Heating systems for country and country houses. Boilers, geysers, water heaters - Repair, service, operation. Recommendations for assembly and installation. What to look for when choosing a gas boiler Master Gas Seoul Gas boilers master gas seoul

Mounted boilers operate on natural and liquefied gas. They have a built-in programmer, which makes it possible to program the operation of the boiler, from one day to a week.

All about mounted boilers of the manufacturer

The wall-mounted double-circuit gas heating boiler Master Gas Seoul is distinguished by its compact size and thoughtful design. The equipment has the following technical characteristics:

Rostekhnadzor issued a permit to operate the boiler, which is valid for all modifications of Master Gas Seoul. As a result, the registration of equipment and the preparation of project documentation are carried out without any difficulties.

What are the main features of the installation

To ensure the normal operation of the boiler, it is necessary to comply with certain requirements of the manufacturer regarding installation:

The first start-up of the station must be carried out in the presence of a representative of the company selling the boiler. He will check the correct installation and settings and put the boiler under warranty.

Benefits of the brand Master Gas Seoul

Korean equipment invariably pleases the consumer with its quality, thoughtful functionality and cost. Just recently, the models of boilers Master Gas Seoul passed the certification of Rostekhnadzor and received a permit for operation.

The cost of products is specially supported in the middle price segment, despite the fact that their functionality models are more reminiscent of "premium" class equipment.

The rules for operating the boiler are quite simple in execution. The manufacturer has adapted the internal device for operation in the territory of the Russian Federation.

In the basic configuration there is everything necessary for the operation of the equipment: a built-in circulation pump, an expansion tank, a safety group and automation. After connecting to the heating system and installing a coaxial chimney for the boiler, you can start immediately.

Korean boiler or European?

It should be recognized that if just a few years ago this question could only be answered in favor of a European manufacturer, now, as sales reports show, more and more buyers choose Korean equipment. There are several reasons for this:

There are a lot of service centers.
Attractive value.
Ease of use.

Although, the championship of popularity is still occupied by boilers of Czech and German manufacturing companies, but Korean products are gradually gaining ground. Therefore, a significant increase in the number of sales can be expected in the near future.

Boilers Master Gas Seoul are practically in no way inferior in terms of functionality and ease of use to products from leading manufacturers, but the main attractive quality for domestic consumers is their price.

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The Korean mounted gas boiler Master Gas Seoul is a good and inexpensive alternative to German and Czech models. The equipment is fully adapted to the operating conditions throughout the Russian Federation. Mounted boilers operate on natural and liquefied gas. They have a built-in programmer, which makes it possible to program the operation of the boiler, from one day to a week.

All about mounted boilers of the manufacturer

The wall-mounted double-circuit gas heating boiler Master Gas Seoul is distinguished by its compact size and thoughtful design. The equipment has the following technical characteristics:

What are the main features of the installation

To ensure the normal operation of the boiler, it is necessary to comply with certain requirements of the manufacturer regarding installation:

Benefits of the brand Master Gas Seoul

The cost of products is specially supported in the middle price segment, despite the fact that their functionality models are more reminiscent of "premium" class equipment.

The rules for operating the boiler are quite simple in execution. The manufacturer has adapted the internal device for operation in the territory of the Russian Federation.

Korean boiler or European?

There are a lot of service centers.
Attractive value.
Ease of use.

The double-circuit gas wall-mounted boiler Master Gas Seoul with forced circulation of water flow is represented by a series of specimens with indexing 14, 16, 21. The numbers after the name indicate the maximum parameter of the heated area. Respectively 140/160/210 m2. The Korean manufacturer has a reputation as a conscientious and responsible supplier of high-quality gas heating equipment for private and industrial use.

Gas wall-mounted boiler Master Gas Seoul. Specification of technical parameters

1. General characteristics:

The fuel used is a propane-butane mixture in liquefied or in-line form.
The recommended working pressure of the incoming gas is from 1.3 to 2.9 kPa.
Consumption of gas mixture max / min 1990/620 l/h.
The nominal value of thermal conductivity in the heating circuit is from 14,000 to 21,000 W.
Thermal conductivity in the HBC circuit 20 900 W.

Efficiency at rated power 92%.
Efficiency at power 30% - 95%.
Heating output adjustable from 1.7:1 to 2.6:1.
Forced extraction of combustion products.
The fluid-coolant is water.
The circulation system for liquid is hermetically forced.
Ignition mode - electronic ignition.
Automatic support for temperature parameters.
Information of temperature readings is displayed on the LCD display.

2. Characteristics of the heating circuit of the gas wall-mounted boiler Master Gas Seoul:

Adjustment of temperature range from 40 to 80 degrees.
The working head (pressure) of water in the system is from 100 to 300 kPa.
Water pressure max 0.3 MPa.

3. Parameters for the Master Gas Seoul hot water circuit:

Consumption of water mass with an increase in temperature by 25 C 11.5 l/min.
Adjustable temperature range from 37 to 60 C.
The water pressure in the system is from 15 to 1000 kPa.
Min water consumption at start 2.5 l/min.
Min. water consumption for finishing stop 1.5 l/min.

Operating modes of gas wall-mounted boilers Master Gas Seoul

Gas wall-mounted units Master Gas Seoul No. 14, 16, 21 allow you to perform different operating modes: heating and DHW, DHW only, frost protection, emergency mode and timer mode.

1. The heating and DHW mode turns on automatically when the unit is connected to the power supply and the “power” button is pressed. The display shows the corresponding icons, detailed in the instructions for each model. The adjustment buttons set the required temperature parameter in the heating circuit. Pressing the buttons leads to the flickering of the heat carrier temperature display. The end of the setting leads to the automatic maintenance of switching the boiler on and off.

Mode change is made by a special button "mode selection" on the control panel.
Setting the temperature value for the DHW circuit is done with a special button. The parameter value selected as the main one is displayed on the right side of the LCD screen. The accuracy of temperature setting falls within the range: from 37 to 45 degrees, the run-up is +10С, from 45 to 600С, a run-up up to +50С is possible.
Automatic hot water supply occurs from the moment the “hot” tap is opened.
Closing the tap automatically brings the system into heating mode.

2. The activation of the frost protection mode is set by pressing a special button.

The mode comes into force from the moment the temperature drops below + 50C.
The burner is switched on at the inlet and operates until the water temperature rises to 400C.
The protection mode is used in the event of a long absence of a tenant in the house, as an economical mode for gas or electricity consumption.

3. The mode of switching on only HBC, with the heating mode turned off. This mode allows you to use the boiler in the summer as a gas water heater. When the DHW mode is set, the boiler works to produce hot water.

The transition is made by pressing the "mode selection" buttons until the indication disappears from the screen and the temperature indicator in the DHW circuit flashes. The plus/minus buttons set the selected temperature parameter. The error of the value depends on the run-up of the temperature range and ranges from 10C to 50C.

4. The timer mode provides for the cycling of the installation. The cycle lasts 15 minutes, then there is a pause in the operating mode.

The duration of the pause is set by the owner independently from 1 to 6 hours.
During operation, the water heats up over 800C.

5. Emergency operation.

This mode is intended for a short period of time, for extraordinary cases: failure of the control panel, malfunctions in the heating system, when the pressure of gas and water drops.
The transition to the mode is made when the faulty remote control is disconnected and the wires are connected to each other.
The boiler starts to work in the heating and hot water mode, the set temperature in the circuit is maintained.

Recently appeared on the market and quickly gained popularity, individual heating units of the Master GAS Seoul brand are the product of successful and fruitful cooperation between the Baltic Gas Company and DAESUNG CELTIC ENERSYS Co., Ltd from South Korea.

The series is represented by compact gas boilers with two circuits for wall mounting, of various capacities, with a closed type combustion chamber. The devices are designed to create systems of individual heating and hot water supply in apartments or private houses of a small area, up to 350 square meters.

Gas boilers Master Gas make it possible to effectively regulate the intensity of heating with high accuracy. The units are equipped with separate heat exchangers for the heating and hot water circuits.

Seoul gas heating boilers are attractive for their moderate appetite, they consume very little electricity, no more than 130 W / h. The heaters are quite compact, so they can be mounted in almost any, even a fairly small space.

The whole series of boilers is equipped with an automatic diagnostics system, a multi-stage safety system for operation.

The undoubted advantage of Seoul devices is their adaptability to work on liquefied gas. This is true for cottage or holiday villages that are not equipped with centralized gas supply.

The developers have provided for the possibility of installing a coaxial or conventional type chimney using a universal adapter kit.

Individual boilers Master Gas are equipped with a remote control with a digital display, which allows you to comfortably and conveniently control the operation of the heating system of your home. In addition, it is possible to connect to the "warm floor".

Seoul gas boilers are manufactured at factories in South Korea and are fully adapted to Russian standards. They have the necessary quality certificates and comply with state standards.

The manufacturer guarantees its products for 2.5 years.

Here are some additional benefits:

forced removal of combustion products;
constant control of the burner flame height depending on the required heating temperature;
the ability to connect several remotes to control the unit from different rooms;
control and diagnostics of the state of the boiler, indication of errors on the remote control;
stable operation with a decrease in pressure in the water and gas supply circuits;
stable operation during power supply voltage surges up to 30%, thanks to the built-in voltage stabilizer;
automatically controlled boost circuit for optimal combustion air supply;
copper heat exchanger for the heating circuit to improve the heat transfer coefficient and increase the durability of the module;
a device for automatically blocking the gas supply in case of overheating of the coolant, attenuation of the burner, power outage or malfunction of the chimney;
automatic release of pressure in the heating system when the permissible limits are exceeded.

Gas wall-mounted boilers Master Gas Seoul are represented by models with digital indexes 11, 14, 16, 21, 30 and 35

They differ from each other in power and area of heated premises. They have a built-in frost protection function. All boilers of this series are convection, double-circuit, flow type and equipped with electronic ignition.

Master Gas Seoul 14 heats an area up to 140 sq.m. Boiler power 14 kW, fuel consumption up to 1.99 m³/h

Master Gas Seoul 16 is designed for hot water supply and heating of an area up to 160 sq.m. Power output 16 kW gas consumption up to 2.11 m³/h

Master Seoul 21 is similar in function to its younger counterparts, but more powerful - 21 kW at a gas flow rate of 2.11 m³ / h

More detailed specifications are shown in the table below.

In operation, the gas boiler Master Gas Seoul, there were questions. I fixed two thermometers next to the remote control and the readings on them coincide, but on the remote control. When in the apartment 22 gr. on the remote control 24gr., and when in apartment 24 on the remote control it is already 27. How can this be fixed? Maybe someone knows how to get into the remote control menu with high rights? Once in the menu, as described in the instructions, it is impossible to change the boiler power, however, like many other settings.

The settings in the remote control become available when you turn on switch block No. 3.

Malfunction of the gas boiler Master Gas Seoul 16. We have been using it for 2 months. There are already problems with ignition. The claps are sometimes so strong that it becomes scary.

Obviously, the gas workers connected the gas, but did not set the pressure.

In general, there are many issues with heating: both the rumble and the periodically appearing white smoke (steam?) From the chimney, and, most unpleasantly, the regular pressure drop in the system. Water has to be added every ten days. There are no visible leaks, it is possible to sin on the insufficiency of the built-in expansion tank (due to lack of funds, I hung up the existing Soviet-made steel panel radiators, so it is quite possible that the volume of the coolant is more than the recommended 50 liters), however, there are no jumps into the red zone and discharges of extra pascals after that . I don’t want to admit it, but, perhaps, the only, in my opinion, correct assumption is a malfunction of the boiler heat exchanger (crack) due to which water constantly seeps into the combustion chamber, as a result of which pressure drops in the system, and white smoke comes out of the chimney. I would be very grateful to everyone who will express their opinion.

One of the reasons is that the coaxial chimney is not installed correctly (no slope) and condensate enters the combustion chamber and, again, incorrect gas adjustment.

A wall-mounted boiler Master gas Seoul for 140 kW is connected in a one-room apartment. The builder poured ordinary water into the heating system. I had no previous relationship with this technique, so a few questions arose. I want to fill the system with distilled water. After reading, in principle, I understood how to do it: we pump it through the inlet fitting of cold water, which is suitable for the device, open the make-up valve and wait until the coolant is pumped into the system and, accordingly, the required pressure appears. Then we block the whole thing synchronously, bleed the air and start the boiler. Please correct me if I'm wrong. During operation, the water will still evaporate a little, and the pressure will drop. To raise it, I just need to open the make-up valve and then the water from the line will replenish the system to the desired pressure? According to those passport, unit
requires connecting the electrical part through a power stabilizer. I want to hear opinions on this matter, whether this condition is critical. I understand that there is a microcircuit inside that is afraid of voltage drops, but still? I want to put a filter on the cold water line in front of the boiler. Advise, at least which one to choose, maybe special filters are used here?

There are 20 liters of water in your heating system. And this will not cause problems if you do not pour the same amount or more every day. Better check for leaks.

When the Seoul 14 gas boiler is operating on the air temperature sensor, it turns out somehow crooked. The sensor is lying, and the error is not linear. The temperature in the room ranges from 22 to 24, and on the remote control 26 (the thermometer is next to the remote control, and away from the battery). During the pause, the batteries cool down completely, and smudges may appear on the winding from constant heating-cooling drops. You have to adjust the water temperature of the system when working on the air sensor, and in this remote control, unlike Navien, this is not convenient. In general, the temperature in the apartment is more stable, and the batteries are always hot when the boiler is operating at the temperature of the water in CO, as long as there are no strong temperature changes outside. Ideally, it would be if the water temperature of the system was automatically corrected from the air temperature in the apartment! Here's how to do it?

Although theoretically, if you take a PID controller for MEO with a resistance thermometer, connect it to the remote control buttons, the boiler can work out according to the temperature in CO. With a large integration coefficient, the controller will be more inert, waiting for a change in the signal from the sensor. You just need to think about a circuit that will duplicate the output of the regulator to the remote control button, you need two presses on the remote control button.

Tell me, what is this heating system tap and where can it be shut off? Because the water from the DHW circuit does not match the one set on the remote control (much colder, not even 60 degrees hot). Or maybe someone has experienced this?

Taps on the heating system are mounted in front of the boiler - on the supply and return. The water flow is big. The gas pressure is low.

Set to 11 kW. The pump is noisy and hot. The temperature of the pump is 2 times higher than that of the carrier. But the hand endures. This is fine? Several times gave an error pump A3. Where to bleed air from it? Can't find a plug. Or do I need to open the air vent? And How? Can he run dry?

There is no plug, but you can open the air vent.

In operation, the wall-mounted boiler Master Gas Seoul 16. Tell me what to do: the pressure is on the verge of the minimum allowable (about 1 bar), when the feed valve is opened, it does not increase or slightly sometimes increases (1.1 bar). What could be the reason? And it still hums a lot. The pressure in the water supply is like 4.5 atmo, if that.

As for the first one, maybe the recharge system is clogged, you need to look at what exactly, how the expansion tanks behave, and does the pressure gauge show exactly? As for the second, if it is buzzing, you need to find out that the pump or a clogged heat exchanger is buzzing. Go to the remote settings value P8 from 31 put 20 in the passport according to the table typo. The buzz will pass.

Malfunction of the Master Gas Seoul 16 boiler, error AA constantly pops up, sometimes A4. It turns out that it boils, and when it boils, the pressure gauge for heating goes off scale. Water pressure through the boiler is 2 times worse than cold water. What could be?

If it boils, it means that the water flow is poor, check the system or the Primary heat exchanger is clogged. And the fact that the pressure increases, it will be so, since when it boils, it rises, and see the DHW heat exchanger.

In operation, a gas boiler Boiler Seoul 14. Tell me what to do. According to the passport data for the boiler, the minimum water flow in the system to turn on the boiler in the DHW mode is 2.5 l / min, and it turns on for me at a water flow of 6-7 l / min (I made measurements in practice), in addition, this is an increase in water consumption . The service people say there is nothing they can do. Is not it?

Maybe the DHW flow sensor is wedged, if it is possible to disassemble it and check it, I think there should be nothing complicated there, or it may be defective.

Called a serviceman from Gorgaz. The problem was solved by adjusting the maximum pressure. However, with the recommended value of 55, I had to set it to 40, otherwise the hum would not go away. Again, it is not clear how this will affect the set and maintenance of the set temperature in winter. And for these models, it turns out that regularly, about once a year, the valve for switching from heating to hot water is damaged.

The primary heat exchanger is clogged. Rinsing is needed.

A gas boiler MG Seoul 14 with a closed heating system was installed and connected, I did not see how antifreeze was poured. In general, after the time has elapsed while gas was being processed, the pressure dropped, and the boiler does not start, how to increase the pressure?

Look, there should be a tap, but in general you need to find out from the people who were involved in this, or at least be present at the first start, so that such questions would not arise later, but look - it should be like this, a pump will be needed.

Malfunction of the gas boiler Master gas Seoul 21 with a water heater. In December it will be two years since he has been working. Broke down 3 times already. Error A4. Replaced the heat exchanger for the first time. They said that it got clogged up because someone opened some kind of tap there. And he installed it. In the spring, when the boiler gave the same error, another master arrived, turned it on, adjusted the pressure, and the device started working by itself. Now again this error. We already washed the previous heat exchanger in case of replacement. We have water filters at the entrance. Tell me, is this the norm, that in 1.5 years of service we have already repaired it 3 times?

The wall-mounted boiler Master gas is buzzing, how to switch the control board to service mode, otherwise it does not work from the remote control.

There are three micro-toggle switches on top of the board, move the top two in the opposite direction and go to the settings, then put them back in place.

Tell me what could be: the third day, water drips heavily from the tube below and the pressure drops? Yes, and air appears in the first battery. Maybe the air vent is clogged? Can it be fixed or just a replacement? Boiler Seoul-14, three months old. Works intensively for a week (frosts), works according to air temperature.

Hit the air vent with a screwdriver, it will close and it will not drip.

Tell me, the value of "setting the fan speed" (forced minimum combustion) in the L2 passport is 40. Today I compared all the parameters with the passport, L2 is set to 36. Leave or set as in the passport?

If the minimum gas pressure on the boiler burner is lower than the one set by the manufacturer, the gas consumption will increase!

Malfunction of the Master Gas Seoul 21 boiler. They put it in the spring, it worked fine, in the winter it began to hum strongly, and if you press the lid with your hand, the hum disappears a little. Turned off several times with an A6 error. However, when restarted, it worked fine. But the hum is present, I don’t even know what to do. And by the way, can the hum come from the fact that the pipes for heating are PP 20? Also tell me: what are the settings for P8 for 16 kW?

In the passport - 20, in fact - 31.

Already several times breaks the boiler filter (which is under the pressure gauge). Everything seems to be in order, the pressure in the CO is normal, there are no errors either. It heats up normally, according to the settings, and hot water is also in order. Knocked out, screwed the filter back in, added water - everything is in order again. Last year, a friend had the same problems - he finished breaking until the control board was flooded - they replaced it and everything worked out. The device is already 3 years old - there were no problems - only air was pumped into the expander sometimes. Tell me, please, what to do?

Does anyone know how to increase the power of the boiler? When I bought the boiler, the seller said that it was supposedly possible to make the boiler from the 16th to the 21st with a switch on the board. Is it possible? Do all models have the same controller board? Can you reflash the controller? Somebody clung to the controller?

Can you tell me where the air intake plug is located?

On the top of the boiler, next to the coax with 3-4 self-tapping screws.

Regarding the hum during ignition, it worked fine for a year, after which it slowly began to appear. I called the master, set it up, the hum decreased, but did not disappear at all. The chimney is installed correctly. A problem arose: error A3 began to appear, the boiler stops working, and the error occurs only at night, during the day everything is in order. I realized that the error is related to the pump. What could it be? The appearance of the A3 error has become more frequent, annoying,
as the boiler is turned off. Who will help to solve the problem, who did not encounter this error? All the same, this error with the pump or fan? It's not clear in the instructions.

You need to adjust the minimum and maximum gas pressure, clean the fan. Jump the contacts of the water pressure sensor and observe the device, if there is no A3 error, then the microswitch on the sensor may simply fail, or something is wrong with your water pressure.

In operation wall-mounted boiler MG Seoul. The problem is that at a set temperature of up to 65 degrees, the ignition became poor, namely when it starts to buzz, then it tries to ignite several times, but not the first time, I wait 30 seconds, the burner starts to burn everything is fine. After it turns off, everything repeats. But at the set temperature above 65 degrees, it works properly, it ignites clearly. Same thing when I turn it on
hot water, I also wait for some time until the ignition occurs. Tell me what can be?

Poor ignition - or ignition power, depends, among other things, on the minimum gas pressure on the burner, as well as the ionization electrode itself - its cleanliness and position in the combustion chamber. Clean the burner. Clean the fan. Check the network voltage. Check the pressure on the burner, adjust. Check the surface of the heat exchanger, clean it. General maintenance needs to be done.

Malfunction of the Master Gas Seoul boiler. Error A5 (low water pressure). According to the instructions, the working pressure is 1.5-2.0 bar. The minimum type is 0.5. The first season he worked well, and since there was no water supply in the house, water was pumped up by a pump from a common street water supply. (As the pressure drops closer to 0.5 bar, I pumped it up). For the second season, I connected it to a well (hard water) and by the end of the season, problems began. As soon as the pressure drops closer to 1.3-1.4 bar, error A5 (boiler restart without adding water and it continues to work for a certain time). Maybe someone will tell me, I suspect that something with the pressure sensor. Can turn it off and close the wires (who knows how it works?). Or maybe the air vent has soured, before droplets dripped from it, now it's dry. Over the entire history of use, the water pressure drops somehow quickly. I looked through all the pipes and connections, but did not find any leaks. That is, recently I pump up the pressure from 1.5 to 2.0 every three days. And yet, the pressure in the empty expansion tank should be 0.09 MPa, how much is it in bars.

1 bar - 1 kilogram approximately, the pressure sensor is on the tube, 2 wires, put a jumper between the wires, and ideally, the sensor should be replaced or removed and rinsed well.

Boiler malfunction Master gas Seoul 14. Worked for 2 years 4 months almost without complaints, the only thing was that he regularly added pressure (it constantly fell although there seemed to be no leaks), and a week ago he switched it to DHW mode, worked a little and gave an A4 error, turned it off from the outlet , turned it on again - it worked. In the morning I turned on the hot water, again the boiler buzzed strongly, the pressure gauge needle ran up and down and the A4 error, they say to clean
you need heat exchangers (I have never done this anywhere, no matter where the instructions are, the procedure for how to do it all yourself is not difficult), but when I turn it back on with the heating mode, everything works fine, why is that?

Help me understand the operation of the Master Gas Seoul 14 boiler. The problem is that when hot water is turned on, hot water goes into the heating system, and cold water runs out of the tap. And the pressure keeps dropping. The system does not run, I checked it repeatedly. I thought about a three-way valve, but I read somewhere that the reason is not in it, but they don’t say anything intelligible either.

1. change the three-way valve.
2. pump air into the expansion tank.

In operation, the MG Seoul 14 gas boiler, it buzzes when ignited. "Cold" noise is stronger, warm - less. The walls of the boiler during the hum vibrate strongly, if you find a point on the wall and clamp it, the hum becomes an order of magnitude smaller. The fan is clean. There is a feeling that the hum is directly dependent on the amount of air flow. I assume that the reason is acoustic resonance. Adjusting the fan speed through the settings affects only indirectly and does not completely eliminate the hum.

The hum can be caused by the separation of the flame from the burner. There are many micro-collapses that cause resonance at a certain frequency and produce a hum. Flame separation, in turn, occurs due to a mismatch between the gas supply (its pressure) and the air velocity. I made a pressure gauge, adjusted the maximum and minimum according to the instructions. The operation of the boiler has changed. After ignition, the device gradually adds pressure to the cold one. At some point there is a hum. The device immediately abruptly drops the pressure to a minimum and works on it for several minutes (there is no hum at this stage, sometimes it was before adjustment). Then he again begins to add pressure little by little. Again, at a certain point (the pressure approaches 80% of the maximum according to the passport), a hum appears. Again, it lowers the pressure a little, and then slowly raises it again, as if trying to approach the border where the hum occurs, but not to allow it to occur. It seems that the "brains" feel the buzz, and try to set the maximum possible pressure without the buzz. But how do they feel? I don't see the sensor. It's just a thrust sensor. It would seem that the connection between pressure and hum is obvious. When a certain pressure is reached, a hum appears. But no, there is almost no hum in the heating and DHW mode, although the pressure is almost twice as high as the pressure in the heating mode, at which there is a hum.

Water is constantly dripping from the air vent and the pressure is released. There is a faucet with a rubber ring. What is the normal position of this faucet? It must be closed or open. And if it's open, then how to set up a pressure relief or valve only for replacement? I'm not afraid to disassemble a trifle, I knocked with a screwdriver, tapped and patted, it still flows. The pressure is normal, including in the expansion tank.

Remove the air vent, disassemble and clean. Somewhere brought up or deposits due to water do not allow the float to fit snugly.

In operation wall-mounted boiler Master Gas. The boiler works normally for heating, when I turn on hot water, after 15-20 seconds a noise appears in the boiler (as if it is sucking water), the flame in the boiler turns off for a few seconds. This is accompanied by a second jump in pressure upwards (then it returns back), hot water, of course, also stops flowing. Then everything is fine, and after 15-20 seconds everything is the same, etc. I did
maintenance, nothing has changed. The device has been in operation for less than a year and a half, the heat exchanger was cleaned, the water is ordinary, the master was, he said tough. Now, after the service, there is no pressure jump and pop (at first, although there was, yesterday I wanted to shoot this moment and still there is no pop of this, the pressure arrow just twitches a little and the flame goes out). Hot water comes out of the tap for a short time, then immediately cold, then barely warm, then again a little
hot, continue in the same order. I noticed when the flame goes out, the AA error pops up for a few seconds. That is, something with the pump means or damage in the three-way valve, guided by the instructions, because the filter is clean.

It looks like a hot water heat exchanger. Apparently it needs to be changed.

The Seoul 16 boiler is installed and connected, when the DHW is turned on, a crack occurs in it, the pressure arrow jumps and error A4 is displayed. Need to replace the secondary or three-way valve heat exchanger? Hot water flows, but the boiler goes out and everything is an A4 error, that is, when the mountain tap is opened. water, a crackling is heard from it, an arrow jumps and the boiler goes out, and it still stood for a week in winter mode, no one touched it and again a mistake on the floor? Temperature on
DHW installed 55.

This is the overheating of the heat exchanger. In the secondary scale, which prevents the normal transfer of heat from the heating circuit to the hot water supply, that is, it does not heat up to 55, and the device regularly tries to complete the task and raises the temperature, which leads to overheating and triggering of the corresponding sensor, it turns off.

Recently appeared on the market and quickly gained popularity, individual heating units of the Master GAS Seoul brand are the product of a successful and fruitful cooperation between the Baltic Gas Company and DAESUNG CELTIC ENERSYS Co., Ltd from South Korea.