Errors in the Ariston gas boiler: how to find and fix the fault using the code

Failure of heating system units usually occurs at the most inopportune moment. At first glance, a gas boiler is a very complex device that can only be repaired by a trained gas service technician with experience, knowledge and manufacturer accreditations.

However, to quickly identify the cause, it is not necessary to study to become a gas technician. If an error occurs with an Ariston gas boiler, the system recognizes the problem and displays a fault code on the screen. In most cases, you can find a malfunction and adjust the heating yourself.

We will tell you how to promptly identify the maturation or occurrence of a breakdown. In the article we present you will find decoding of the codes and tips for correcting the situation. Our recommendations will be useful to those who decide to repair equipment with their own hands.

Heating circuit problems (error 1**)

For boilers with the Ariston logo, all error codes are grouped by node. For each case, you can determine the most likely causes of the problem and ways to solve it. It should be noted right away that not all faults can be fixed with your own hands.

The heating circuit is an integral part of the heating system. The gas boiler reacts to the behavior of the coolant and provides the user with information about emerging problems. Their solution can be related to both the boiler and the circuit elements.

If a malfunction occurs, an error code is displayed on the LCD screens of modern gas boilers. This is much more convenient than counting the number of blinks of LED lights as on older models

Error No. 101. Occurs when the coolant in the primary heat exchanger overheats and boils, when the temperature at the NTC1 sensor exceeds 102 °C.

This issue occurs in the following cases:

• Excessive maximum pressure within the gas valve, resulting in excessive heating. This setting needs to be adjusted.
• Low coolant movement speed. The problem may be caused by a clogged filter, the formation of restrictions from scale, or a breakdown of the built-in circulation pump. These problems need to be checked and corrected.
• Failure of the temperature sensor. In this case, it needs to be replaced.

Error No. 102. Pressure sensor readings are outside the permitted range. This can be caused either by a problem with the pressure in the circuit or by a breakdown of the sensor itself.

The latter situation usually occurs as a result of wiring problems such as a short circuit or open circuit. It is necessary to ring the wire from the device to the central board.

You can ring the sensor itself with an ordinary tester. The resistance should be minimal - 1-2 Ohms. If it is missing at all, then the sensor will definitely have to be changed

Errors No. 103-107 occur at extreme values ​​of coolant temperature. The system reaction occurs when analyzing the temperature in two places - at the water supply to the circuit and at the return point:

• № 103. 3 times within 4 minutes the rate of increase in the supply temperature exceeds 7 °C / sec.
• № 104. An increase in one of the indicators by a value exceeding 20 °C per second was recorded.
• № 105. The coolant supplied to the circuit is 55 °C hotter than the return flow. The problem was recorded 3 times in 4 minutes.
• № 106. The return temperature is 10 °C higher than the supply temperature. Recorded 3 times within 4 minutes.
• № 107. The return temperature is 30 °C higher than the supply temperature. Recorded once.

Considering that the temperature sensor has a simple design and, in fact, there is nothing to break, all that remains is to identify and eliminate the problem with insufficient coolant movement.

It may be caused by the following:

• Airiness of the heat exchanger or heating circuit. You may have to check the entire route for traffic jams.
• Filter clogged. This part needs to be cleaned or replaced.
• Pump fault. Replacement or repair of the device.

Error No. 108 is displayed according to the readings of the minimum pressure switch. It can be caused by the same reasons that are typical for errors No. 103-107. In addition, there may be a breakdown of the sensor or the wiring to it, as well as depressurization of the circuit and partial leakage of water.

If a leak occurs, the pressure in the system will drop. The gas boiler will stop on its own, which distinguishes it from its solid fuel counterpart or ordinary stove

Error No. 109 occurs when there is a problem with excess pressure - more than 3 Bar. This can happen if the make-up valve is not completely closed. For further work, it is necessary to drain some of the water to reduce the pressure in the circuit.

Error No. 110. Failure or simple wear of the temperature sensor. First of all, you need to check the contacts and integrity of the wire. If they are ok, then you will have to replace the sensor itself.

Error No. 111 occurs when the pressure in the circuit is below the permissible level. The factory settings for this parameter for Ariston boilers are 0.4 Bar. The sensor may be damaged or water may leak from the circuit.

Error No. 112. Problem with the return temperature sensor. You need to check its contacts or replace the sensor.

Error No. 114. Problem with the outside temperature sensor. You need to check its contacts or replace the sensor.

Error No. 116. Triggering (opening) of the thermostat for the safe operation of the heated floor. You need to close jumper TA2 on the main board. If the operation occurs again, then there are problems in the underfloor heating system. Usually this is the presence of an air lock.

Error No. 117. On some older models, there is control of the difference in temperature values ​​at the inlet and outlet 8 seconds after the start of operation. The boiler will stop if the heating does not start. Possible problems and ways to solve them are the same as for errors No. 103-107.

A clogged water filter causes problems with water circulation. This leads to boiler shutdowns and also has a bad effect on the pump.

Sometimes the indicator shows codes 1P1 – 1P4. These are not errors, but warnings that signal one-time sharp temperature changes. Such effects sometimes arise due to hydrodynamic processes characteristic of flowing hot liquid in a narrow stream. You shouldn't pay attention to them.

Features of Ariston gas boilers

The popularity of equipment under the Hotpoint/Ariston brand is associated not only with the low price of all products.
The functionality of this equipment is often close in its characteristics to the flagship models of well-known manufacturers. So, for gas appliances from this developer, the following functions are considered the norm:

• Automatically maintains the outlet water temperature regardless of any changes in the environment, as well as fluctuations in the temperature of the water itself and changes in its pressure. The flame intensity is adjusted without user intervention;
• Automatic pumping of air from the heating system, which creates safe conditions for the operation of the device;
• In the event of emergency situations, the operation of the circulation pumps is blocked.

Rice. 1

All protective systems, like the flame maintenance and regulation unit, operate via an electronic board. This allows you to organize not only a convenient panel with control buttons, but also an indication of the current operating mode, and, if necessary, error codes indicating the suspected cause of the problem.

The decoding of these codes is usually presented in the operating instructions. The owner of the equipment can independently understand the situation and, to the extent he has the skills, also eliminate the cause. But in most cases, such information is useful only to determine whether it will be enough to simply restart the boiler or whether it’s time to call a repairman to your home.

Hot water supply faults (error 2**)

These types of faults occur in Ariston double-circuit gas boilers. For hot water supply, the safety system is autonomous, which allows you to quickly identify the problem.

Many Ariston boiler models support the ability to connect a solar system as an alternative energy source for hot water supply. Therefore, some errors and warnings of the “2**” series are related to the operation of solar panels.

Error No. 201. Problem with the power supply to the temperature sensor - open or short circuit. It is necessary to eliminate the breakdown of the electrical wiring.

Errors No. 202-205 are related to the operation of the sensors. When the signal stops coming from them or it behaves unpredictably (sudden jumps in data), then these errors are triggered:

• № 202. Problem with the boiler or solar system sensor.
• № 203. Problem with NTC temperature sensor.
• № 204-205. There is a problem with the temperature sensor that records the operating values ​​of the solar collector.

To solve problems No. 202-205, you need to check the contact density. If this is not the case, then you will have to replace the faulty sensor.

Error No. 206. Problem with the cold water temperature sensor in the solar system. The solution is the same as for errors No. 204-205.

The temperature sensor is easier to replace than to clean. They are inexpensive, and they are easy to find, since parts with standard parameters are installed in the boilers

Error No. 207. Overheating of the solar thermostat. This may be caused by solar energy not being used to heat the water. Then the collector must be turned off. This malfunction can also occur when the thermostat breaks down. In this case, it will need to be replaced.

Error (warning) No. 208. Insufficient heating in the solar circuit. There is a risk of the coolant freezing. Turns on when the anti-freeze function is activated. Part of the energy from the gas will be used to heat the collector.

Error (warning) No. 209. Overheating of water in the boiler connected to the boiler. There may be a problem with the thermostat or its contacts.

Other breakdowns

In addition to those described above, the following codes may appear:

The second reason in this situation may be the NTC sensor; to check its functionality, measure the resistance at its contacts with a multimeter; if it is unstable, replace the sensor with a new one. If the safety valve is leaking, the gaskets may be worn out, replace them.

NTC sensor

How to determine the error code if the device does not have a display or does not have a dial, such as on the Ariston BS II 24FF model? This device is equipped with indicator lights, thanks to which you can determine the breakdown. So, for example, if the 90 indicator and the crossed out water drop icon are on, this means that the boiler has overheated and is blocked. To eliminate this, you need to check the pressure switch and its connection to the board.

Electronics failures (error 3**)

Such complex modern equipment as gas boilers are equipped with electronics for automatic operation and response to different situations. Control boards can fail as a result of aging, power surges, excessive humidity, or mechanical damage.

Error No. 301. Problems with the EEPROM board (non-volatile memory) of the display. If such a message appears, you need to check whether the EEPROM key is installed correctly on the motherboard. This must be done as described in the user manual for the corresponding model.

If the key works correctly, then you need to check the contacts of the cable from the motherboard to the display board. There may also be a problem with the LCD screen itself. Then it will have to be replaced.

The display is connected to the board using a cable. If the boiler is working and the screen goes out, then first of all you need to check the quality of the connection. Naturally, with the power completely off

Error #302 is a special case of the previous problem. Both boards pass the test, but the connection between them is unstable. Usually the problem is a broken cable core that will have to be replaced. If it is ok, then the fault is on one of the boards. They can be removed and taken to a service center.

Error No. 303: Main board faulty. Rebooting usually does not help, but sometimes it is enough to turn off the boiler from the network, wait and turn it on again (this is the first sign of aging capacitors). If this problem becomes regular, the board will have to be replaced.

Error #304: More than 5 reboots in the last 15 minutes. Talks about the frequency of problems that arise. You need to turn off the boiler, wait a while and turn it on again. You should monitor it for some time to identify the type of warnings if they occur again.

Error No. 305. Program crash. You need to let the boiler stand off for a while. If the problem persists, you will have to reflash the board. This must be done at a service center.

Error #306 : Problem with the EEPROM key. The boiler needs to be restarted. If the error repeats, you will have to change the board.

Error No. 307. Problem with the Hall sensor. Either the sensor itself is faulty, or there is a problem on the motherboard.

Error No. 308. The combustion chamber type is incorrectly set. You need to check the installed combustion chamber type in the menu. If the problem is not resolved, then the EEPROM key may be installed incorrectly or the motherboard may be faulty.

You can try to repair any electronic boards at a computer repair shop. Especially if the problem is caused by loss of contact or aging capacitors

Error No. 309. Registration of flame after blocking the gas valve. In addition to a malfunction of the motherboard (it will have to be replaced), there may be a problem in the ignition unit - loose closing of the gas valve or a malfunction of the ionization electrode. If the problem is in the electrode, then you can simply try to dry it.

Expert advice

• Before you begin repairing the Ariston boiler, you need to press the “RESET” button (translated as reset, playback, zero) and restart the heating installation. Often this helps restore its functionality. As a rule, the occurrence of an error is caused by voltage instability - a typical case in the private sector.
• If an Ariston boiler does not have a display and its indicator lights are blinking, it is not a fact that a malfunction has occurred. This happens when the Comfort mode is turned on. The heat generator is forced to adapt to the microclimate in the room, hence its periodic switching off/on

Communication with peripheral devices (errors 4**)

The screen of Ariston geysers displays error codes for standard peripheral devices. This was done in order to explain the reaction of the boiler automation to an emergency situation. In this case, the consumer will be able to try to fix the equipment breakdown or conflict on his own.

Error No. 401. Communication problem between the bus and the data transfer device. It can be caused either by a malfunction of the device itself or by damage to the bus. Repairs are only possible at a service center.

Error No. 402. GRRS/GSM modem malfunction. You need to check its connection or replace the device.

Error #403: SIM card problem. The contact has come loose or the card itself is damaged.

Error No. 404: Data transmission between modem and motherboard failed. First of all, you need to check the contacts. If they are tightly connected, then the modem is faulty.

The GSM gas boiler control module allows you to remotely control the heating modes of the building. However, in addition to the obvious advantages, there is also a disadvantage - this is another unit that can break

Error No. 405-406. Data bus (interface) problem. Usually the fault lies in loosely connected contacts. Less often the tire itself needs to be replaced.

Error No. 407. Lost signal from the room temperature sensor. You need to check the connection (wire and contacts). If they are in good condition, then you need to replace the sensor itself.

Expert's conclusion

When stopping the Ariston boiler, you do not need to immediately call a technician and waste precious time. Just look at the code displayed on the display. Repair statistics show that in 85% of cases the user can solve the problem on his own. But you shouldn’t resort to the help of “all-knowing and experienced” people. Some Ariston models have significant design differences, which are taken into account during the repair process. The main advisor is the manufacturer's instructions. The document must have a section with explanations for each error code.

Flame and ignition control (errors 5**)

Problems can arise in both open and closed combustion chambers. Although it must be admitted that there are few types of faults here compared to other components of a gas boiler.

Error No. 501. No flame when igniting.

This situation can happen for many reasons:

• No gas. You need to check the supply tap. It must be open.
• The system will not turn on if the voltage between the neutral and the grounding conductor is more than 10 V. The current leakage must be eliminated.
• The ionization electrode has failed. Before changing it, you need to check the quality of the connection to the motherboard.
• The power of smooth ignition has lost. You need to adjust this parameter according to the instructions for the specific model.
• Main control board faulty.

Error No. 502 : Registration of flame before activating the gas valve. It often occurs in the absence of a ground loop. If it is made according to the standard, then you need to perform the same steps as for error No. 309.

If the house did not have grounding, then it will have to be done for a gas boiler. Moreover, according to all the rules, otherwise the protective mechanisms will block the heating from starting

Error No. 504. Flame loss on the burner if it occurs at least 10 times during one cycle. It is necessary to check the gas pressure, the exhaust of combustion products and the gas valve.

Insufficient circulation, error 104. How I looked for the cause

According to the manual, I determined that 104 is “Insufficient circulation.” I reason: What could interfere with normal circulation? After all, the required flow of coolant can be hindered, for example, by a clogged filter in the heating system or slag that has accumulated in the primary heat exchanger. Or maybe the reason is the circulation pump? Has the pump really fallen off? To check it, unscrew the bleed screw on it, this will allow you to see whether the shaft rotates or not.

This must be done carefully as water may start to come out, not much, but it is better to put some kind of rag so that it does not get on the board.

There is a slot on the shaft for a wide, flat screwdriver, I tried to turn the shaft with a screwdriver... it didn’t jam, it rotates. I try to start the boiler and see if the shaft rotates. The cauldron reproduces its terrible sounds and again goes into defense. The shaft does not rotate. At the moment of startup I tried to turn it with a screwdriver.... I thought, what if a “dead center” suddenly appeared..... no, the shaft did not rotate.

I decided to check the supply voltage of the pump. When the presence of 220 volts was detected on the chip, the output was unambiguous.... Pump to be replaced. Ehh I think, again unforeseen expenses.

However, the conclusion was hasty; when I looked for the wires going from the board to the circulation pump motor, I noticed that there were more than two of them. For what? I started looking into it and this is what I found out.

Air supply and flue gas removal (errors 6**)

The system for supplying air and removing flue gases generated during the operation of a gas boiler can be natural or forced. Therefore, some errors may not occur for different devices. But we'll look at them all.

Error No. 601. The draft thermostat is triggered when the contact is broken or the smoke exhaust thermostat is internally damaged. It is also possible that the air vent system is clogged.

Error No. 602. The same thing, only for VMC type combustion chambers.

Error No. 604. The Hall sensor is faulty (it needs to be replaced) or the speed of the fan blades is low (it needs to be cleaned or also replaced).

Error No. 607. The contacts of the controlling pneumatic relay were closed before the fan turned on. This detail confirms that there is sufficient draft before ignition. To eliminate early closure, you need to carefully remove the pneumatic relay and blow out its tubes, removing dirt or condensation. If this does not help, the part will have to be replaced.

The air relay is connected to the exhaust chamber with a silicone tube. Sometimes there is a condensate trap there. If the problem is with the pressure switch, then first you need to check the integrity of the tube

Error No. 610. Thermal fuse contacts are open. This part needs to be replaced.

Error No. 612. Same as error No. 604, but on early Ariston models.

6p1

This code indicates incorrect air intake and an incorrect smoke removal process.

Causes of error 6р1

• Signal circuit defects. Error 6р1 occurs when there is no “visibility” between the EPU and the traction sensor. Check the lines for reliable contacts, absence of short circuits, breaks, or melted insulation.

Clean your Ariston boiler

• The tubes are clogged. Condensation or dust that came from the street through the filter. Blow it out, and error 6р1 will disappear.
• Loose fitting of tubes on signal ports. Weakening and cracks in the polymer that appear during operation of the Ariston boiler lead to error 6p1. The problem is eliminated by heat-shrinkable material, a high-temperature sealant.
• Deformation of plastic. Microcracks and tube breaks (CONDENSATE TRAP according to Ariston specifications) are reflected in the traction. The code is cleared by replacing the problematic part.
• Condensate collector overflowing. A miniature cylindrical container where moisture entering the chimney accumulates. Emptying will remove error 6р1.
• Venturi device deformation. Under the influence of high temperatures, the plastic bends, cracks, melts, and the hole is blocked.

Venturi boiler ariston
The air flow to the draft sensor weakens (stops), the pressure drops, the microswitch does not work, error 6p1 is displayed. Replacing the device is a matter of a few minutes; the services of a professional are not needed.

1. Damage to the condensate trap. It is located above the combustion chamber and is exposed to thermal effects. Touching its upper part leads to melting of the plastic, the tightness of the air supply channel to the draft relay of the Ariston boiler is lost. As a result, error 6р1.
2. Sensor malfunction. Burning of the MV contacts leads to a break in the signal circuit - the ED will not see the message that the boiler is ready for ignition and generates error 6р1. The solution is to replace the traction relay. The loss of elasticity of the membrane is not critical - it is not difficult to revive the device: remove it, tap it on a hard surface. The microparticles adhering to the rubber products will fall and the Ariston boiler will start. This method of eliminating the error is a temporary measure: the relay should be replaced.
3. Fan problem. It turns on, but does not develop speed. The forced draft is insufficient, error 6р1 is displayed. Reasons: contamination of the blades, making it difficult to rotate the shaft (cleaning is required) or interturn short circuit of the winding. The malfunction cannot be eliminated - the fan must be replaced.

If the measures taken do not remove error 6р1, the reason is in the “brain” of the Ariston boiler (EPU).

Ariston boiler control board

Diagnostics of the board is carried out in a hospital setting, on a simulator stand. In everyday life, even a professional will not be able to determine the ECU malfunction that caused code 6p1: contact a service technician. When submitting an application, indicate the marking of the control unit of your boiler (marked on the board with symbols of numbers and letters). Replacement during diagnostics - and the problem with the Ariston emergency lock is solved.

Problems with multi-zone control (errors 7**)

Ariston brand boilers allow you to divide your house into zones, each of which will have its own heating mode. If a problem occurs with one of the sections, the system accurately determines the malfunction, so repair of a specific circuit can be carried out without interfering with the remaining normally operating parts of the heating network.

Error #70X. There is a problem with the coolant supply temperature sensor in zone X. It is necessary to check the sensor contacts or replace this part.

Error #71X. The same thing, only with a sensor on the return line.

Error #72X. Overheating has been detected in zone X. First of all, you need to check the operation of the thermostat responsible for this area. It may simply be a loose contact or a broken unit. If it works correctly, then you need to change the settings.

Error No. 750. Hydraulic circuit error. The correct type of hydraulic module connected must be set (menu parameter 720). If there is no error here, then the problem is in the settings of the circuit itself.

Code 103-107

Code 103-107

Errors in this range are associated with an increasing temperature difference in the supply and return pipelines.

There are several reasons for this:

• batteries are airy;
• pump is faulty.

Expert opinion

Grebnev Vadim Savelievich

Heating system installer

When this code occurs, the boiler operation is blocked automatically. The search for causes is sometimes complicated by problems with the central temperature sensor, which records false readings.

Decoding

Error 501 appears when there is no burner flame and is typical for all Ariston modifications. Its presence is monitored by an ionization sensor installed in the combustion chamber. There are several factors that trigger the appearance of such code, although solving the problem is not difficult. Error 501 is generated by the boiler’s electronic board after the 3rd ignition attempt (at full power) with a negative result.

What to do

Reignite using the Reset button. Two or three attempts resolve the 501 error.

Resetting error 501 through the reset button of the Ariston boiler

Resetting error 501 through the reset button of the Ariston Genus boiler

On a note. In Ariston boilers of the Class 24FF series, professionals note a factory defect - when pressing on Reset, the rod does not always reach the microswitch. If an attempt fails, it is better to restart directly from the control board (using the corresponding button).

Resetting error 501 through the reset button of the Ariston CLAS boiler

Code 209

Exceeding the maximum permissible temperature in the water heating tank, which happens when the thermostat itself malfunctions, as well as a sharp decrease in water pressure in the system.
The boiler is blocked, after which you can try to restart it. Frequent repetitions of this error are a signal that it is necessary to test the thermostat board and replace it if necessary. Problems in this category can arise both when there is a power surge in the network or when the contacts of working elements deteriorate. All codes start with the number 3.

Decoding

The 307th fault code is displayed on the display of Ariston boilers of the Clas, Genus and Egis + modifications. The reason is electronics failures: the instructions indicate an internal error on the board. It manifests itself in different ways: during the initial start-up of the unit, when dispensing hot water, and periodically during the operation of the boiler. There is no need to rush to buy a new EPU, given the cost of the unit. An analysis of correspondence on forums and statistics on troubleshooting Ariston boilers shows: in some cases, the cause of error 307 is removed by the user independently.

Ariston boiler gives error 307

Code 501

Code 501

When igniting, there is no flame or the flame disappears quickly. There are several reasons:

1. There is no gas supply, the valve on the pipe is closed.
2. The ionization electrode has oxidized or moved away from the board.

Do you need to check through the viewing window whether the flame appears at all or there is no spark? Specialists can fix the problem.

Decoding

The practice of operating Ariston boilers shows that error 502 often appears when starting up the unit after a long period of inactivity in an unheated (damp) room or as a result of a severe thunderstorm. Informs that the automatic control of the burner operation is detected when the valve regulating the gas supply is closed (false, stray flame).

Error 502 on the Ariston boiler display

There are several reasons why error 502 appears on the Ariston boiler display, so there can be no clear recommendation for troubleshooting. Based on his own experience and analysis of user correspondence on thematic forums, the author advises adhering to the following algorithm of actions. The conditions for placing the heating unit, the model, and the specifics of operation at each facility are different, so it is worth taking all opinions into account. Some hint will certainly help remove error 502 from the Ariston boiler.