How to connect a Buderus gas boiler to electricity

The popularity and high demand for Buderus gas boilers is partly based on the relatively low cost of the equipment.

But the main factor determining preference among users is the high level of design and assembly, traditional German quality of components, precision and thoroughness of development.

Most owners, after purchasing a boiler, are not ready to operate such equipment due to an outdated approach to the operation of heating products.

The prevailing idea in people’s minds is that it is enough to turn on the boiler and no additional measures will be needed.

However, complex technology requires an understanding of the developers’ logic and design features, otherwise it will not be possible to achieve high efficiency and long service life.

How to set up a Buderus gas boiler

The basic adjustment of Buderus boilers is carried out at the manufacturer. After purchase, you only need to make some adjustments necessary for the most efficient operation of the unit under the given conditions .

As a rule, it is necessary to set operating limits for gas pressure and heating water temperature.

Gas supply parameters are adjusted using the adjusting screws of the gas fittings, while simultaneously monitoring the result of the actions on the control panel. A U-shaped pressure gauge is connected to the measuring fitting, with which the gas pressure limits are determined.

At this time, you need to start service mode 1.2.F (maximum performance).

Temperature setting is done from the control panel . By pressing the “-” button, winter mode is called up (the heating circuit is turned on).

Then press the “OK” button, the temperature of the extract air (direct or supply line) will then appear on the display.

Using the “+” or “-” buttons, enter the required values ​​and press the “OK” button again.

To set the summer mode, the same steps are performed, only when setting the value, press the “-” button until dots appear on the display. Then press “OK”, the crossed out radiator icon will be constantly lit on the display, indicating that the coolant heating is not functioning .

How to start the device correctly

The first start is made after connecting all pipelines:

• Direct (left) and return (right) lines of the heating circuit.
• Hot water supply.
• Gas pipeline.

In addition, you need to connect the power supply using a special socket with a grounding electrode.

The boiler electronics are very sensitive to voltage surges or surges, so it is important to protect the control board from them.

You must use a standard voltage stabilizer manufactured by Buderus, or something similar (which is somewhat worse).

The boiler is started either when it is first turned on or after the summer break.

In both cases, you must first fill the system with water . Checking the pressure gauge readings, fill the system to a value of 0.8 bar. The standard operating pressure is from 1 to 2 Bar, but it must be taken into account that when heated, the volume of water will increase, which will cause a rise in pressure.

After this, set the required coolant temperature on the control panel, which will cause the burner to start and the boiler to start operating.

Before turning on, it is necessary to bleed the air from the radiators using Mayevsky taps, otherwise an error will appear during startup. It is reset by pressing and holding the “OK” button, after which attempts are repeated until a positive result is obtained .

It is impossible to fill a hot heat exchanger with water, as this can lead to cracks and failure of the unit. Before filling, you must wait until the boiler has cooled down, and only then fill the system.

Buderus boiler error 6a

Error buderus 6a (second indicator flashes) occurs when the boiler does not detect a flame on the burner. Flame control is one of the most important functions of a safety system. To control the flame, there is a special electrode on the burner through which a small current flows during combustion. The control board constantly records this current. If for some reason the current at the ionization electrode disappears, error 6a occurs. The same thing will happen, for example, after several unsuccessful attempts to ignite the boiler - this is the most common situation.

The reasons are standard for all boilers:

• incorrect adjustment of the gas valve (insufficient supply gas pressure)
• poor contact or lack of signal from the flame ionization sensor
• malfunction of the flame control sensor (contamination, breakdown)
• failure of the control board (repair of the boiler control board is required)
• incorrect electrical connection of the boiler (lack of grounding)
• lack of air for proper combustion (lack of draft, clogged inlet pipe)

Error buderus 6a 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 to reset the error:

• keep the OK button pressed until the fault signs disappear, the boiler starts working again and the display shows the flow temperature.
• Turn the boiler power on and off

How to turn on after shutdown

The boiler is turned on by pressing the corresponding button . If the shutdown occurred due to external reasons (lack of gas in the main line, water or electricity outage), then you must first make sure that the supply of the necessary resources is restored.

If any components or parts fail, causing the boiler to shut down, the cause must first be eliminated - replace or repair the problematic component or part, restore oxidized contacts, etc. Otherwise, the boiler will not start, and the installation will immediately be blocked by the self-diagnosis system .

What coolant can be poured into a Buderus boiler?

Recommended antifreezes for Buderus equipment are Antifrogen N/L coolants from the German company Clariant. These are glycol-based antifreeze fluids that have proven their safety and effectiveness over many years of use.

These compositions can only be poured into the system in the form of solutions, and the concentration of Antifrogen N must be at least 20% of the total amount of coolant, Antifrogen L - 25% to ensure sufficient protection of boilers from corrosion.

When selecting and designing pumps, it should be taken into account that glycol acts as antifreeze. When the ratio of water and Antiphrogen is 1:1 (50%/50%), the thermophysical properties of the former change slightly and when designing, you can not take into account the reduction in the power of the heating boiler. The solution in the system should be checked at least once a year to evaluate the glycol concentration and the effectiveness of corrosion inhibitors.

Advantages of Antiphrogen formulations

The main advantages of Clariant products are the following qualities:

• protection against rust, scale deposits and freezing;
• low corrosion activity towards various elements;
• inertness to most cushioning materials;
• long service life - from 20 years;
• unsurpassed quality.

These products are reliable and durable antifreezes recommended by the boiler equipment manufacturer Buderus. They have been tested by many years of operation in Europe and Russia. You can buy Antiphrogen products at competitive prices from us by clicking on the appropriate button below.

Basic faults

The design of Buderus boilers was created on the basis of the most advanced technical developments.

They are stable in operation, but no insurance has yet been invented against the occurrence of malfunctions . Buderus boilers are equipped with a self-diagnosis system, which is a network of sensors connected to the most important and critical components or parts of the boiler.

The operation of all elements is constantly monitored by these sensors; if any inconsistencies or changes in the normal mode occur, an alphanumeric code for a particular error appears on the display. In addition, other malfunctions are possible.

Let's look at the most common:

• The burner does not light. The reasons for this may be disconnected starters of heating or control systems, failure of circuit breakers, failure of the boiler regulator or temperature limiter. The boiler may be blocked due to problems with the flue gas control equipment.
• The burner turns on, but immediately gives an error. Most often, the problem is a closed gas valve, or the presence of air in the gas pipeline. In both cases, you need to open the valve and let out the air.
• After the burner starts, a signal indicating the absence of ionization current appears. Usually the problems are oxidation of the contacts or mixed-up connections of the “N” and “L” electrodes. It is also possible that the ionization electrode is shorted to the housing or the burner automatic is broken.
• After ignition, the burner gives an error - the current is less than 1.5 mA. Here the cause may be oxidation or the appearance of soot on the ionization electrode, which should be cleaned.
• Boiling sounds are heard from the heat exchanger. This is a sign of the appearance of a thick layer of scale, or an insufficient amount of coolant in the system.

IMPORTANT!

Troubleshooting should be carried out by service center employees. Solving problems on your own can increase them many times over.

Buderus boiler malfunction

Like any other wall-mounted boiler, Buderus is equipped with a protection system and if an emergency occurs, the operation will be stopped and the user will receive an error message indicating in which system of the unit the malfunction 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 fault will be indicated by flashing temperature indicators. For example, if the temperature indicator flashes 80, this means a 3C error, which would appear on a similar boiler with a display.

A complete list of error codes reflected by blinking indicators can be seen in the figure. Next, we will consider the most popular errors and recommendations for eliminating them.

All main error codes and their interpretation

Let's look at the main error codes for Buderus boilers:

How to start a boiler

To turn on the boiler, use the “On” button located on the control panel.

For normal operation of the unit, it is necessary to correctly connect all power supply electrodes, it is especially important to have a connected grounding electrode.

NOTE!

If it is not there, the operation of the ignition equipment and control board will become impossible, which is why the boiler will either simply not start, or will immediately generate an error and be blocked. The use of conventional sockets for connecting is excluded; special samples with an active neutral are required.

User manual

Operating the boiler is not particularly difficult . The user is not required to perform any special actions other than the current temperature setting or switching the boiler to winter or summer mode.

In addition, in the summer you need to drain the water from the heating system, and at the beginning of the next season you need to fill the system again. This is also performed by the user, guided by the readings of the pressure gauge on the unit body .

If an error appears on the display, you must reset it by pressing the “OK” button and holding it in this position until the error disappears.

This is done because the control panel often perceives voltage surges as signals from the corresponding self-diagnosis sensors. If it appears again when you restart it, you need to call a technician.

Download instructions

Download instructions for Boderus gas boilers.

Service

Buderus boilers are serviced by specialists from service organizations.

It must be done annually; the necessary procedures include cleaning the heat exchanger, removing soot from the chimney, inspecting and adjusting the contacts of the control board.

It is not recommended to perform independent maintenance of the boiler; you can only clean the body of dust or soot that appears on it during operation.

IMPORTANT!

Carrying out any work on your own is regarded as termination of the warranty agreement by the owner, therefore, for repairs or maintenance, you must use the services of technicians from the warranty workshop.

Setting up and adjusting Buderus boilers

All heating units require regular balancing and adjustment of parameters. In most cases, a full range of such work is performed during boiler servicing. However, there are situations when unscheduled adjustments are required. For example, after an emergency stop, with a decrease in productivity, with repeated errors generated by automation or after upgrading the system.

Our center’s specialists are ready to carry out both one-time adjustments of your heating unit and take it for long-term maintenance. We are authorized to work with the entire Buderus model range, and our craftsmen have all the necessary licenses and certificates.

Boiler adjustment includes activities such as: warming up; checking the chimney and safety automation; control and debugging of the ventilation system, fuel supply and electrical network. We provide an official guarantee for all types of work.

For additional information on all types of services provided by our center, you can call our 24-hour hotline or come to our office.

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