At the same time, like any other equipment, over time, even in these reliable boilers, certain problems arise. And since their design is quite complex, the variety of potential failures here is quite impressive. However, Baxi tried to make life as easy as possible for buyers of its products and developed its own self-diagnosis system. High-precision electronics analyze the characteristics of work processes, compare them with nominal indicators and, if a problem is detected, display information about it on the LCD display.
But information about errors is displayed in encoded form in the format E## or ##E, where E is an abbreviation for Error, and ## is a two- or three-digit digital value. Knowing the code and what problem it shows, you can try to fix it yourself or at least assess the extent of the problem. However, we strongly do not recommend trying to fix it on your own - this procedure should be trusted only to experienced specialists who comply with established regulations and take into account the design features of the equipment.
The explanation of error codes in some cases can be found in the manual for your boiler model. However, it will be much more reliable to have at hand a complete list of possible problems and their coded meanings.
About Baxi gas boilers
Baxi gas boilers have been present on the heating equipment market for quite a long time, and have shown their best performance. These heating devices are quite reliable and easy to maintain, and are assembled from high-quality components. Baxi have an adjustable flame level, which allows you to more accurately maintain the set temperature. The adjustable flame allows you to operate the boiler in a gentle mode, since the number of turns on and off of the boiler is significantly reduced. This feature allows the burner nozzle to last much longer, and also increases the life of the heat exchanger. All this is because adjustable flames reduce the frequency of heating and cooling of the heat exchanger, which has a positive effect on its service life.
Also, heating devices of this brand are famous for their efficiency, and they save not only gas, but also electricity. Baxi boilers are equipped with several temperature sensors that are located inside the boiler. But it also provides for the installation of remote temperature sensors that can be installed from the street side. With this arrangement of sensors, the boiler itself will respond to changes in air temperature outside the window and select the most optimal operating mode.
Despite the many innovative technologies used in heating devices of this brand, Baxi boilers are famous for their light weight and compactness. Even the floor-standing units from this manufacturer are quite light and small-sized. Baksi boilers are incredibly reliable, since all systems of this device are controlled by an electronic control unit. The electronics monitor all parameters of the boiler’s operation, and if the slightest malfunction occurs, the boiler’s operation stops and the error code is displayed on the liquid crystal display. Each code encrypts information about a particular malfunction, and decoding this code allows you to quickly identify the malfunction and eliminate it. Errors come in the following names.
Error e01
Malfunction e01 of Baksi boilers indicates a malfunction in the ignition system. This error is generated by the Baxi sensor, which monitors the flame. The error code can be reset manually, and to do this you need to hold down the “R” button. After 3-5 seconds have passed after pressing and holding this button, the boiler should start. If the flame does not appear and error E01 is displayed again on the screen, then only one thing will help in this situation - calling a boiler repairman. An error with this code can be caused by several reasons. This could be a failure of the ignition system, as well as incorrect operation of the electronic control unit. There have also been cases where this malfunction occurred due to an incorrectly adjusted gas valve. This error can also be caused by:
- weak draft in the chimney;
- low gas pressure.
Let's take a closer look at the reasons why error e01 occurs on Baxi boilers, and how to eliminate it. This error is sometimes very difficult to fix, since it can be caused by many factors. This malfunction is associated with difficulty igniting. On some models of boilers from this manufacturer, the electrode also contains a flame sensor, and this combination sometimes does not work correctly.
When the ionization current, which passes from the electrode through the burner to the ground loop without any obstacles, then the ignition works without any deviations. The control board records the parameters of the ionization current. If its strength is in the range from 5 to 15 microamps, then this can be considered the normal operating mode of the ignition system. When for some reason the ionization current strength deviates from the norm, the electronic control unit of the boiler records these deviations, and the Baxi gas boiler is blocked with error e01.
This error also appears if the contact of the electrode with the control board is broken. Also, if error e01 occurs, you should immediately check the gas pressure in the line. For natural gas, the pressure should not be lower than 2 mbar, and for liquefied gas - 5-6 mbar. The pressure can also be adjusted with a special nut located on the gas valve. It is also necessary to thoroughly check the operation of this valve - measure the resistance of the coils with a multimeter. The first coil should have a resistance of 1.3 kOhm, and the second - 2.85 kOhm.
The conductor that connects the gas valve to the electronic board may contain a diode bridge, which can also fail. This is a feature of some Baxi boiler models and the diode bridge should also be checked with a multimeter. You also need to check the resistance of the electrode itself. It should not exceed 1-2 Ohms. Also, the edge of the electrode must be at the required distance from the burner. This distance should be 3 mm.
Error e01 may also appear if ignition occurs, but the flame immediately goes out. This may be caused by reversed polarity on the 220 volt plug. By turning the fork 180 degrees, you can get rid of problems with ignition. These problems can also be caused by a ground fault. The voltage between phase and neutral phase and ground must be the same. The voltage between zero and ground should be no more than 0.1 Volt. If this parameter is violated, this may cause fault e01.
You also need to make sure that the gas line is isolated from the boiler. This line may carry a small electrical potential, which can cause a malfunction of the heating device. For insulation, a special dielectric spacer is used, which is placed between the gas pipe and the boiler.
Operating principle
The manufacturer uses metal to make the Baxi combustion chamber. On the outside it is covered with a layer of heat insulation. Above it there is a heat exchanger, which is made of copper. When there is a change in temperature in the room, the thermostat turns on. Please note that the launch is carried out automatically. From it the signal to turn on is transmitted to the pump. The latter creates a vacuum in the return pipeline. After this, heated water begins to flow into the heating system line under a pressure not exceeding 0.45 bar.
The boiler starts at low power.
It gradually increases until the temperature of the coolant increases to a given value. After this, the mode changes - from heating to modulation mode .
When the coolant temperature decreases, a signal is received from the temperature sensor, which leads to the opening of the inlet valve. After this, ignition occurs, and then the water is heated again. If already at the beginning of the boiler operation its power is quite high, then the burner is switched off automatically. After three minutes, you can restart the system.
If there is no need for heating the room, then the boiler is turned on in DHW mode. In this case, cold water enters the secondary circuit through a three-way valve, through which the heating line is closed. supplied to the burner through a gas valve , which leads to a gradual increase in boiler power. After heating the water, the temperature control mode is activated.
Error e02
Error code e02 indicates that for some reason the Baxi thermostat has tripped. If you hold down the “R” button, which is located on the boiler control panel, for 3-5 seconds, this error should go away. If after these manipulations this malfunction continues to appear on the display, then something serious has happened, and in this case you should also contact a service center. A malfunction with this code indicates that for some reason the Baxi gas boiler is overheating or the temperature sensors are not responding correctly to the temperature of the coolant. Incorrect temperature detection by the sensor can also be caused by weakened circulation of water or antifreeze in the heating circuit. There have been cases where foreign objects isolated the temperature sensor from the coolant, and therefore the sensor physically could not measure the temperature correctly, since it was isolated from water.
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.
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.
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:
- Leaks in the heating system.
- Failure of the expansion tank, or lack of air in it.
- Failure of the water pressure sensor in the heating circuit.
- Clogged “oblique” filter on the return line.
Doesn't light up right away
The cause of delayed ignition may be incorrect information supplied by the extract air or DHW temperature sensor.
If it gives a signal about the high temperature of these liquids, the command to ignite the burner will not work.
You can check the correct operation of the sensor by disconnecting the contacts from the control board.
If after this ignition occurs as expected, then the reason is in the sensor. If the situation has not changed, the search for a solution should be carried out in the ignition equipment itself. Alternatively, condensation may accumulate in the air sensor tubes. They need to be blown out, after which the burner will start in normal mode.
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.
Conclusions and useful video on the topic
The author of the video below examines another possible error that is not included in the list of the current publication. In particular, the video demonstrates a malfunction about:
The electronic system for detecting errors in the operation of the Baksi boiler with subsequent display of the corresponding code on the control screen is a very user-friendly service.
This is a significant help for mechanics when they have to deal with rather complex faults that require additional testing of equipment before and after repair.
If you have questions about the topic of the article or have valuable information that you can supplement our material with, please leave your comments in the block below.
