What are the malfunctions of the Baksi gas boiler?

As a rule, any heating equipment is technically complex units, but the circuit diagram and design of the units are often very similar. To understand what malfunctions can occur, you need to imagine the processes occurring inside the boiler. The burner heats the coolant, the circulation pump pumps it and the heat is released into the room through radiators, the cooled water returns back, where it is heated again. If it is necessary to prepare hot water, a special device - a three-way valve switches the flow to a secondary heat exchanger, which, when heated, heats running cold water for consumers. The movement of liquid in different modes in the boiler is shown in the diagram.

Thus, for normal operation of any installation it is required:

• normal combustion
• correct supply and removal of air (to perform step 1)
• sufficient circulation
• serviceability of actuators and measuring instruments
• uninterrupted process control and security

Next we will look at everything in more detail.

Baxi Main 24 boiler does not turn on

Since modern boilers are equipped with electronics, they simply will not function without electricity. Moreover, some models are very demanding on the quality of power supply. Therefore, if the boiler has stopped, first of all you need to check whether it is connected to the network. There can be several malfunctions of the Baxi boiler due to the power supply: one of the household members accidentally pulled out the plug, for some reason the machine turned off, and there is no power in the boiler connection socket. In our practice, there was a situation when substations changed the connection diagram (changed phase and zero), and therefore we had a stop due to a phasing error.

Potential on metal parts of the boiler can also cause problems with electrical components (the body and metal parts must be reliably grounded).

Attention! Not all voltage stabilizers turn back on on their own after a sudden shutdown.

If, for example, there was a power surge in the network, the fuses could have blown, the serviceability of which can be assessed visually and, if necessary, replaced independently, but only with the fuses that come with the boiler (usually they can be found on the lid). If the fuses are intact, you also need to inspect the parts of the control unit itself for damage.

Damage to the electronic board can only be repaired by a qualified technician.

In other cases, most likely the user will receive a code on the display or other boiler indicators, by which it will be possible to understand in which specific boiler unit the problem occurred.

Installation features

Baksi devices use gas as a coolant, and despite all its undeniable advantages, it is dangerous. Gas boilers require a professional approach. The slightest error in installation can lead to very negative consequences. Installation of the device should only be carried out by highly qualified specialists. List of problems that DIY work can lead to:

• Freezing of the device in the winter season.
• The occurrence of an explosion.
• Fire.
• Penetration of carbon monoxide into residential areas.

Of course, modern gas devices have a high-quality protection system, but even “smart” automation is not always able to cope with problems that arose due to unprofessional intervention.
If we talk about a less serious outcome of the matter, the most common problem with self-installation is the incorrect operation of the equipment. For example, the device may not turn on and display error codes, despite the fact that the device is fully operational. Baksi boilers are energy-dependent units. They are not able to function without being connected to the mains. The connection rules are quite simple and are no different from the requirements for installing a standard electrical device. The device is connected to a 220 V network; grounding is required.

Of course, if there is no grounding, the boiler will not turn on with a “bang” sound, but this may negatively affect the operation of the equipment. Quite often, the boiler displays error codes due to simple connection errors. If at the moment it is not possible to ground, you should purchase a stabilizer with galvanic isolation.

In addition to the need for grounding, there are other features when installing equipment. It is very important to follow these recommendations:

• In order for the boiler to function properly, the pressure must be 170-250 V. At a lower voltage, the equipment will turn off, and at a higher voltage, the varistor will burn out.
• The sinusoid should flow without disturbances. Such devices react very negatively to voltage surges. Professionals advise installing additional voltage stabilizers. When installing gas boilers, there is no need to use UPS devices.
• The connection must be made through a separate machine.
• If the model is phase-dependent, it is necessary to maintain the correspondence of phase and zero.

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Baxi boilers hydraulic malfunctions and their elimination

Thermal energy is transferred to the coolant into the heating or hot water circuit through heat exchangers and a circulation pump. Accordingly, a common malfunction is poor circulation in the hydraulic circuit.

The quality of tap water often leaves much to be desired and, over time, the formation of dirt and scale deposits on the walls of the heat exchanger is inevitable. Gradually, the permeability decreases, the calculation of hydraulic resistance and the speed of fluid passage decreases. This leads to local or uneven heating of the liquid and difficulties with hot water supply. Most likely, the control unit will record this based on readings from temperature sensors and stop the unit. In this case, a characteristic crackling sound may be heard in the boiler.

Due to their design features, bithermic heat exchangers are difficult to clean from deposits and most likely you will have to buy a new one.

An obstacle to movement in the circuit can also be a pump breakdown, an air lock in the heating circuit, a lack of pressure in the expansion tank, low pressure in the system, clogged filters, or freezing of certain sections of the pipeline.

From practice: when laying heating pipes by a contractor, a small section of the pipeline was laid almost outside the premises and, during long-term severe frosts, froze, circulation stopped - emergency shutdown.

On modern boilers, depending on the model, flow sensors and pressure gauges are installed, and if problems are detected, the owner will receive the corresponding fault code.

Error classification

Baksi gas boilers have energy-dependent automation. For convenience, special error codes are displayed on the control display.

Conventionally, all problems can be divided into two types:

• complete blocking of the heating system;
• transition of the equipment to standby mode.

Very often, if the gas system is completely blocked, a manual restart of the unit is necessary, since the boiler stops functioning only during serious breakdowns that can lead to a threat to life and health.

The display shows the temperature as well as an error code in case of breakdown

Such problems include:

• stopping the fuel supply;
• system overheating;
• lack of traction.

Sometimes breakdowns occur that the system can handle on its own. In this case, the device restarts and continues to function. However, this happens very rarely.

Troubleshooting:

1. Code E01 appears on the display only when the flame sensor is triggered. In some cases this may happen accidentally. You need to make sure that the gas supply is normal and the sensor is connected correctly. After this, press the R key and hold it for 2-3 seconds.
2. Problem E02 is related to the thermostat. The system can issue such a code if the water is overheated or the sensor transmits an incorrect signal. Signal disruption is possible if contact is broken or the sensor is broken. Overheating also occurs due to improper circulation of the heat exchanger. This happens if there is a lot of scale in the equipment, the heating circuit filter is clogged, the pump is broken, or the unit is air-filled. The thermostat may break down or the contact between it and the control board may be broken.
3. If error E3 occurs in an open gas boiler, there is most likely a draft problem. This can happen if installed incorrectly. In addition, the thermostat sensor could be broken or the contact could be lost. In a closed system, the same problems are possible, as well as a faulty control relay or a broken fan. You can clean the fan yourself and lubricate the radiator bushing and axis.
4. Code E4 appears when there is no flame control. This usually happens due to a clogged chimney or other chimney problem or bad wiring. The error may warn of instability of the network voltage or failure of the electronic board.

Opening the boiler in case of breakdown:

One of the most common problems is error E10 on a Baxi gas boiler. This problem is associated with the sensor responsible for water circulation and pump operation. The Baxi E10 code appears if:

• gas pressure is reduced;
• there is a fault in the board contact;
• problem with the pressure switch;
• pump sensor failure;
• The filter in the heating zone is clogged.

When an E 10 error appears on a Baxi boiler, it is not always possible to fix the problem yourself. If the pump breaks, it should be replaced. You can also clean the filters yourself. Sometimes this is enough to fix the problem. More serious repairs should be carried out by a professional.

The name of the buttons and their functions on the Baxi boiler

Error a00

If this error code is displayed on the screen, this does not mean that the boiler is faulty. This code may appear on the display when the “Info” mode is activated. “Error” a00 rhythmically changes to numbers that display the current temperature at the inlet pipe of the heating circuit.

Error e00

This malfunction is very serious, since it indicates that the electronic control board of the boiler has failed. Error e00 can only be resolved with the help of a service center representative, and under no circumstances should you attempt to resolve this error on your own.

Error e03

This error can occur in a situation where, for some reason, the pneumatic relay does not work correctly. Also, an error code e03 may appear if the traction sensor is faulty. Also, this malfunction can occur in a situation where, for some reason, there is difficulty in removing combustion products. This may be due to:

• improper installation of the chimney;
• chimney blockage;
• failure of the exhaust turbine;
• complete failure of the pneumatic relay.

The Venturi tube, which is used to measure the draft force in the smoke exhaust duct, may also be faulty. When the turbine starts, the pressure in the chimney changes, and this change is captured by the Venturi tube. The tube is connected to a pressure switch in which the membrane is located. The membrane reacts to pressure changes, and its movement closes or opens the contacts of the microswitch of the pressure sensor. Incorrect operation of these elements can cause error e03 to appear.

You also need to check the turbine itself. First of all, the presence of free rotation of the shaft is determined, and then the fan itself is checked. The presence of voltage at the terminals of the wire that comes from the electronic board is also checked. The windings of the turbine electric motor are also checked. Their resistance should be in the range from 38 to 48 ohms. If the resistance does not meet these parameters, the fan should be replaced.

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Along with the turbine, you need to check the condition of the chimney and the correctness of its installation. The air relay must also be carefully checked for operation. You can use a pressure gauge to check.

Also, the cause of error E03 in Baksi gas boilers may be poor contact on the connectors that connect the electronic board to the turbine and relay. Poor contact can be caused by oxidation, which can occur when moisture gets into the connector.

Code E02 – thermostat-fuse against overheating

The manifestation of this error, displayed on the display as “E02” or “02E”, can also be accompanied by various variations of defects.

An example of the appearance of code 02E (E02) on the display of the Caldera Baxi Roca Victoria boiler model. Meanwhile, this kind of failure is also typical for other models.

In particular, the following defects may appear:

• the temperature of the main circuit water is exceeded;
• the circuit temperature sensor is faulty;
• no contact on the heating circuit temperature sensor;
• the coolant circulation in the primary heat exchanger circuit is insufficient;
• clogging of the filter, heat exchanger, presence of air in the system;
• circulation pump defect;
• fault on the electronics board.

The same errors are typical for boiler models that do not have a display. They are determined by the presence of a glowing indicator with a temperature marker.

Code E01 and E04 – flame control sensor

A situation typical for most models is related to the functionality of blocking the boiler ignition system. The classic error code for such cases is “E01” or “01E” (and also “E04” or “04E”), displayed on the information display.

If the design does not provide for a display, the same error is identified by the corresponding LED indicator.

Instability of the gas supply, malfunction of the flame control sensor and other technical malfunctions of Baxi equipment are the result of the appearance of code E01 (01E)

Relationship between error and possible situations:

• no gas supply;
• the contact on the flame sensor is broken;
• the flame control sensor is dirty;
• malfunction of the ignition system;
• on the power line, phase and zero do not correspond;
• malfunction of the gas tap, electronics, coaxial chimney.

Accordingly, based on possible malfunctions, you should check all of the specified components (elements) to ensure correct operation, and if not, carry out repair measures.

Error e05

A malfunction with this code indicates that the temperature sensor of the heating circuit is not measuring the temperature correctly. This can be caused either by a failure of the sensor itself or by a failure of the electronic board. In rare cases, it happens that contact between the electronic control unit and the temperature sensor simply disappears. In this situation, you need to carefully check the connectors that connect the temperature sensors to the electronic board.

Error e06

An error with this code also indicates a malfunction of the temperature sensor, but not of the heating circuit, but of the DHW circuit. This error can be triggered by the same reasons that are described in the previous section.

Codes E12 and E13 – DGP malfunction

The appearance of code “E12” (“12E”) or “E13” (“13E”) on the boiler display clearly indicates malfunctions associated with the operation of the differential hydraulic pressure switch.

Usually, during testing, a signal from the device is not detected, or there is a signal, but does not correspond to the specified characteristic (false signal)

The reasons for the appearance of the marked code may be:

• stopping the pump;
• presence of air in the hot water system;
• low circulation rate;
• there is no contact on the TIR or a “stuck” contact;
• membrane damage or filter clogging;
• Impulse tubes are clogged.

Accordingly, a technical check should be carried out to determine the malfunction of a specific element.

And in order to eliminate the problem, it is necessary to replace the faulty element or carry out preventive restoration work.

Error e10

Malfunction e010 occurs when the signal from the hydraulic pressure switch disappears. An error with this code may be caused by the operation of a sensor that monitors water pressure. There have been cases where an error with such a code occurred when the contact between the relay and the electronic control board was lost.

There are four main causes of error e10:

1. Leaks in the heating system.
2. Failure of the expansion tank, or lack of air in it.
3. Failure of the water pressure sensor in the heating circuit.
4. Clogged “oblique” filter on the return line.

Codes E21-22 and E97-99 – electrical and electronics

Both codes - "E21" and "E22" - indicate faults associated with the electronic board. Code “E22” may appear if the supply voltage drops below the control value (162V).

The same code is displayed on the display if the quality of energy supplied to the boiler does not meet the stated standards.

For code “E21”, a characteristic point is the scattering of controller parameters and disruption of normal gas combustion. If you lack experience and relevant knowledge, it is better to entrust board repair to a specialist.

Errors “E97”, “E98”, “E99” - all three codes are usually associated with defects in the electronics - electronic board.

Code “E97” indicates the frequency of the supply voltage does not comply with the standard. The code “E98” indicates defects that are present specifically on the electronic board.

The same thing is indicated by the code “E99”. True, the “99E” error can also be caused by too low gas pressure, as well as a malfunction of the flame sensor

The simplest defect is loss of electrical contact on the gas valve relay. In other cases, the board usually needs to be replaced.

Codes E25-27 and E32 – temperature defects

The appearance of any of these codes - “E25”, “E26”, “E27”, “E32” - is usually preceded by temperature changes in the heating circuit, occurring at a faster rate than set by the control system.

For example, if the temperature of the heating circuit (HC) increases by more than 1 degree per second, the code “E25” (“25E”) is displayed on the boiler display. For code “E26” (“26E”) to appear, the temperature exceeding the set temperature by 20 °C is usually sufficient.

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Malfunctions or failures marked on the display with code E26 (26E) are a reaction to temperature deviations. Due to temperature failures, other codes of the same group may appear

Reasons that traditionally cause such codes:

• blocking the circulation pump;
• filter clogging;
• air inside the system;
• defective temperature sensor KO;
• electronics malfunctions;
• Incorrect installation of the DHW sensor.

To eliminate it, it is necessary to carry out preventive measures aimed at checking and testing DHW and CO units. Air in the system is removed using standard plumbing practices.

The performance of the circulation pump is checked by electrical and mechanical parts.

Codes E50 and E62 – NTC sensor and flame control

The automation of Baksi boilers is adjusted to certain parameters of combustion stability, as well as to a certain temperature range of flue gases.

Error E62 – burner flame control sensor

If any of the two parameters (or both at once) goes beyond the settings, the automation is activated, and the code “E62” (“62E”) appears on the control display screen.

Traditional reasons:

• faulty or dirty flame control sensor;
• faulty NTC sensor;
• electronic board defects.

Sensors are tested by replacing them with known good ones, and electronics are tested with instruments designed for such purposes.

Error E50 – NTC temperature sensor

The occurrence of the “E50” error is typical for boilers of the ECO-5 and Main 5 models. The “E50” code is usually displayed on the control display due to the detection by the flue gas heating temperature sensor above 180 °C.

Another sensor present in the design of the Baxi boiler, a defect of which leads to the appearance of code E50 (50E) on the control display

In turn, a rise in temperature above the set limit may be due to:

• low coolant circulation rate;
• clogged filters;
• the appearance of hydraulic resistance in the system;
• low concentration of antifreeze;
• circulation pump defects;
• system contamination or air ingress.

Also, the fault code “E50” (“50E”) is displayed on the display when the NTC sensor breaks down, due to electronic malfunctions, due to incorrect settings of the gas supply valve.

Accordingly, elimination is ensured by consistent testing of the designated units and carrying out the necessary work.

Error e25

This error in Baksi boilers can also be caused by a large amount of air that has accumulated in the heating circuit. The airiness of the heating system contributes to the rapid heating of the coolant, and it is to this rapid heating that the electronics of the gas boiler reacts - it turns off the heating device, displaying error E25 on the screen. Also, the occurrence of this malfunction can be caused by a breakdown of the circulation pump, or failure of the temperature sensor. Most rarely, this error appears due to incorrect operation of the electronic control board, or lack of reliable contact between the circulation pump and the electronic control unit.

E26

The set temperature is exceeded by more than 20 degrees. Error e26 occurs for the same reasons as e25, and similar methods of elimination.

E27

Incorrect location of the temperature sensor in double-circuit boilers. Error E27 is caused by a sensor failure or incorrect installation. How to fix this failure is to check the operation of the sensor and its position.

E32

Error E32 signals the formation of a large amount of scale in the heat exchanger. To eliminate this, you need to clean the heat exchanger from scale. To clean it with a reagent, you need to remove the heat exchanger, first draining the water from it and turning off the water and gas supply valve.

E35

A parasitic flame appears before the flame sensor sends the gas valve open. Error E35 appears when water appears on the electronic board, the gas valve is depressurized, the parameters in the electrical network do not meet the requirements of the instructions for the unit, or the board has failed. Most often, installing a stabilizer and grounding helps in this situation.

Heating boiler board

E40

Blocked chimney or too low gas supply pressure. There can be many reasons for the E40 error, the main ones are a lack of gas supply, a violation of draft in the chimney, insufficient air, incorrect operation of ionization sensors, exhaust gases, failure of the gas valve, and the board does not work. You can check the chimney yourself; it is better to entrust the rest of the diagnostics to a specialist.

E41

Error e41 has the same causes and solutions as e40.

E42

Indicates loss of flame. Error E42 occurs when the chimney is clogged, there is no contact between the board and the fan, the fan is faulty, or the rules for installing the chimney are violated. You can check the draft in the chimney with your own hands; for everything else, it’s better to call a specialist.

E96

Error E96 lights up on the Baxi Main Four display when the mains voltage drops. In this case, restarting the unit may help. If the situation repeats, invite a specialist from the service company. On a Baxi SLIM device, this code occurs if there is a malfunction in the control panel. Only calling a specialist can help here.

Boiler Baxi Main Four

E97

If the frequency setting of the signal supplied to the board does not match, error e97 lights up. To resolve this, change the frequency.

Air intake and removal.

It's no secret that normal combustion requires a sufficient amount of oxygen. For safety, it is also necessary to prevent harmful substances - smoke gases - from entering the premises. The boiler automation, among other things, controls the draft parameters with special devices and if the draft is weak, the boiler will not function. Malfunctions of the Baxi boiler related to draft can be found in the instructions or article on Baxi error codes. If we are talking about a long period of operation and an installation error is excluded, then the breakdowns mainly come down to clogging of the air duct or incorrect operation of the fan (for turbocharged boilers).

From experience: on the coaxial chimney of some models, a fine mesh is installed to prevent large objects from getting inside. During the winter there will definitely be several days when frost forms on the street. Due to the small size of the mesh cells, frost forms and completely blocks the air flow to the boiler. The result is an unplanned stop.

The purpose of the fan is to remove flue gases. If he does not develop the necessary power, the defense will definitely react. This can happen for various reasons: dirt accumulated on the blades over time, wear of the bearings, the need for lubrication.

Gas valve and ignition

Malfunctions of the Baxi boiler related to the gas supply most likely cannot be determined by the user independently. Gas enters the burner nozzles through the valve and problems can mainly be caused by low pressure, a defect in the control board or a breakdown of the valve itself.

Constant operation of the boiler at minimum power may indicate a breakdown of the flame modulator - the owner can assess this visually and by the rate of heating of the coolant.

Attention! Adjustment can only be carried out by a specialist who has the necessary permission and qualifications.

To ignite gas in boilers, a special ionization electrode is used, which must be correctly installed relative to the nozzle block. Information about its correct position must be indicated by the manufacturer in the instructions.

The igniters are very fragile and should be bent with care. If there is a constructive possibility, specialists bend the place of its attachment so as not to damage the electrode itself.

What to do if the boiler turns off

Let's look at typical problems and ways to solve them.

Unsuitable power

If the boiler switches on and off frequently, it is due to excess power. Yes, yes, excess is the same problem as lack. A powerful device in a small room quickly warms up the area. Frequent shutdowns lead to wear of components, parts and rapid breakdown.

Before purchasing equipment, consider the following factors:

• climatic conditions;
• square;
• quality of insulation;
• number of windows and doors;
• purpose of adjacent rooms.

For large areas and private houses, floor equipment “Baxi” (Baxi), “Navien”, “Lemax”, “Danko” are suitable. Wall-mounted units will fit into a small apartment space. These are models “Bosch”, “Ariston”, “Visman”, Beretta, Vaillant.

But what to do if the boiler has already been purchased and installed? Don't go to the store for new equipment. Adequate solutions are needed:

• Installation of four-way valves in a hydraulic system.
• Modulation of the burner flame to minimum mode.
• Inclusion in the boiler circuit. This way the equipment will work not only for heating, but also to provide you with hot water.

Low pressure in the gas line

The problem is caused by problems with the common line or frequent interruptions in the fuel supply.

• Gas meter is clogged or broken. You may hear noise or other sounds. A working meter should change readings. If this does not happen, contact a specialist. You are not allowed to fix the problem yourself.

• The protective sensors have activated. Modern equipment is equipped with gas control and temperature sensors. If a fuel leak is detected in the system, the operation of the boiler is blocked on its own. Apply a soap solution to the connections to locate the leak. If bubbles appear, turn off the gas supply and open the windows for ventilation. Call the gas service immediately.

• Gas filter clogged. Clean.

Before the heating season, services check the condition of the mains. They also calculate the gas supply. If your home is constantly experiencing power outages, notify your gas utility.

Chimney problems

Problems with the presence of draft occur during the operation of turbocharged and atmospheric boilers. In the first and second cases, freezing of the outer part of the chimney is typical. Along with the removal of combustion products, hot steam also comes out. It settles into condensation, which freezes outside. This blocks the flow of air, so the device turns on and turns off immediately.

Way out: remove ice and insulate the chimney pipe. Then the drops will drain and not freeze.

To check for draft, light a match and bring it to the control window. If the flame deviates to the side - there is draft, if it burns evenly - no.

Facts about blocked chimneys:

• The mine can become clogged with construction waste. These are pieces of pipe that break off under the influence of condensation.
• Insulated sandwich pipes are susceptible to peeling of the zinc coating. It looks like a film blocking the passage.
• The mine becomes clogged with soot, soot, garbage from the street, and leaves.
• There have been cases when birds built nests on the chimney heads.

Actuators and control devices

Any gas equipment is a high-risk device, therefore it is equipped with automatic protective systems and controlled electronically. The gas valve is normally closed and opens by a signal from the control board, so in case of any malfunction on the part of the safety system, the supply to the burner will be stopped. The sensors themselves, pressure gauges, thermistors, thermostats, and electronic boards may also fail and the equipment will not start.

It is worth noting that boiler parts are usually reliable and the cause of breakdown is rarely a manufacturing defect. Mostly this is a consequence of non-compliance with operating conditions (overvoltage, poor water quality) and lack of regular maintenance.

Most likely, when defects are detected, the user will receive information in the form of an error code indicating which sensor specifically received the signal about the breakdown.