Typical breakdowns and repair of wall-hung boilers Buderus Logamax. Heat exchanger problem
Recently, they have gained great popularity in the heating equipment market. ... They rightfully occupy one of the leading positions in the line of wall-mounted boilers.
However, like any technique, these boilers can also break down. Of course, if hold regular Maintenance, the risk of failure of your equipment is significantly reduced, because during maintenance, specialists see what malfunctions or difficulties already exist, or may arise in the near future with a boiler, and eliminate the causes that could lead to breakdown in advance.
One of the most common problems encountered in wall-mounted boilers Buderus Logamax is breaking . A common cause of failure of boiler heat exchangers is the so-called "Hard" water. It got this name because of its composition, because it contains an excess of calcium and magnesium salts. And if even flushing the heat exchanger does not bring the desired result, then you have to replace it. The average cost of heat exchangers for boilers Buderus Logamax U 022, U 024, U 052, U 054, U 044 is 15 thousand rubles.
When going to a call due to the failure of a Buderus wall boiler, a service engineer should have in his arsenal, in addition to heat exchangers, an LED board, a motor (servo drive), a fan, a pump and even a Venturi tube. The average cost of repairing such a boiler, excluding the cost of spare parts, will cost the owner from 5 to 7 thousand rubles. Perhaps for some, this amount will seem high, but it is much it is better to professionally repair the boiler and again enjoy the long-awaited warmth than buying out of ignorance, wanting to independently carry out repairs, completely unnecessary spare parts.
Owners of boilers have repeatedly contacted our company, who independently decided to purchase a part that was supposedly out of order, but made a mistake in their choice, and demanding a refund for it. but if the spare part was installed on the equipment, it can no longer be considered new, and it cannot be replaced.
We strongly recommend that for repairing Buderus heating equipment, contact only qualified specialists who have the necessary technical equipment to carry out the repair. Don't fall for the attractiveness of cheap renovations- for 2 thousand rubles. a real certified engineer will not repair your boiler and will never give you a guarantee for his work.
If you are not 100% sure what the problem is and that you can solve it, immediately contact the service center for diagnostics and troubleshooting.
The emergency switch of the heating system is in the off position - on.
The start switch of the control system is in the off position - turn on.
Defective circuit breakers - check their performance, if required, replace the defective machine.
Damaged boiler water temperature regulator - check and, if necessary, replace defective parts.
Safety cut-out is damaged - check and, if necessary, replace defective parts.
Error message from external safety devices (for example, from a safety device for monitoring the water level) - the consumer must check the Buderus boiler, eliminate the malfunction and, if necessary, replace the element.
Control system triggered flue gas:
The boiler will turn on automatically if there is a heat demand. In the event of repeated tripping, check the flue gas path and check the function of the flue gas monitoring system. Replace if defective.
Is there a sound when an ignition spark is generated when the ignition cable is removed?
All gas shut-off cocks are closed - open the gas shut-off cocks.
The supply pressure of natural gas is more than 8 mbar - if not, determine the cause and rectify the malfunction.
Is the air removed from the gas pipeline? Remove air until gas can be ignited.
If the N and L connections are reversed, eliminate the error.
Is there a voltage between L and PE? If not, carry out PE grounding, in this case install an isolation transformer.
Poor contact of the ionization wire - eliminate the error, in this case replace the defective part.
Short to ground at the ionisation electrode - repair the damage.
Burner control defective - replace element.
The core or ceramic of the ionisation electrode is dirty - clean the ionisation electrode, if necessary replace the ignition burner.
Lime deposits or limescale build-up in the boiler - clean the boiler water circuit according to the manufacturer's recommendations.
In case of constant water loss, identify and eliminate the cause. If necessary, carry out water treatment and install a dirt trap.
If such an error occurs, the boiler control board does not receive a signal from the differential pressure switch, that is, its contacts do not close after the fan starts. The pressure switch serves to detect necessary conditions removal of combustion products.
The procedure for starting the boiler into operation is as follows:
Therefore, in order to understand the problem, you need to determine at what specific moment the boiler goes into error. If the fan starts, but the relay does not click, it is tedious to inspect the supply pipes, perhaps there is a blockage or condensation, or there is actually a blockage in the chimney itself.
If the fan does not start, you need to check if voltage is supplied to it. A defective electronic board may be the reason why the fan will not start.
If the fan is working, there are no problems with the chimney and pneumatic relay tubes, you need to check the pneumatic relay itself, creating a vacuum on your own and checking for a characteristic click.
Permanently closed relay contacts or their opening during burner operation will also be regarded by the safety system as a malfunction.
Buderus boilers can be equipped with a variable speed fan, which is electronically controlled and equipped with a sensor.
First of all, you need to exclude the accidental occurrence of an error and simply reset it. If the error occurs again and the boiler does not start, then the problem needs to be solved. The ignition problem in most cases can only be eliminated by a qualified technician. The simplest thing to do is to inspect the combustion chamber and electrodes for contamination and clean if necessary.
If the boiler makes unsuccessful attempts to ignite, visually check that the spark is piercing exactly on the burner, and not somewhere else. If you hear a crackling sound, but there is no spark between the electrode and the torch, the electrode insulation is probably damaged somewhere and needs to be replaced.
The gas valve can only be adjusted by a specialist. Checking the presence of the proper pressure of the network gas can be carried out through gas stove... If you light all the burners on the stove at the same time, they should work without interruption. If this is not the case, it can be assumed that the incoming pressure is insufficient and it is necessary to call the gas service.
In our practice, there was a case when a crack in the viewing window of the combustion chamber was the cause of a malfunction.
If the boiler ignites, but after a while it goes out, this may be due to a malfunction of the electronic board. You can check by replacing the board with a known good one.
For heating small private houses and cottages, we recommend gas boilers Buderus manufactured by Bosch Thermotechnology GmbH in Germany. There are several models of this company on the market - a gas boiler Buderus Logamax u072 24k and a boiler with the same power and similar parameters called Buderus Logamax U042-24K. How to connect individual heating in a private house can be found in our article "Autonomous heating of a private house: choosing the best way"
The line of models produced by Bosch Thermotechnology GmbH is quite large, but the purpose of this article is to acquaint potential buyers with the two most demanded models that represent the Buderus 24 kW gas boiler and their technical characteristics.
Reviews of the popular wall-mounted gas boiler Buderus 24 kW are mostly good. People write that the boiler is one of those devices that they "installed and forgot", that is, they do not require constant supervision. They often write that gas is consumed more economically, up to 20%, and about good performance. DHW systems(hot water supply). Of course, there can be only positive reviews. There will certainly be some drawbacks, for example, dependence on the electrical network and stopping the operation of the boiler when the gas pressure drops significantly.
Owner reviews for gas boilers buderus can be found on the Internet. There are many incomprehensible letters and numbers in the name of the Logamax U072 boiler. Therefore, in order to buy a Buderus gas boiler, you need to understand what they mean.
Deciphering "incomprehensible letters and numbers" is quite simple:
All technical data for Buderus gas heating boilers are indicated in the operating instructions, but for those who want to thoroughly study the Logamax U072 boiler, it is recommended to read the full description on the manufacturer's website. In many online stores that sell heating equipment, you can buy a Buderus gas boiler for a price around 810 Euro.
The boiler delivery set includes:
It should be noted that for the Buderus Logamax u072 24k gas boiler, the passport contains a warranty service coupon, in which you need to put the store stamps and the date of purchase. Without these marks, it will be very difficult to put the boiler for warranty service. One more thing. On the websites of online stores, you can easily find reviews on the Buderus 24 kW gas boiler and familiarize yourself with them to confirm your correct choice.
Online you can not only buy a Buderus gas boiler, but also order its delivery to any region.
It is impossible not to mention one more model - Buderus Logamax u042 24k. Its characteristics are almost identical to the U072 model. The main difference is in the direction of the piping. The U072 model uses a vertical scheme, which sometimes facilitates the process of connecting the boiler to the heating system. The u042 24k model is in great demand due to its compactness, performance and high efficiency, which reaches 97%. The set for the gas boiler Buderus Logamax u042 24k instructions and technical description specifies in detail the rules of installation, operation and safety rules. and how to legally connect autonomous heating in an apartment, you can read.
The range of models of this popular boiler consists of two models U042-24K and U044-24K. The difference between them is as follows. The U042-24K model uses a closed combustion chamber, while the other model has an open combustion chamber.
The technical data of the models are as follows: 
As with all German-made boilers, in this model, great attention is paid to the comfort and safety of operation. For comfortable use, auto ignition, flame modulation, an electronic thermometer and a power indicator are installed
This demanded and popular Buderus gas boiler reviews are mostly positive, thanks to the protective safety measures applied.
The Buderus Logamax U042-24K design employs autodiagnostics and gas control.
Great value for safe operation has pre-installed overheat and frost protection, safety valve and pump blockage protection.
Specifications:
The wall-mounted heating boiler has a built-in LCD display and mechanical control using buttons. The screen displays the operating data of the device, which allows you to constantly monitor the heating process. Reliable burner made of chrome-nickel alloy.
The control is carried out using a room thermostat. The safety of the device is ensured by built-in sensors for traction control, water consumption, and flame control.
The boiler is equipped with anti-freeze, anti-jamming three-way valve and pump functions. The built-in diagnostic system monitors the status of the device, finds and identifies malfunctions.
Easy to install and maintain, ergonomic, reliable, compact, works in winter-summer-vacation modes. A large number of service settings allows you to choose the most convenient operating mode.
The disadvantages are low power, high gas consumption, sensitivity to impurities in water. When the water is heated, the heating is turned off and vice versa.
Installation in rooms without a chimney is impossible, for the arrangement of which certain requirements are imposed. Requires additional air supply, cannot be used in a room with forced draft.
Upon receipt of the heater, check the equipment, appearance, warranty card and full operating instructions. Installation, connection, adjustment and initial start-up of the heating boiler should only be carried out by a specialist of the manufacturer.
During operation, the following points must be taken into account:
For sale heating devices this model in any specialized store of the company at a price of 29,000 to 30,200 rubles. Here you can also order a specialist for installation and initial setup of the device.
The Logamax range of 24 kW models includes boilers with both closed and open combustion chambers. Buderus U052 has a closed chamber and a forced combustion product removal system, and for logamax u054 an open combustion chamber is characteristic. The gas boiler is equipped with a bithermal copper heat exchanger. The hot water supply capacity is 12.6 liters per minute. It can be fueled with natural gas or LPG.
The logamax u052 boiler model is equipped with an 8-liter expansion tank, a circulation pump and electronic fire modulation. The operation of the unit is controlled using a convenient and understandable panel. It is also easy to control indoor temperature using a weather-compensated system. To the merits and peculiarities of gas boilers of this model include the following characteristics:
Buderus U052-24K boilers are designed for customers who value multifunctional equipment and want to purchase a device that allows separate temperature control.
The main advantage of this model of a gas boiler compared to the previous one is the fact that it consumes less gas with a similar power indicator.
There are hundreds of companies that produce gas boilers, but German products exceed them by an order of magnitude in terms of reliability and quality. What is the reason? The highest quality, famous German quality, is based on meticulous and careful design, scrupulous selection of materials and components. After the production of the prototype, tests are carried out and the design is adjusted according to the test results, and only then the release of the product begins.
Therefore, boilers of German companies are popular all over the world. They have established themselves as reliable, durable and cost-effective devices with high efficiency. For example, Buderus gas convection boilers have an efficiency of up to 97%.
The error logic is that the flow temperature rises too quickly, i.e. the coolant at the outlet of the heat exchanger heats up too quickly and to prevent emergency overheating, the boiler is blocked for two minutes. The main reason for this behavior of the boiler may be poor circulation of the coolant. Poor circulation is most often caused by:
In this article, we examined the most common faults in Buderus gas boilers. A complete list of errors is contained in the equipment manual. Modern gas plants are designed so that the elements are as accessible as possible for simplicity. service... The user can correct some errors on his own, for example, make up the boiler or inspect the chimney for blockages.
You should take any steps for self-diagnosis only in case of urgent need in compliance with precautions and safety. If you do not have an idea about the principles of operation and the device of a gas boiler, it is better to call a qualified specialist
The buderus company posts educational videos in which the specialist talks, including about the boiler errors that occur.
Check the gas outlet path.
Check heat exchanger for contamination.
Check flue gas temperature sensor and connecting cable for damage.
Check filling pressure and increase if necessary.
Check pump and bypass line.
Check the pressure in the system, temperature sensors, check the operation of the pumps and the fuse for printed circuit board, remove air from the device.
Check the temperature sensor in the burner chamber and the connecting cable for damage.
Check temperature sensor and connecting cable.
Check connecting cable and regulators.
Is the gas cock open? Check gas supply pressure, mains connection, starter electrode with cable and ionization electrode with cable.
Check the ionizing electrode. Check gas valve.
If there is a jumper, insert the plug correctly, check the external stop. Otherwise: is there a jumper?
Insert the coding plug correctly, measure and replace if necessary.
Logamax U054-24K
Logamax U054-24K
Check boiler sensor and connecting cable.
Check that the electrical plug contacts and start lines are tightly connected, if necessary replace the printed circuit board.
Replace PCB.
The brand in question, Buderus, is one of the most renowned manufacturers with a reputation for customer approval. Initially, success accompanied this company, originally from the German lands, because of their quality boilers that ran on solid fuels. But over time, the range of boilers operating on a variety of fuels has expanded significantly.
And the Buderus company also had such heating installations... Due to the unconditional quality, many retail buyers have worked with this brand, as well as those specialists who have completely installed heating systems in houses.
But the company's most vulnerable point was the high cost of their products. However, a couple of years ago, the company underwent a merger with Bosch, which helped remove such a major obstacle to mass distribution. Now high quality products are available to people at a very budget price.
Before a consumer decides to buy a Buderus double-circuit gas heating boiler, it is worth familiarizing yourself with the Buderus Logamax model range.
The market of sellers in Russia in the field of heating systems offers the consumer Buderus 24 kW mounted gas boilers.
All models can be used for the following systems to remove combustion residues, i.e. smoke:
Main characteristics lineup gas boiler.
The main typical characteristics for a gas double-circuit wall-mounted boiler Buderus contain the following data:
The boiler is quite easy to install, and since it has relatively small parameters and weight, you can pick it up from the store yourself.
The German company Buderus produces boilers that operate on almost any type of fuel - solid fuel, using firewood, coal, briquettes, coke, liquid fuel, operating on diesel fuel, gas and electric. The most popular are solid fuel and gas.
Solid fuel completely autonomous, can work without additional energy sources (without electricity), on different types fuel - wood, coal, coke, briquettes, peat. They have a long combustion cycle, thanks to the large loading chamber and ash pan. Buderus solid fuel boilers are used both as an autonomous system for heating and in conjunction with units that run on gas or diesel fuel.
Suitable for systems powered by a pump and for systems in which circulation occurs due to the temperature difference between hot and cold water, for open systems or with expansion tank... They have compact dimensions, they can be installed even in small rooms.
Gas boilers are the most common due to their availability and relatively low gas price. By the type of installation, they are divided into wall and floor, by the type of use, into single-circuit and double-circuit. Despite its small size, wall-mounted boilers have a large power range - from 14 to 100 kW, the most demanded are Buderus units with a capacity of 24 kW.
Gas boiler Buderus
Floor standing boilers can be used in residential premises and in production, they have a large power range up to 38 mW. Like all gas equipment, Buderus Logomax boilers are equipped automatic system control. During operation, the system displays data on errors and malfunctions on the display.
In addition to those described above, the automation can also give signals about other malfunctions on gas boilers:
There are problems that the display does not detect. For example, if you hear a loud noise of water or the water heats up for too long, you should adjust the pump speed. If the outlet water temperature is insufficient, check the turbine and change if necessary.
In case of problems with ignition, you need to check the gas pressure, whether the electricity is turned off, see if the connections of the electrodes with wires are oxidized, whether the chimney is clogged and sealed, whether the burner is clogged.
The model of gas boilers Buderus Logamax U072-24K with a capacity of 24 kW is the most economical of the presented ones. It has a closed combustion chamber, and depending on the quality of the house insulation, it can heat a room up to 250 m². The boiler can operate on both liquefied and natural gas. It is capable of providing up to 11.5 liters of hot water per minute. The U072-24K unit is equipped with:
This model is designed to work in your home or in an apartment of an apartment building, where each one has individual autonomous heating.
Note! A gas boiler does not require a solid chimney, it will be enough to bring an inexpensive coaxial analog outside the house. ... The main advantage of the Logamax U072-24K model is that it is able to provide full heating even in adverse conditions - with low gas and water pressure
Also, the advantages of this boiler are:
The main advantage of the Logamax U072-24K model is that it is able to provide full heating even in adverse conditions - with low gas and water pressure. Also, the advantages of this boiler are:
A feature of the U072-24K boilers is the presence of two heat exchangers: one copper, which heats the coolant in the heating system, and the second one made of stainless steel for heating water. Below is a video on how to properly configure the parameters of this model.
If you have a problem with choosing a 24 kW boiler from Buderus, you should familiarize yourself with the main advantages and disadvantages of the product.
The advantages of boilers from a well-known manufacturer include:
All products are highly environmentally friendly. The developers have introduced such a boiler design, in which the combustion products are obtained as safe as possible for the environment.
In addition to positive aspects, such products also have negative aspects. Their list can include:
More significant shortcomings in gas boilers of a popular brand cannot be found.
Like any other wall-mounted boiler, the Buderus is equipped with a protection system and in the event of an abnormal situation, the operation will be stopped and the user will receive an error message that indicates in which system of the unit the malfunction has occurred.
Some devices are equipped with an LCD display and the user will see an error code. If the boiler is not equipped with a display, the malfunction will be indicated by flashing temperature indicators. For example, if the temperature indicator 80 flashes, this means a 3C error, which would appear on a similar boiler with a display.
A complete list of error codes reflected by the blinking indicators can be seen in the figure. Next, we will consider the most popular errors and recommendations for their elimination.
The buderus 6a error (the second indicator flashes) occurs when the boiler does not detect a flame on the burner. Flame control is one of the essential functions security systems. To control the flame, a special electrode is present on the burner, through which a small current flows during combustion. The control board constantly detects this current. If, for some reason, the current at the ionization electrode disappears, an error error 6a occurs. The same will happen, for example, and after several unsuccessful attempts to ignite the boiler - this is the most common situation.
The reasons are common for all boilers:
The buderus 6a error is classified as critical, which means that after such a malfunction occurs, the boiler will not start on its own - the error must be reset!
There are two options for resetting the error:
Specifications:
With a small compact size, the boiler has many necessary and useful functions. It features an LCD display with a large backlit screen and push-button control. The screen displays data on the system operation. The device is endowed with the function of automatic parameter setting, equipment self-diagnosis and alarm.
To control the safety of operation, the boiler has sensors for water temperature, pressure, flow with a coarse filter.
It is equipped with a pressure gauge, a three-speed circulation pump, an overheating protection system, an automatic air vent and a safety valve.
Easy to operate, compact, no noise during operation, high performance, stable operation under pressure drops, good heat dissipation.
The disadvantages include the sensitivity of the heat exchanger to hard water (scale, deposits).
The boiler is connected only in closed systems DHW and heating, all other installations are considered inappropriate use.
To maintain the warranty, you must follow some guidelines:
At a cost in specialized stores, heaters of this model do not have a cardinal difference. They can be purchased at prices ranging from 28,900 to 30,200 rubles.
Wall-mounted and floor-standing gas boilers "Buderus" are high-quality and powerful enough heating devices, which are worth installing in your home. They have many useful features and are easy to operate. Installation of such devices does not take much time. The control panel in most models is intuitive. The high cost of the models is justified by their high quality.
When choosing a specific model, special attention should be paid to specifications devices. This will allow you to correlate its technical data with the tasks set.
2017-04-12 Evgeny Fomenko
The German company Buderus produces boilers that operate on almost any type of fuel - solid fuel, using firewood, coal, briquettes, coke, liquid fuel, diesel, gas and electric. The most popular are solid fuel and gas.
Solid propellants are completely autonomous, can operate without additional energy sources (without electricity), on various types of fuel - wood, coal, coke, briquettes, peat. They have a long combustion cycle, thanks to the large loading chamber and ash pan. Buderus solid fuel boilers are used both as an autonomous system for heating and in conjunction with units that run on gas or diesel fuel.
Suitable for pump systems and systems that circulate due to the difference in temperature between hot and cold water, for open systems or with an expansion vessel. They have compact dimensions, they can be installed even in small rooms.
Gas boilers are the most common due to their availability and relatively low gas price. By the type of installation, they are divided into wall and floor, by the type of use, into single-circuit and double-circuit. Despite their small dimensions, wall-mounted boilers have a large power range - from 14 to 100 kW, the most popular are Buderus units with a capacity of 24 kW.
Floor standing boilers can be used in residential premises and in production, they have a large power range up to 38 mW. Like all gas equipment, Buderus Logomax boilers are equipped with an automatic control system. During operation, the system displays data on errors and malfunctions on the display.
Using the example of one of the most popular units of the company - Buderus Logamax U042 24K and Buderus Logamax U072, we will consider the most common error codes of the Buderus boiler.
appears on the display when there is no gas supply. There can be many reasons for this situation. First, you should check if the gas cock is open. If the valve is open, and the system gives an error, check the reliability of the protective wire connection, the pressure in the gas line corresponds to the nominal one, if a pressure drop is detected, adjust it.
Also, the reason may be a lack of power supply, a violation of the draft in the chimney - check the draft with a lighted match or candle. If the flame does not deflect towards the chimney, then it is clogged and needs to be cleaned. Check the gas flow control relay, if defective, replace the relay.
Inspect the connections of the electrodes with the wires, if the contacts are dirty, clean them, connect if the contacts are broken. If you have not performed a technical inspection for a long time, perhaps the heat exchanger is dirty, clean it as described in the instructions for the boiler.
The cause of the malfunction may be a dirty burner jets, they should be cleaned with a brush. A breakdown of the gas block may occur, it is practically beyond repair, it will have to be replaced. Sometimes the reason may be the lack of natural ventilation in the room where your unit is installed, open the doors, window or window.
also appears frequently on Buderus Logomax devices. This fault occurs when the differential relay does not work when the fan is turned off, or the fan is operating at too high speed, the relay must be checked and replaced if necessary.
means that the heat exchanger temperature limiter has tripped. This happens when the pressure in the heating main drops - check and adjust the pressure when there is not enough water in the system - keep in mind that water can only be added to a cooled boiler so that cracks in the heat exchanger do not form due to temperature differences.
Boiler control system Buderus
The thermostat itself may fail, it cannot be repaired, a replacement is needed, the connection may burn out or oxidize, clean the contacts and connect them. If the 4c code appears on the indicator, the cause of the malfunction of the Buderus attachment may be a pump breakdown, replace it.
When airing the boiler, release the air from it, the procedure is described in the instructions for the device. Check the flue gas temperature sensor and its connection to the wires, if you notice a malfunction, oxidation or rupture, fix it. An error also occurs when the fuse burns out, replace it and if the integrity of the water heat exchanger is violated, then either it will need to be soldered or replaced.
Error 1h or error 1n appears on the display when the flue gas temperature is exceeded. The gas burner shuts down due to high temperature combustion products, possibly due to boiler contamination.
It is necessary to clean the boiler, detailed recommendations on this procedure can be found in the instructions. The flue gas sensor may be defective, replace it. If such a situation arises when the unit is initially turned on, this may also indicate an incorrectly designed, too narrow chimney.
It signals a malfunction on boilers buderus logomax u042 24k if the supply temperature rises too quickly. When error 2e appears on the display, water heating stops for 2 minutes.
Boiler panel Buderus Logamax U042-24K
What if this happened? To eliminate it, check the water pressure in the system, if necessary, top it up. The second reason may be a blockage of the pump, remove it.
Error 2p - signals an excessively rapid rise in temperature in the heating circuit. To eliminate it, open the service taps, check the water pressure in the system, clean the filters, check the pump operation, pump connection.
Error 3a means that the fan is not working. The cause of a malfunction in the boilers Buderus Logomax u042 24k and Buderus Logamax U072 may be sticking of the differential relay contacts, check the relay, if repair is not possible, replace it. Perhaps the contacts in the wiring are broken or the connecting hoses have come off.
It is possible that the fan itself has broken - repair or replace it. The error appears on the display and when the draft in the chimney is broken, check the tightness of the connection using a probe with an annular slot, clean the chimneys if they are clogged.
The causes of the malfunction in case of error 3c are similar to the reasons for error 3a, as well as the ways to eliminate them. Another factor, if this code appears on the indicator, sometimes condensation can form on the differential relay. To eliminate it, remove the relay, dry it with a hair dryer and reinstall it.
When the fan starts to run too quickly, the display shows error 3y. Check fan and exhaust system.
The reasons for the appearance of the code 4c on the display and the ways of troubleshooting are described above, in the most frequently repeated errors.
Code 6a is also one of the most common mistakes, why it appears and how to fix it, described above.
The def error means a burner error, the absence of flame ionization, can occur after a gas shutdown or when the gas pressure in the system does not match the nominal one. In this case, you should call specialists from the gas service to measure the pressure in the system and adjust it.
If the button is pressed for more than 30 seconds, the buderus logomax u072 display shows the error fd. To eliminate, you need to press the button again for a time less than 30 seconds.
Before proceeding with the inspection and repair, in case of a malfunction, it is necessary to reset the error by pressing and holding the "Reset" button for 5 seconds, when the indication stops blinking and the temperature values appear on the indication. And if only the failure recurs, proceed to troubleshooting the problem.
In addition to those described above, the automation can also give signals about other malfunctions on gas boilers:
There are problems that the display does not detect. For example, if you hear a loud noise of water or the water heats up for too long, you should adjust the pump speed. If the outlet water temperature is insufficient, check the turbine and change if necessary.
In case of problems with ignition, you need to check the gas pressure, whether the electricity is turned off, see if the connections of the electrodes with wires are oxidized, whether the chimney is clogged and sealed, whether the burner is clogged.
Spreading autonomous systems heating is associated with the development of individual housing construction.
In our country, it has not yet picked up the required pace, but in Europe this phenomenon has long since gained the necessary scope.
All the most famous manufacturers of boilers for private heating systems are European companies.
One of the oldest European firms - - will soon turn 300 years old, during which there was a collection of technological knowledge, experience and methods.
Consider one of the most popular designs of gas boilers for autonomous heating systems.
The Buderus company has been manufacturing heating equipment for many years. Currently, it is part of the Bosh holding, which significantly increases the capabilities and quality of products.
European equipment is too expensive for a mass Russian buyer, but this obstacle was significantly reduced by building and launching a plant for the production of gas boilers in Engels.
They are considered the most convenient for installation in residential or public premises, since they can simultaneously heat and prepare hot water for domestic needs.
This significantly increases demand and preference, although for families with large needs for hot water supply, the performance of double-circuit units is clearly insufficient.
If a large amount of hot water is required to ensure a normal lifestyle, it is more correct to use it in conjunction with an external boiler. The capabilities of double-circuit units cannot suit everyone, therefore it is necessary to determine in advance the volumes of hot water supply.
The manufacturer offers boilers with different capabilities and design features.
According to the installation method, there are only, all floor-standing boilers designed to connect external storage or boilers.
By the type of heat transfer:
By type of combustion chamber:
NOTE!
For use in residential premises, it is more convenient to use turbocharged boilers. Natural draft is unstable and depends on many external factors; in some cases, smoke may occur in the premises due to reverse draft.
Everything double-circuit boilers Buderus 24 kW belong to the group of attachments.
The list of models contains:
All models of Buderus boilers for 24 kW are capable of heating rooms with an area of up to 240 m2, with the simultaneous preparation and supply of hot domestic water. A feature of all options is the requirement for the quality and polarity of the power supply connection - it is imperative to use a stabilizer and an outlet with a connected ground electrode.
If this is not observed, the control board will constantly be at risk of failure due to power surges.
Consider the technical characteristics of Buderus units with a power of 24 kW:
The design of Buderus double-circuit boilers is, in general terms, similar to the device of all modern models gas units, the differences are only in small details. The main element is gas-burner, which is installed in conjunction with a copper primary heat exchanger for maximum effect.
The coolant, moving through the system under the action of a circular pump, enters the primary heat exchanger, where it heats up, and immediately passes into the secondary plate-type heat exchanger. It is made of stainless steel. A certain part of the heat energy is given off by the heating system for the preparation of hot water.
Then the coolant enters the three-way valve, where it receives the temperature set by the operating mode.
For this, it is partially mixed with the cooled return flow.... The finished heat carrier enters the heating circuit, makes a circle and enters the boiler again. The operation of all units is monitored by the control board, which, through a system of sensors, constantly monitors the condition of the boiler parts and immediately notifies the user about any malfunctions.
In case of danger, the operation of the boiler is immediately blocked.
The Buderus boiler is connected after installation on a solid wall or a special ramp.
All communications join:
Pay particular attention to the state of the connections gas pipelines... They should be checked with a soapy solution for leaks. Then the power supply is connected through a special socket with an earthing electrode.
The boiler starts up after filling the system with water.... It is poured using a make-up valve, bringing the pressure to about 0.8 bar.
This is necessary in order not to exceed the pressure during heating, so the water will expand. After filling the system, the boiler is turned on and the required coolant temperature is set. The burner starts up, the boiler starts working.
When starting up for the first time after a long period of inactivity, it is often necessary to make several start attempts due to air pockets in the system. When they are all removed, the operation of the unit will be stable and smooth.
The most common malfunctions, first of all, include the failure of the control board.
It occurs due to uneven voltage supply... It is expressed in the appearance of a series of errors on the display, the frequent indication of the error A6 (no flame) and other failures.
The issue is resolved only by replacing the board and installing a new one. The problem will recur if no voltage regulator is used.
Another common problem is an illiterate or self-made installation. There can be many options here, from installing a chimney without the necessary slope, to skewing the pipe. As a result, condensate will constantly accumulate, which, freezing, will block the chimney and provoke blocking of the boiler.
NOTE!
Installation and initial adjustment should be carried out only by specialists from the service center, otherwise the risk of spoiling the equipment becomes too great.
Let's consider the most common errors:
| Code | Decoding | How to fix the problem |
| H11 | DHW temperature sensor malfunctions | Check the contact group, determine the performance of the sensor, replace if necessary |
| 2P | Overheating of the coolant | Check contacts, determine the state of the circulation pump |
| 3A | Stopping the fan | Check contacts, replace the fan with a new one |
| 4C | Overheating of the heat exchanger | Stop the boiler, check the operation of the circulation pump and the extract air temperature sensor, call the wizard |
| 4U, 4Y | Short circuit or open circuit of the temperature sensor of the straight line (supply) | Check the condition of the sensor and contacts, clean and reconnect them, if necessary, replace the sensor |
| 6A | There is no flame | Check the presence of gas in the system and in the boiler equipment, call specialists |
| 3C, 3L, 3P, 3Y | Fan failure | Check connection and functionality, replace |
| 6C | The system sees a flame on an inoperative burner | Moisture on pins or control board, poor grounding contact |
Buderus double-circuit boilers for 24 kW are described in advertising brochures in a very favorable light.
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The German quality of Buderus gas boilers attracts consumers. But with improper operation or severe wear and tear of the equipment, sooner or later a breakdown will occur. Most of the buderus gas boiler faults are displayed by the system as a code on the screen. An explanation of errors is usually found in the instruction manual.
The most popular among consumers is the Logamax model, which produces not only heating, but also hot water. It is equipped with automation that diagnoses the nodes and, if there are problems, displays error data.
If the error appears on the screen for the first time, you need to try restarting your device. Sometimes it happens that after such a manipulation, it does not repeat itself. If the fault code of the mounted gas boiler Buderus is displayed again, then you need to find the cause of the problem.
| Error code | Causes of occurrence | Elimination method |
| A- | The "Chimney sweep" mode is on. The error disappears after 15 minutes |
|
| -H | Heating mode activated | |
| = H | Hot water dispensing mode active | |
| OA | Boiler in the mode between switching the burner on and off | |
| OS | Burner start | |
| OE | Thermal energy production is less than the minimum capacity of the device | |
| HE | Indicates the readiness of the equipment for work | |
| 0L | Opening gas valves | |
| 0U | Unit start-up | |
| 0Y | System shutdown, as the water temperature in the supply pipe has exceeded the set | |
| 2E | The boiler is in venting mode. The supply temperature rises rapidly |
Measure the water pressure or top up the heating medium in the system |
| 2H | Protection of pump and 3-way valve against seizure | |
| 2P | The hot water temperature rises rapidly. | It is necessary that the pressure is correct. Checking the pump, repairing it or replacing it |
| 5H | Automatic testing | |
| H11 (CL) | Faults in the DHW temperature sensor | The thermal sensor and its connection are checked. |
| H13 | The time of the check-up has passed | Inspect and reset errors |
| H31 | The system does not see the pump | Check pump wiring and operation |
| 0Y | The temperature of the heating medium at the inlet is higher than the maximum allowable temperature (more than 95ºC) | Diagnose the temperature sensor. Inspect the pump, connect it to the regulator. Adjust pump power |
| 3A (A3) | The fan is not working | Tighten the fan wires, replace the broken element |
| 3F | Continuous operation of the fan and burner lasts more than 24 hours. Rest mode activation | |
| 3U | The fan is turning too fast | Check the chimney for serviceability:
|
| 4C (1C) | Heat exchanger overheating protection activated | |
| 4U | Perhaps there was a short circuit of the temperature sensor on the flow | Checking contacts, replacing a part |
| 4Y | Breakage of the temperature sensor | |
| 6A | There is no flame | Open the gas valve completely. Perhaps there is no draft - you should check the patency of the chimney. Check flow switch, replace if necessary. Strip the sensor contacts and reconnect the wiring. Clean the burner jets. Replace defective items |
| 6C | False signal about the presence of a flame in the burner | Check the following nodes:
|
| 6L (def) | The burner is working, but there is no signal from the ionizer | Change settings and restart burner |
| 7L | Time control error on first delay or second start | Check the wiring that leads to the control unit. Replace BC20 regulator |
| 9L (d7) | Problems with gas fittings | Check the gas fittings and their wiring |
| 9P | No communication with unit identification module | Install the module in the correct position |
| 9C | DIP controller incorrectly set | Reconfigure |
| EL | Control modules are broken | Replace damaged items |
| 8Y | Temperature switch tripped or broken. No jumper between relay terminals |
Adjust the relay. Install the jumper. Check capacitor wiring and operation |
| fd | Button activation for more than 30 sec. | Press this button again and hold for less than half a minute |
In addition to internal errors, which are reported by the system in the form of codes, other problems may appear. Let's consider the most common ones.
The reasons for the situation in which the burner of the Buderus gas boiler does not turn on may be different:
Fixes the problem depending on the reason:
The unit should turn on automatically if there is a heating request. It is necessary to check the functionality of the smoke control system - if it is defective, it must be replaced.
The burner ignites, but quickly switches over to an error. There is no spark during ignition.
Check if there is a sound when a spark is formed:
Check if the gas shut-off valves are open. If not, open all valves. Is there no air in the gas duct? If there is one, release it.
This problem usually occurs for the following reasons:
In the first case, reconnect N and L correctly. In all other cases, replace the broken element.
This malfunction occurs when the ionization electrode is clogged. To fix the problem, you should clean this element. If this does not help, replace the burner.
The problem is usually caused by scale deposits or a small amount of coolant in the system. In the first case, it is necessary to clean the heat exchanger from clogging, and in the second, to eliminate the cause of the fluid leak.
