intended to indicate the pressure level in the heating circuit. After installing the entire system and starting to fill it with water, you must carefully monitor the pressure gauge readings. The manufacturer Viessmann indicates that the pressure should not exceed 1.5 bar. Also on the panel there is a button to turn the heater on and off.

Various additional upgrades offered by the manufacturer Viessmann can be purchased separately for the boiler. For example, you can install an automatic weather sensor, which is installed outside and, depending on weather conditions, transmits information to the boiler, which sets a comfortable temperature depending on this value.

Room thermostats are sold separately, on which the required temperature value is simply set, and the thermostat itself controls the heating device. Some thermostats have set temperature values ​​that should change throughout the day. For example, during the day the boiler may heat less, but at night more. There are also devices that allow you to control the boiler remotely.

Varieties

It was already mentioned above that boilers from this manufacturer can be chimney and turbocharged. In addition, they are divided according to several other criteria. Boilers can be double-circuit or single-circuit. Their fundamental difference lies in the number of contours, as the name implies. That is, a single-circuit boiler is responsible primarily for heating the room, and a double-circuit unit heats water for both heating and domestic needs. But if you have a single-circuit boiler, the problem of hot water can be solved by installing an indirect heating boiler.

Boilers can also be of a traditional type or condensing type. The principle of operation of a traditional boiler is quite simple - combustion products heat water and evaporate through the chimney. But the principle of operation of a condensing boiler is much more complicated - in this case, the combustion products condense, that is, turn into liquid. The design of such a boiler itself is much more complex. Also, such a boiler has a coaxial chimney, which consists of two pipes of different diameters that are inserted into one another.

One of the most famous is the Viessmann Vitopend 100 WH1D 263 boiler model.

This option has quite decent power - about 32 kW. This is a double-circuit boiler, which is used both for heating the house and for supplying hot water for domestic needs. The combustion chamber of this boiler is closed. The tank of the device has a large volume - 10 liters, as well as a powerful circulation pump with a safety valve. Such a boiler is guaranteed to heat the water to almost 80 degrees, and in a very short time. The price for this boiler varies within 45 thousand rubles.

Another gas boiler is the Viessmann Vitopend 100 WH1D 513.

The heat exchanger of this boiler is divided into two parts. One of them is made of high quality copper, and the second is made of stainless steel. Such separations are called “primary” and “secondary” heat exchangers. The power of this unit is high - 33-35 kW. This is a single-circuit boiler that is designed for heating. The approximate price will be 36-38 thousand rubles.

The next model is the Viessmann Vitopend 100-W A1HB

, which has a power of 24 kW. The boiler is single-circuit. This is a simple and convenient model with a high-quality chimney system, small dimensions and low noise level. The boiler is capable of heating water up to 80 degrees. The chimney diameter is 60/100. This is an excellent choice for heating a private home with a decent level of efficiency. The price for such a boiler will be approximately 39-40 thousand rubles.

Peculiarities

The Viessmann Vitodens 100-W WB1C110 model has the following overall dimensions - 400x700x350 mm (WxHxD), while the weight is 37 kg. Installation is carried out on the wall, which saves space in the room.

To obtain the declared power of 35 kW, the pressure of natural gas must be at 31 mbar, and liquefied gas - 45 mbar (permissible), reducing these parameters will result in a decrease in thermal power. ExpertKotel.ru reminds that most often in domestic networks the pressure is 12-20 mbar. The efficiency of the installation, with such values, is declared to be at a very good level and amounts to 108.4%.

Operating principle and main parameters. The condensation type of device involves the generation of heat from gas combustion and from the condensation of water vapor on the internal walls of an additional heat exchanger - an economizer. With equal fuel combustion, these boilers are much more efficient than convection boilers. The fuel is natural gas (methane, consumption 3.5 cubic meters/hour), liquefied gas is possible, specifically a propane-butane mixture with a consumption 2.6 kg/hour.

Primary heat exchanger. In the case of the Viessmann Vitodens 100-W WB1C110, stainless steel is used, its advantages are good protection against corrosion, and due to the smoothness of the internal surface, there is less tendency to accumulate sediment and scale, unlike some aluminum ones, it is relatively inexpensive, only ordinary steel is cheaper, service life is approximately the same as that of simple steel: 5-20 years.

The circulation pump is designed to pump coolant (water, antifreeze) through the heating circuit; it is a mandatory component of a closed-type heating system; in our case, the pump is included in the kit.

The expansion tank is designed to compensate for the expansion of the coolant in the pipes during heating and releases it back into the system when cooling. This makes it possible to maintain constant pressure in the circuit.

Price range

Viessmann products have a wide range. The range of wall-mounted boilers is very large, and therefore the price range is quite wide. The price of wall-mounted boilers of low and medium power (up to 34 kW) is in the range of 42-58 thousand rubles.

Condensing models are much more expensive - installations of the same power level will cost 95-207 thousand rubles.

The high prices of condensing equipment require the user to correctly understand their purpose and operating principle, otherwise there will be complaints about the low quality of the equipment.

In addition to the cost of the boiler, additional costs will be required for the purchase of a chimney, start-up measures and other organizational issues. It is recommended to find out all prices in advance so as not to get into an unpleasant situation when purchasing or drawing up a warranty agreement.

Main malfunctions of Viessmann gas boilers

Any complex structure can have a lot of possible malfunctions. However, Viessmann boilers are load-resistant and can independently compensate for many changes in operating conditions.

The most common unit malfunctions are:

1. Error F5. It means the occurrence of various problems with the chimney or the possibility of removing waste gases from the boiler. Appears due to blockage of the pipe with ice, foreign objects or birds, breakage of the switch or Venturi tube, etc.
2. Network controller failure. Occurs due to voltage surges. Since it is very easy to avoid damage to the controller - you just need to install a voltage stabilizer - the case is not covered by warranty.
3. Failure of the heat exchanger caused by hard water. This problem is widespread in our country, especially in houses powered by their own wells. The lack of technological water treatment creates conditions for the rapid accumulation of lime deposits, due to which the heat exchanger receives a heat-insulating layer. Because of this, the heating mode has to be increased, which leads to overheating and premature “fatigue” of the metal. The heat exchanger can be washed, but more often it has to be replaced. The solution to the problem is to use water softeners or filters.

This list is not exhaustive; other problems may occur, although they occur much less frequently.

All errors have their own code designation, which appears on the display based on a signal from the corresponding sensor.

Usually the first appearance of an error is considered as a consequence of interference and high sensitivity of the sensors. The error is reset using the “R” button, but if it repeats again and again, call a specialist for repairs.

IMPORTANT! Trying to solve the problem yourself is not recommended. You can permanently damage the boiler, create problems with gas equipment, and lose the warranty. All errors that occur are a signal to immediately call a technician from the service center.

Fuel economy

Automatic ignition (Electric ignition) allows the Viessmann Vitodens 100-W WB1C110 to start and extinguish the burner according to an algorithm when necessary, which saves fuel.

Modulation of the burner flame smoothly changes the intensity of the fuel supply and, if necessary, reduces or increases the flame, which reduces gas consumption.

• Gas consumption
• Meaning
• Natural
• Liquefied

Management and control

The Viessmann Vitodens 100-W WB1C110 gas boiler is electronically controlled, equipped with a display and has a port for connecting additional devices (usually thermostats, programmers, room remote controls, etc.). The advantage of the electronic system is that it does not require the constant presence of a person and can significantly save fuel (as described above), the disadvantage is that it is more complex than a mechanical one and depends on voltage surges (it can fail during surges).

Thermometer and pressure gauge. A thermometer is necessary to control the temperature of the coolant in the boiler, and a pressure gauge shows the pressure of the coolant; this is an important parameter, because exceeding it can lead to breakdown of individual parts or the system as a whole.

Why does it go out?

There can be quite a few reasons for the self-extinguishing of gas boilers, from external factors to self-blocking of operation by a signal from the boiler automation.

Let's look at the most likely ones:

• Stopping the gas supply. You should turn off the gas tap and contact your gas service for information.
• Failure of the gas meter. This option is also possible. The mechanism of the device sometimes jams, as a result of which it blocks the lumen of the pipeline and stops supplying gas. Sometimes it starts making noise or making unusual sounds. You need to call a specialist.
• Leakage sensors may be triggered. When a certain concentration of gas appears in the air, they turn off the boiler. It is necessary to call gas service workers to check all connections.
• Chimney problems. If the chimney lumen is blocked by ice or other foreign objects, the draft sensor is triggered, a corresponding error appears, and the boiler turns off.
• Flame extinction on open-type burners can occur due to the occurrence of drafts that disrupt the flame. The problem is solved by eliminating unwanted air flows. Doors or windows in opposite parts of the room are closed, and other causes of drafts are looked for.
• Often the cause of attenuation is reverse thrust. The main reason for its occurrence is a strong wind on the street, the direction of which allows you to create excessive pressure in the pipe. It is difficult to correct this situation; you need to take into account the prevailing winds when installing the boiler or purchase a turbocharger. At a minimum, a deflector or protective cap should be used at the chimney outlet.

The reasons for self-extinguishing of the boiler can be interruptions in the power supply and poor supply ventilation. To determine the source of the problem, the most common factors should be consistently eliminated in order to identify the culprit of the boiler shutdown using a method of elimination.

Error codes, their interpretation and how to solve the problem

Let's look at common errors in Viessmann boilers and how to eliminate them:

Most problems that arise require solutions only with the participation of qualified specialists from the service center.

Possible causes of error f2

• Lack of voltage at the terminals, unreliable contact, break. It is easy to identify and eliminate.
• Impeller contamination. A common cause of error f2 of the Wisman boiler. When the quality of the coolant is low, salt deposits and dirt accumulate on the blades, braking the shaft. Cleaning is carried out mechanically under running water.
• Bearing destruction as a result of lack of lubrication - replace.
• Shaft curvature. The rotation speed of the impeller decreases and error f2 is displayed. This spare part is not for sale - only pump replacement.
• Stator winding. Problems: open circuit, short circuit (to the body, interturn). Testing is carried out with a multimeter in ringing mode. Visman boilers are equipped with pumping devices from two manufacturers - to measure the winding resistance, you need to check the passport data. If in fact R is less, there is an internal short circuit (between the turns). To eliminate error f2, you will have to install another pump.

Heat exchanger

The cavity of the device gradually becomes overgrown with sediments, the circulation channel narrows until it becomes blocked. The primary heat exchanger of the Visman boiler requires regular cleaning, otherwise error f2 is inevitable; if the quality of the liquid is poor, it is carried out annually.

heat exchanger burned vitopend 100

Washing at home gives a short-term effect. Professional maintenance involves the use of a special aggressive environment, time-consuming, and removal of exfoliated fractions under pressure. In a service organization, restoring the heat exchanger’s functionality will take 2–3 days: during this time, a backup heat source will be used to heat the facility. This approach ensures that during the heating season there will be no problems with overheating of the Visman boiler.

Electronic board

A malfunction in it causes error f2. A specialist can detect and eliminate a defect - without experience, circuits, or instruments, it is better not to try.

Design of a gas boiler pressure switch

The design of the pressure switch does not differ in pronounced mechanical or electrical complexity. However, the pressure switch device for a domestic gas boiler still has unique parts, for example, a sensitive membrane.

This element is connected to a microswitch that acts as a signal switch. To control the burner, a group of three contacts is usually used (control in normal mode or emergency mode). Essentially, one contact is "shared".

A widely used version of a differential relay designed to work in the design of many household gas boilers. It looks like a technically simple device, but significant in terms of functionality.

The normal operating mode of boiler equipment is accompanied by the operating state of the thermostatic membrane, in which the circuit remains closed through one configuration of boiler pressure switch contacts. If the operating mode of the equipment is disrupted (the smoke flow changes the characteristic), the position of the sensitive membrane changes accordingly.

In this condition, the working group of microswitch contacts is broken, while the second group (emergency switching), on the contrary, forms a conductive circuit. Through this circuit, power is supplied to the automatic locking system, as a result of which emergency control of the gas burner is activated, as well as the water circulation system.

Thanks to the presence of a pressure switch, the following can be effectively carried out:

• temperature control;
• smoke pressure monitoring;
• control of condensation formation.

All the noted functions radically affect the operation of water heating equipment, ensuring not only effective functionality, but also safe operation of the boiler.

Possible causes of error f5

Viessmann connecting tube Tip.
In older models of Viessmann boilers, the pressure pipes are not insulated. If condensation appears in them regularly, this deficiency needs to be corrected. For example, by putting on them a piece of sleeve made of heat-resistant material of the appropriate diameter. Venturi device. To access it you need to remove the fan. Material: plastic. When the Viessmann Vitopend boiler operates for a long time at high temperatures and frequent overheating, the polymer deforms under the influence of high temperatures. Determined visually. Can't be repaired, can only be changed.

Venturi tube of Viessmann boiler

Traction sensor. There is a membrane inside the housing. When the pressure in the chimney changes, it changes position and affects the microswitch. Its contacts close or break the signal line circuit associated with error f5.

Viessmann pressure switch

Advice. Limitation of membrane mobility is caused by deposited particles. You can revive it for a while by shaking the sensor several times. But if it is the cause of the f5 error, it is better to change it immediately. The case is non-separable, so it will not be possible to eliminate the internal defect (loss of elasticity, problem with the microswitch).

Fan

Its failure is associated with an electrical or mechanical part. Before dismantling, you need to check the voltage at the terminals: perhaps error f5 is caused by a malfunction of the electronic board of the Viessmann Vitopend boiler.

Power comes in, Viessmann Vitodens fan does not work.

Mechanics

When you lightly touch the impeller, it should rotate freely, without distortion. If there are problems with this, you will have to partially disassemble the boiler fan. What could it be?

• Dirt accumulation on the blades. It is enough to clean the impeller with a toothbrush under running warm water, and the Viessmann Vitopend boiler error will disappear.
• Shaft curvature. The metal is deformed due to lack of lubrication. A typical case of non-compliance with the deadlines and scope of routine maintenance. You can't fix it - you'll have to buy it. The fan for the Viessmann Vitopend boiler (included) costs 8,620 rubles.
• Bearing failure. Replacement is easy. If after repair the impeller rotates easily, there is no need to balance.

Advice. There are blades on the fan motor shaft that are extremely difficult to reinstall. Specialists assemble without them. In practice, the Viessmann Vitopend boiler works perfectly without this part, which only serves to mix the air flow.

Electrics

The cause of error f5 is the motor winding. The shaft can rotate, but at low speeds. At the same time, the Viessmann Vitopend boiler fan emits a characteristic hum, indicating an overload. The coil is exposed to high temperatures, and the insulation gradually melts. A typical malfunction is an interturn short circuit or a short circuit to the housing. In the latter case, the defect is determined by a multimeter in the “ringing” mode. If there is a break, the device will show R=∞. The resistance of a working coil is 65±15 Ohms.

Electronic board

Generates error f5 Viessmann Vitopend if there is no signal from the boiler pneumatic relay. The price of a new controller is 14,650±250 rubles, and repairs in a workshop are not cheap. With some skills in working with devices, you can revive the Visman Vitopend board yourself.

If the cause of error f5 is a non-working fan (no voltage supplied), relay K1 (Panasonic ALDP124) is faulty. Dismantling and installing a new one takes just a few minutes. The main thing is to find a replacement. You should not purchase an analogue with a 24V coil on the market or in a store: in practice, after installing a “foreign” part, the Viessmann Vitopend boiler again shows error f5. It is better to buy the same relay or order it via the Internet (a single copy is rarely sold, mostly in sets of 5 for a total cost of 350–380 rubles).

Another option is to restore the functionality of K1. Error f5 Visman Vitopend indicates a break in the signal circuit. This is due to burning of the relay contacts, which can be easily cleaned with sandpaper (00). You need to carefully remove the cover, having previously unsoldered the attachment points of its legs (on the back of the board), and pry it off with a scalpel blade or knife. After processing the contact group, the feasibility of further use of K1 is visually determined. If there is a significant defect, the restored contacts will not work due to “burnout” of the metal: they may not touch each other at the moment of operation, and again the Viessmann Vitopend boiler will show error f5 - the relay will have to be changed.

How the device works

The operating principle of the gas boiler pressure switch is as follows. The sensor is equipped with a pair of contacts that are connected to two control circuits. In operating mode, one pair of contacts is closed; in standby mode, the other is closed.

Electrical resistance depends on gas pressure, and as pressure increases, resistance decreases. Since an increase in pressure characterizes either a violation of draft or overheating of the coolant, this parameter determines the possibility of normal operation of the boiler and, therefore, the need for its immediate shutdown. In the work of this type of indicator, two stages are clearly distinguished.

1. Ignition of gas. The heating system microprocessor supplies operating voltage to the air supply fan to the combustion zone. At the same time, the flame control function is turned on and the boiler goes into operating mode.
2. After the fan starts, the temperature drops, which triggers another pair of control contacts. If for some reason this does not happen, then when you try to re-ignite, only the fan will turn on, and the flame control function will not be activated. Thus, the boiler will not turn on. The launch will only take place when the air pressure is within the required limits.

Kinds

All Viessmann double-circuit boilers are wall-mounted. Floor-standing installations are single-circuit by default, although they have the ability to connect to an external storage tank or boiler.

They are equipped with an atmospheric partial mixing burner, which is capable of flexibly adjusting the amount of gas by partially mixing air.

There are two design options:

• Convection boilers. They work according to the traditional method, heating the coolant and releasing it into the heating system without additional procedures.
• Condensing units. Appeared relatively recently. The peculiarity of these installations is the preheating of the coolant using thermal energy obtained by condensing water vapor from the exhaust gaseous combustion products. Designed for use in low-temperature systems - heated floors, etc.

NOTE!

The efficiency of condensing boilers, declared by manufacturers, is up to 108%, which is impossible in practice and is a common marketing ploy. It is determined by adding the boiler efficiency and the maximum efficiency of the condensing chamber, which is incorrect from a theoretical point of view.

Summary and evaluation

Let us list once again the key features of the Viessmann Vitodens 100-W WB1C110 that are worth noting: excellent efficiency of 108.4%, electronic control, thermometer, pressure gauge, connected underfloor heating, there is a circulation pump. The boiler is mounted on the wall, and the protection systems include, as described above: overheating protection, freezing protection, gas control and a safety valve. The heat exchanger is made of stainless steel, the combustion chamber is closed.

Sources

• https://remont-system.ru/kotly/obzor-gazovyh-kotlov-iz-lineyki-viessmann-vitopend-100-s-otzyvami-vladelcev
• https://stroy-podskazka.ru/kotly/gazovye/viessmann-vitopend-100/
• https://ExpertKotel.ru/cat/viessmann/viessmann-vitodens-100-w-wb1c110
• https://expert-dacha.pro/otoplenie/kotly-ot/gazovye-k/proizvoditeli-gaz-k/gk-viessmann/oshibka.html
• https://SdelaySam-SvoimiRukami.ru/3409-diagnostika-i-remont-pressostata-kotla.html
• https://sovet-ingenera.com/otoplenie/kotly/pressostat-dlya-gazovogo-kotla.html
• https://KotelStroi.com/practice/pressostat-gazovogo-kotla.html

Other information

Note! Hot water capacity – up to 14 liters per minute. Gas freezing during cold periods is prevented thanks to new chimney designs.

A water heater with a volume of up to 50 liters complements the design of the Vitopend 222 model. Such products operate at a power of up to 10.5–24 kW, this is a kind of technical standard.

The most economical of all water heating boilers is the 100-F. The surfaces responsible for heating are made of special gray cast iron of the highest quality. Addition – lamellar or flake graphite. The thermal intensity of the boiler itself remains small.

The equipment is used to heat small rooms and water, since the power will be only from 29 to 140 kW. This option is also relevant for installation in utility rooms. The main thing is to remember which code is assigned to which error.

Series models

The Viessmann Vitopend 100-W series has two model lines:

• Single-circuit boilers are designated by numbers from 001 to 004.
• Double-circuit boilers are designated by numbers 009-012.

Numbers 001, 002, etc. indicate the boiler power.

Each model is marked with its own digital code:

• Number 001 is assigned to a single-circuit boiler with a capacity of 24 kW.
• 002 - single-circuit boiler, power 29.9 kW.
• 003 - power 34 kW.

Double-circuit boilers start with number 009:

• 009 - 12 kW.
• 010 - 24 kW.
• 011 - 29.9 kW.
• 012 - 34 kW.

Codes 004 to 008 are assigned to ready-made solutions, sets of single- or double-circuit boilers and external water heaters.

Digital marking is convenient in that it allows you to shorten long symbols to three digits, which accurately indicate a specific boiler model. This is convenient for both technical personnel and retail chain workers, speeds up model identification and simplifies document flow.

The first stage prior to connection is installation

According to the instructions, the hydraulic piping of the boiler should be carried out at the stage of finishing work. Then the level of tightness of all hydraulic connections you use is checked, as well as the final installation of the heating device itself from the Visman company.

To simplify system maintenance, special mounting devices developed by German specialists are used:

· mounting frame, providing reliable fastening of wall-mounted (suspended) models. This solution avoids the need to rework the existing pipework;

· reinforcement covers that cover and protect the open supply;

· hanging plate, which simplifies the installation of the boiler on the wall.

The detailed instructions included with the Wissmann heating equipment guarantee that all stages of installation will be carried out accurately. This ensures the durability of the equipment, ease of its further operation and maintenance.

Doesn't start

Turning on the boiler is often immediately blocked by automation that detects problems in the system.

Boiler failure at startup can occur for several reasons:

• No power or gas supply.
• The presence of air pockets in the system, due to which the circulation pump cannot operate.
• Failure of the control board or (more often) a short circuit of one of the sensors, causing the boiler to block.
• Problems with the chimney, in particular - the ingress of foreign objects, icing or burnout of the pipe.

You can figure out the gas or electricity supply yourself. People often forget to open the gas tap, or when connecting the boiler to the network, they use a regular socket, which makes it possible for the phase to be connected incorrectly.

Bleeding air from the system also does not cause any problems . All other problems can be solved only by contacting the service center.

You should not try to solve the issue on your own, since most often a lot of others are added to one problem, which requires expenses and does not guarantee a favorable result.

Pressure drops

A drop in pressure indicates a leak. This could be a dump valve stuck open, a leak in the expansion tank or heat exchanger, or damage to the pipelines or radiators of the heating system.

Usually, all problems in the boiler itself are immediately noticeable by drops or puddles of water.

Finding a leak in the system is more difficult, especially if underfloor heating is used. The solution to the issue can only be to detect and eliminate the leak or replace the unit unit that has lost its seal.