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. Gas boiler reacts to behavior 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 #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. The 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 coolant temperatures. 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 #108 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 #109 occurs when there is a problem of 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 #111 occurs when the pressure in the circuit is lower than permissible.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 #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 safety thermostat 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 #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 codes appear on the indicator 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.

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 #201. There is a problem with the power supply to the temperature sensor - an open circuit or a short circuit. It is necessary to eliminate the breakdown of the electrical wiring.

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

• № 202. Sensor problem boiler or solar systems.
• № 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 #206. Problem with cold water temperature sensor in 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 #207. Solar thermostat overheating. 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.

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 #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 – 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 #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 appear again.

Error #305. Program failure. 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 #307. Hall sensor problem. Either the sensor itself is faulty, or there is a problem on the motherboard.

Error #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 #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.

Communication with peripheral devices (errors 4**)

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

Error #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 #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 #404. Data transmission failure between the modem and the motherboard. 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 #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.

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 #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 #502. Registration of the flame before the gas valve is activated. 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 #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.

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 #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 #602. The same thing, only for VMC type combustion chambers.

Error #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 #607. The contacts of the controlling pneumatic relay were closed before the fan was 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 #610. Thermal fuse contacts are open. This part needs to be replaced.

Error #612. The same as error No. 604, but on early Ariston models.

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 #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.

Conclusions and useful video on the topic

Periodic maintenance of a gas boiler can prevent many problems. How to do this using the BS II series as an example:

Replacing a number of parts on the Ariston boiler - pump, feed tap, three-way valve. How to clean filters and passages:

The presence of an error signal on a modern gas boiler provides the user with the opportunity to deal with the problem of the problem. Next, you need to analyze the troubleshooting methods yourself.

Sometimes, to restore the operation of an Ariston gas boiler, it is enough to clean the contacts yourself, adjust the gas supply power, or reboot the device. However, it is better to entrust all breakdowns associated with malfunctions in the electronics and the gas supply system to the combustion chamber to representatives of the gas organization.

The boiler also reacts to breakdowns of peripheral equipment or problems with the heating circuit. In this case, it makes no sense to call a boiler repairman.

Would you like to share your own experience in troubleshooting and repairing a gas boiler from Ariston? Do you have useful information on the topic? Please leave comments in the block below, ask questions, post photos.