Gas heating equipment is bought and installed for many years, so the requirements for reliability, durability and fault tolerance by consumers are very high. The equipment of the German concern Junkers meets the most stringent criteria and enjoys a deservedly good reputation all over the world.
Junkers water heaters are floor and wall-mounted, specially designed for operation in Russian conditions. The plant produces economical boilers power from 14 to 42 kW, suitable for heating a house of any size. Each series includes models of both economy class and premium, the price of which is determined by the configuration and advanced functionality. A full two-year warranty applies to all devices. The boilers are compact and easy to install, and the package includes all the necessary parts to connect the device as quickly as possible.
Wall-mounted boilers of the Ceraclass series, with a power of up to 14 kW, allow you to heat apartments and houses up to 150 sq.m. Single-circuit boilers ZS provide only home heating, economically consuming gas. It is possible to connect a boiler to single-circuit boilers. In addition to heating, the ZW double-circuit boiler heats 12 liters of water per minute for the kitchen and bathroom.
The series includes boilers with an open and closed burner, all models are equipped with electric ignition, a three-stage pump, draft and overheating sensors. Boilers can be connected room thermostat, which will maintain the desired temperature in each room. An electronic system and an LCD display informing about the temperature of the coolant, malfunctions and operating mode facilitate the management of the boiler. AT automatic mode self-diagnosis is enabled and a fault log is kept.
Ceraclass Smart - golden mean
Models ZSA 24-2 K and ZWA 24-2 K with a capacity of 24 kW are designed for areas up to 280 square meters, and the second of them produces about 12 liters of water at a temperature of 40-60 degrees per minute. They use all the same functions as in the boilers of the Ceraclass series.
These machines are among the quietest on the market thanks to the right combination hydraulic system and boiler size. As in other series, it is possible to use antifreeze in Ceraclass Smart boilers to prevent freezing of the system.
Ceraclass Excellence - Solutions for Luxury Homes
Power from 24 to 28 kW allows you to heat houses large area, and the ability to connect boilers in automatically controlled cascades allows you to further increase this area. Ceraclass Excellence boilers can be easily integrated into the " smart home”, they can be connected to external weather sensors, separately regulate the temperature of underfloor heating and radiators, controlled by phone or via the Internet, and electricity can be supplied to it from solar panels. The state of the system is monitored by 9 regular security sensors, informing the owner of all violations, which are automatically logged.
The heat exchanger of Ceraclass Excellence boilers is made entirely of copper, which increases the heating rate and the reliability of the device as a whole. The heat exchanger is one of the largest on the market, 18 plates, compared to 14 from other manufacturers, so that water is heated more efficiently. The recirculation function, unique for domestic boilers, allows you to receive hot water immediately after opening the tap, even at the point farthest from the stake.
Floor boilers
Junkers floor boilers are marked K XX-8E, where XX stands for thermal power. They are used in cases where it is impossible to fix on the wall due to its fragility. All boilers are equipped with a high-quality cast-iron exchanger, a burner for any type of gas, an automatic machine with a malfunction indicator and a draft control. The efficiency of these boilers is about 92% at a natural gas flow rate of 3.3 to 6.6 m3/h. The volume of water in the boilers of this series is from 12 to 19 liters. Safety device automatically limits heating, the maximum limit of which is 90 degrees. The boiler has a built-in thermometer and temperature controller.
Since the end of 2012, boilers under the Junkers brand have ceased to be produced. But buyers need not worry high quality still available, now under the Bosh brand.
2017-06-03 Evgeny Fomenko
The device and principle of operation of Junkers boilers
Classic gas boilers
The Junkers company produced several series of gas boilers with a classic device: Ceraclass, Ceraclass Comfort, Ceraclass Exellens and Junkers Euroline. Among them there are models with one and two circuits, as well as with combustion chambers of closed and open type. The devices can operate both on natural gas from a centralized gas pipeline, and on liquefied gas from cylinders.
They are compact and wall mounted. At the bottom of the column body there is a Heatronic control panel with knobs for adjusting the temperature of the coolant and hot water, setting buttons, a pressure gauge and a multifunctional display. In Ceraclass Comfort models, the electronic part is closed from above by a cover.
Devices with closed cells combustion chambers are additionally equipped with fans in the upper part for the forced removal of combustion products and air entry into the furnace. In the center of the boiler is a burner with an ignition electrode and ionization flame control.
Above it is a heat exchanger made of copper or stainless steel. To the right, slightly lower, is circulation pump, which ensures the movement of the coolant through the radiator system. In double-circuit devices, a second plate heat exchanger, which provides domestic water heating.
Condensing gas boilers
Condensing boilers are represented by the Ceraput Smart, Comfort, ACU and Modul series. There are both floor and wall configurations. They are more economical than classical ones due to the use of heat from the condensation of the vapor of combustion products.
Additional elements of such devices are condensate collectors located in the lower left part of the case. Top comes out coaxial chimney, through the central part of which the cooled combustion products go out into the street, and through the outer part oxygen into the furnace.
All Junkers boilers are equipped with the necessary protection devices. Modern models can connect to the system Smart House and controlled remotely. Consider which Junkers gas boiler shows error codes and what to do to correct these faults.
Basic error codes
45
Error 45 may flicker alternately with 90. This is an indicator of insufficient traction. In turbocharged models, it is necessary to check the operation of the fan and the differential pressure switch. AT atmospheric boilers the draft in the chimney and the serviceability of the draft control sensor are checked.
60
Error 60 appears when the control board malfunctions. One of the reasons may be the burning of the resistor next to the ignition transformer. If you are not well versed in the electronic part, it is advisable to contact the service department.
Junkers boiler control board
75
Error 75 indicates a malfunction in the electronic board. Most likely the problem is in the circuits tied to the ignition and combustion control. You may need to completely replace the control board.
90
Error 90 flashes once every four seconds when there is low pressure in the network. The electronic control board may be faulty. If you have problems with electricity throughout the room, buying a voltage stabilizer will help.
A4
Error A4 is displayed when the flue gas outlet is detected on the flow fuse. Check for any obstructions in flue gas evacuation.
aa
Error aa appears when the flow temperature in the heating system is exceeded and the water flow is insufficient for the set power level. It is necessary to check the presence of lime deposits on the plate heat exchanger and in the combustion chamber, to inspect whether the pump is working. Also, the cause of the breakdown may be a malfunction of the NTC sensor.
e2
Error e2 indicates that the supply temperature sensor is damaged. It is necessary to inspect the sensor and its wires.
temperature sensor
e9
Error e9 is output if the flow temperature limiter is activated. Look at the pressure in the system, the operation of the temperature sensor, the pump and the control board. Blowing out the system may also help.
ea
Error ea means that the flame in the burner is not recognized. Check the flow of gas into the column and its pressure, the serviceability of the gas flow control switch. The cause of the breakdown may be a clogged heat exchanger, a clogged drain of the condensate siphon. The flame may not ignite due to lack of draft - inspect and, if necessary, clean the chimney, ensure the flow of air into the room.
с4
Error c4 means that the differential pressure switch cannot open at rest. Inspect the switch, the cable it connects to and the condition of the flexible connecting pipes.
с6
Error c6 is displayed if the fan stops working. It is necessary to check the operability of the fan and the integrity of the connecting wires and plug. If necessary, replace damaged parts.
Other malfunctions
First of all, you need to familiarize yourself with the safety rules when using gas boiler. If you smell gas, immediately turn off the device, close the gas valve and open a window for ventilation. After that, the gas service is called to troubleshoot. 
To enable you to contact service center, entrust the installation and initial configuration to specialists. Spend regularly Maintenance device, this will extend its service life and prevent possible breakdowns.
Junkers boilers - Experts answer questions
Question: The pressure gauge does not work on my Junkers boiler - what could be? The boiler is new. Replaced gauge - same result.
Answer: The channel is clogged, the place where the pressure gauge is connected, no water enters the capillary tube.
Question: The Junkers Euroline 23 boiler stopped turning on stably. It turned out that the gas supply valve was not opening. The reason is insufficient voltage to open. It was 35-37v, you need 60v. Replacing the electronic board solved the issue. Whether there is a electronic circuit this board? On the new board 50 kOhm. The remaining diodes and transistors (without desoldering from the board) give the same readings, i.e. can be considered as workers. Can this resistor with a reduced resistance affect the voltage drop?
Answer: The resistor can hardly influence, but the coil control transistor can.
Question: a couple of weeks ago, an incomprehensible and unpleasant sound suddenly appeared in the boiler: it seems like a ratchet is working in some kind of "organ" of the boiler. It's impossible to tell by ear. But when you touch the gas valve, a sound is clearly felt from there. Although it is possible that sound vibrations are transmitted through the boiler fittings. The sound occurs periodically, regardless of whether only the boiler or hot water is working with it. Has anyone had similar problems with these symptoms?
Answer: It is necessary to thoroughly clean the pump, if you are not confident in your abilities, invite a specialist, the part is expensive.
Question: Problem: DHW heating in the indirect heater does not work, heating is in working order! It just stopped heating and that's it!
Answer: Check the DHW flow sensor
Question: The Junkers zs 23-1 ae boiler is a single-circuit boiler with the possibility of heating hot water in a storage tank! Sensor connected, does not show an error. Doesn't heat water. When restarting, the yellow indicator flashes twice, the first on the temperature display panel, and the boiler goes into standby mode. When the temperature sensor contact is disconnected, the boiler lights up and immediately goes out. Heating works flawlessly. DHW heating worked.
Answer: It is necessary to check the boiler sensor.
Question: Tell me, does water not pass through the boiler to the hot water supply, where to look?
Answer: If you have Junkers Euroline, then at the entrance cold water into the boiler.
Question: Help with this question. The Junkers Evroline zw 23 did a great job for one season, but strange things started to happen this year. After having used cold water when closing the tap, the boiler turns on for 5-10 seconds and goes out. The heating circuit works great. The serviceman said it was a hydraulic problem. This begs the question, why did it work fine before and how to fix it?
Answer: Eliminate? Remove water hammer in the cold water pipe at the boiler inlet when it is closed on the mixer - for example, put a check valve.
Question: Boiler Junkers Euroline ZS/ZW 23-1 AE. Stably, once a year, I have a problem with hot water supply. The point is that when you open faucet to supply hot water, it (water) flows warm, not hot, but at the same time, the batteries get very hot. I call the master and he cleans the valve, which, in his opinion, is clogged with plumbing dirt. I downloaded the instructions for the boiler, but it does not say anything about the procedure for cleaning the valve, so I ask for your advice. To clean the valve, you need complete dismantling the entire node or can it be done without removing it? Maybe there is at least short description such a procedure?
Answer: The 3-way valve can be removed quite easily, after draining the heating water from the boiler, try replacing it if you are tired of repairing it.
Question: There was a problem with the Junkers ZW-23-1 KE 23 boiler, which worked fine, but this winter it all started. At first, the boiler could not turn on normally, turn on-turn off + turn on-turn off + turn on-turn off, and so it could do for 20-30 minutes, as if it didn’t have enough gas to ignite. The DHW was working perfectly at that moment. The serviceman can’t offer anything other than cleaning the boiler, and I tell him, in my opinion, the matter is in the gas part, and so we service the boiler 2 times a year. And yesterday the column started to drive, it turns on, there is a frantic gas noise and after 5 seconds it turns off and cannot turn on normally. It will take some time, then it will work. Tell me where to start?
Answer: clean or replace the ionization electrode. There may be a problem with the board, the board does not see the minimum flame, check the C4 capacitor in the boiler.
Question: The Junkers Evroline zw 23 ke boiler heating is working normally, when the hot water tap is opened, the gas burns strongly (with noise), then the burner turns off and on again. etc. With a slow opening, it seems to be in mode, but it is worth opening the tap somewhere else, everything repeats. The heat exchanger has just been cleaned.
Answer: Check the gas valve settings according to the instructions.
Question: I have a Junkers zw 23 ke 12 boiler. It has been a problem for a month now. I turn on hot water, the boiler starts to make noise and such a sound begins in the pipes, as if they are being beaten with a hammer and the water does not heat up. The fault reset key flashes about once every 4 seconds, but the temperature shows either 90 or 45. What could be the problem?
Answer: If the pressure in the boiler is correct and the pump has not jammed, the heat exchangers are definitely flushed. Also check the air vent and volume compensator.
Question: Junkers Euroline ZW23KE boiler (installed 10 years ago). After a thunderstorm, red and green flashes 75. What could be? Payment refused?
Answer: See flame control circuit.
Question: Boiler Junkers Euroline 23-1. Turbine. The error is as follows: The fault reset button is flashing, and the diodes are 45 and 90 degrees. According to the instructions - the pressure sensor does not work. If I understand correctly, the pressure sensor is the same pressure switch? I tried to reset the error via RESET, but the result is the same. He removed the case, blew the venturi tube, also blew into the pressure switch, maybe the contacts were somehow stuck, they clattered normally. Then, through the reset button, he removed the error after all and the boiler started up. But after half an hour again the same picture. Tell me what it could be and how to check. Maybe for resistance or whatever ... (there is a multimeter). Or is it a pay thing. Or buy a new pressure switch?
Answer: 1 - check the moment of the accident - whether the turbine is working, 2 - if it works, then check the voltage at the pressure switch with a tester should be 0.
Question: The pressure sensor stopped responding, unscrewed it, blew it with water pressure - it works, put it in place, filled it with water, does not show. I unscrewed the sensor, when the system is filled with water, there is no water in the place where the sensor is connected, I fill it, the bypass works, and no water flows at the sensor connection, unscrewed the plug located below, blew everything clean. What needs to be done to get water into the sensor?
Answer: clean it.
Question: Such a problem - the Junkers Euroline zw-23 KE 23 \ 21 hot water boiler works fine, after turning on the boiler, it works for heating for an hour or half an hour and turns off, after 3-4 hours it turns on and again the same story. Once, when I opened the tap for adding cold water to the system, the boiler started to work, after shutting off the tap, it immediately turned off. please tell me what could be the reason.
Answer: you need to check everything, I would start with the NTC sensor.
Question: I have a Junkers Euroline boiler. In operation for 5 years it worked fine, but recent times it started badly on heating, there is an arson flash of gas and immediately goes out, then after 10-12 seconds everything repeats and so 6-10 times until it starts. It looks like it won't open gas valve. Can you tell me what needs to be done to fix this?
Answer: Clean the ionization electrode and possibly repair the board.
Question: Tell me, who has come across this: when hot water is started, the boiler lights up, but after a time of 1-10 minutes it turns off and the first light flashes. Then the boiler can be started only after turning off the power for a couple of minutes. What could it be??
Answer: NTC supply pipe or pump.
Question: There is a Junkers Euroline ZW-23-1-AE turbocharged boiler. The turbine is very loud. When inspecting the turbine, I found a rather large armature play (1.5-2 mm). The inner bearing rotates with a slight extraneous sound, but the loud sound comes from the play. The reason for the appearance of backlash, I thought, was the displacement of the inner bearing along the armature axis. But it is mounted very tightly, weak (so as not to damage the bearing) attempts to move it along the axis did not lead to anything.
In this regard, questions:
1. In general, is it possible to change the inner bearing of the turbine, or does no one practice this?
2. In the case of a turbine replacement, can you put in a not so powerful one so that it does not buzz so much? I have a 50W turbine, maybe there are 25-30 watt turbines. The heated area is about 60 m, the boiler always operates at minimum power.
Answer: Backlash is not from the sound of the turbine! If you can, change the bearing.
Question: Junkers euroline turbocharged boiler. Heating decently fulfills, but the hot water supply is naughty. In the drawdown mode, it heats both hot water and heating. Replaced the 3-way valve insert with a new one. The drive is running DHW heating. I washed the secondary heat exchanger from the heating side - there was garbage, but not critical. I removed the 3-way drive, pressed the stem all the way - the result is the same, both hot water and heating work. Give advice.
Answer: Incorrectly assembled three-way valve, trash.
Question: Good afternoon everyone. I have a Junkers Evroline ZW23KE boiler installed. Now the following problem has appeared: on heating, the burner operates in medium mode, and with hot water supply (the temperature regulator is in a position above the average), the maximum flame immediately turns on, the heat exchanger starts to make noise like a kettle before boiling. The temperature on the indicators reaches 90 and the gas supply is turned off. The flow of water lowered the temperature - the gas turns on and everything starts from the beginning. If the DHW regulator is in a position less than the middle one, the maximum flame is turned on, then the flame decreases to the middle one and then it works with a constant change in the flame (either increase or decrease). I suspect it's time to clean the plate heat exchanger. In 8 years of operation, it has never been cleaned. But since I am not completely sure of my conclusions, so I decided to consult with you. Have I identified the problem correctly?
Answer: And the primary heat exchanger also needs to be cleaned.
Question: Junkers euroline. The pressure switch does not work. You pull with your mouth - it works. The turbine is spinning, but there are no vacuums on the tubes ... The exhaust pipe is in order. Not blocked anywhere. Is the turbo blowing too hard?
Answer: Replace or blow out the venturi, adjust the pressure switch.
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OPERATION AND REPAIR OF BOILERS
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