This article contains all possible malfunctions and options for eliminating them, as well as error codes for Bosch boilers. All information is read in the following order: code - name - possible malfunction. If you have any problems additional questions, please leave them in the comments to this article.
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The list below shows faults specifically for Bosch Gaz 6000 series boilers. Determine the error code and fix the problems in a timely manner.
Check the boiler sensor and connection wires.
Check the differential. pressure switch.
Check the fan, wire and plug. Replace if necessary.
Add water.
Check the sensor for defects, as well as a possible short circuit in its wire. Replace if necessary.
Although the boiler is turned off, a flame is detected.
After turning off the gas supply, a flame was detected.
Set the boiler type.
Below is a list of faults specifically for Bosch boilers of the ZSC / ZWC 24 MFA series. Identify the error code and troubleshoot in a timely manner.
Check for damage or short circuit of the temperature sensor and its wire, replace if necessary.
Check connecting cable and regulators.
Check the installation area, if necessary, remove the sensor and reinstall it using heat-conducting paste.
Check the boiler sensor and connecting cable.
Insert the coding plug correctly, measure it and replace it if necessary.
Check the differential pressure switch, exhaust device and connecting pipes.
Check the differential pressure switch.
Check the differential pressure switch and flue gas pipes.
If there is a jumper, insert the plug correctly and check the external limiter. Otherwise: is there a jumper?
Check the pump, bypass hose and system pressure.
Check temperature sensor and connecting cable.
Check the pressure in the system, temperature sensors, check the operation of the pumps and the fuse on the electronic board, remove air from the device.
Is the gas valve open? Check the pressure in the gas network, network connection, starting electrode with cable and ionization electrode with cable.
Check the connection of the electrical plug contacts and start lines and, if necessary, replace the electronic board.
Check electrodes and cable. If the flue gas exhaust works, check the electronic board for moisture.
Check the ionization electrode. Check gas fittings.
Press the button again for less than 30 seconds.
Check the outside temperature sensor and connecting cable for damage.
2017-04-29 Evgeniy Fomenko
The most popular models among the Bosch boiler line are double-circuit. They are faced with two tasks: the first is heating the room to a given temperature, the second is ensuring hot water for household needs.
Bosch devices, namely the Bosch Gas 4000 W and Junkers Bosch models, are equipped with two independent heat exchangers, which allows them to perfectly perform two tasks: heating water and providing heat in the room.
In each of the models, it is possible to choose the device power that suits you from 12 to 35 kW; the selection takes into account the area of the room. As for heating liquids for household needs, the productivity is about 8-13 liters per minute.
Advantages of a wall-mounted double-circuit boiler:
The boiler can be mounted in the kitchen wall Flaws:
Let's take a closer look at how the device works, using the example of the Bosch Gas 4000 W ZWA 24 model. When the boiler is operating in heating mode, using gas burner heat is transferred to the primary heat exchanger, which is a structure made of copper tubes and records.
To prevent them from deteriorating from exposure high temperatures and water, their surface is covered with a protective layer. Its main task is to transfer the heat generated when the flame burns to the heating system. The movement of water in the system is ensured by a pump.
The design also includes a three-way valve, its task is to prevent water from entering the secondary heat exchanger. A secondary heat exchanger is necessary to heat water for domestic needs. The heated liquid for the heating circuit leaves the device through the heating supply line, and the cooled liquid enters through the heating return line.
When the boiler is set to heat water for consumption, the 3-way valve closes the heating circuit. The heated liquid flows from the primary heat exchanger to the secondary one, and then flows out of the device.
Bosch boiler three-way valve
The advantage when using different heat exchangers is obvious. Often used for heating plain water, and it usually contains impurities. When it is heated, impurities begin to form deposits, which negatively affect the heat exchanger and reduce its throughput, prevent the water from warming up, reducing its service life.
And when the liquid that flows through the primary heat exchanger is in a closed circuit, it does not change its chemical properties, minimizes negative consequences.
The fluid that flows through the secondary heat exchanger will develop deposits over time, and over time the heat exchanger will need to be replaced or cleaned. If the malfunction occurs on winter period, your boiler will be able to operate uninterruptedly in heating mode using the primary radiator.
Like any device, a Bosch gas boiler also sometimes fails and needs repair, let's take a closer look at it possible malfunctions and ways to eliminate them.
Error 11 is possible in the Bosch BWC 42 device, it is deciphered in the same way as error E9, it signals the operation of the flue gas temperature limiter.
Flue gas temperature limiter
You need to do the following:
Error 23 is not an error, this code appears during settings and indicates the type of natural gas used
Error 50 appears on Bosch ZWA 24 models when there is no flame.
Bosch ZWA 24 boiler
How to fix it:
Error 70 means a faulty differential relay during ignition.
Causes and solutions:
Error a2 appears when exhaust flue gases exit the combustion chamber, indicating that the heat exchanger is clogged with soot and fumes. To resolve, clean the heat exchanger.
Cleaning the heat exchanger with compressed air
Error e2 - the temperature sensor on the supply line is faulty. Check the sensor for a short circuit or break, inspect the connecting wires for circuit breakage or oxidation. Strip or connect the wires, if the sensor is faulty, replace it with a new one.
Error e9 means the temperature limiter has tripped.
The causes of occurrence and methods of elimination may be the following:
Error EA signals the absence of flame in the on state.
If this code appears, you should check:
Error er (er) appears if the boiler does not operate correctly when a malfunction occurs in any of the device units.
Error c3 appears on a Bosch ZWE boiler if exhaust gases appear in the combustion chamber. This problem can be resolved by cleaning the heat exchanger according to the instructions in the instructions.
If the differential pressure switch is closed and the fan is off, error c4 appears.
Differential relay
When this code appears, you can do the following:
Error c6 means that the differential relay does not turn on when the fan is turned on.
What to do when this code appears:
Error ce is a fairly frequently repeated code in Bosch gas boilers ( bosch gas) 6000 24 kW and means insufficient pressure in the heating circuit.
Bosch gas boiler 6000 24 kW
The lack of water in the circuit is determined by the pressure gauge:
Error f0 means an internal fault. When it appears, you need to check the reliability of the connection of the terminals and wires to the electronic board. If the wires are not oxidized or the connections are not broken, then this means that the board itself is faulty and should be replaced.
The fd error appears if the button has been pressed for more than 30 seconds. To reset this code, press and hold the button for less than this time.
The se error signals that the heating system is insufficiently filled.
Heat exchanger with scale and after cleaning
What should be done:
The most common error codes were listed above, let's look at other possible faults.
Sometimes the following problems occur:
Gas wall mounted Buderus boilers
Models Logamax U042, U044, GB072, GB172. With open and closed combustion chamber. Methods of repair and service, adjustment of operating parameters. Maintenance recommendations. 
Gas heating boilers Vaillant
Models: floor-standing Atmovit exclusiv, wall-mounted condensing Ecotec plus. Service, Maintenance, settings of functional components. Hydraulic diagrams. 
Gas wall mounted Ariston boilers
Models Clas, Clas Evo, Genus. Recommendations for repair, maintenance and service. Elimination of errors and malfunctions. Setting and adjustment methods. 
Gas boilers Immergaz
Models Eolo Star, Eolo Mini, Nike Star, Nike Mini, Mithos. Repairs and adjustments. Installation, installation and connection. Operating mode settings and additional equipment. 
Boilers Kentatsu Furst
Wall models Nobby Smart. Condensing Smart Condens. Floor standing Sigma, Kobold. Solid fuel Elegant, Vulkan. Malfunctions and error codes. Description and characteristics.
Error codes for Bosch WBN 6000 boilers
A7- Malfunction of the DHW temperature sensor. Inspect the sensor for defects or short circuits and its wiring. Replace if necessary.
Ad- The unit cannot detect the boiler temperature sensor. It is necessary to inspect the boiler temperature sensor and connecting wires.
C1- The fan rotates at low speed. You need to check the mains voltage. Also inspect the flue gas exhaust system and, if necessary, clean or repair it.
C4- The differential pressure switch does not open if the fan is turned off. The differential needs to be inspected. pressure switch.
C6- The differential pressure switch does not close. Check the fan and wires with plugs. Replace if necessary. Inspect the differential. pressure switch and exhaust pipes for combustion products.
C7- The fan does not work. Check the fan and its wires with plugs. Replace if necessary.
C.E.- There is not enough pressure in the heating system. Needs to be filled with water.
d7- Malfunction gas system. Check the connecting wire. Inspect the gas system and replace if necessary.
E2- Faulty temperature sensor on the supply line (break). It is necessary to check for possible damage or short circuit of the sensor and its wiring. Replace if necessary.
E9- The temperature limiter in the heat exchanger is triggered. It is necessary to check for possible damage to the heat exchanger temperature limiter and its connecting wires. Replace if necessary. Check the nominal pressure in the system. Inspect the temperature limiter and replace it with a new one if necessary. Check the start of the circulation pump and, if necessary, replace it. Check fuses, replace if necessary. Remove air from the unit. Check the water circuit in the heat exchanger. Replace if necessary. Check the flue gas temperature limiter for possible damage.
EA- There is no flame. Check the connection of the protection wires. See if it's open gas tap. Check the gas supply pressure readings and correct if necessary. Check the connection to the electrical network, electrodes with wires and, if necessary, replace. Inspect the combustion product exhaust system, clean or repair it. Check the gas adjustment,
eliminate if necessary. For natural gas: Inspect the relay that controls gas flow. Change if necessary. When working with combustion air intake from the room, check the air flow into the room and the ventilation openings. Clean the heat exchanger. Check the gas system, replace if necessary.
F7- When switched off, the boiler detects a flame. Check for oxidation of the electrodes and replace if necessary. Inspect the combustion products exhaust system and, if necessary, clean or repair. Check the electronic control board for moisture, dry if necessary.
F.A.- Flame detected when gas supply is turned off. Check the gas system, replace if necessary. Inspect the electrodes and connecting wires, replace if necessary. Inspect the combustion product exhaust system, clean or repair it.
P- The boiler type is not determined. Set the unit type.
Fd
Bosch boiler error codes ZWC MFA
A2, C3- Exit of flue gases at the combustion chamber. Check the heat exchanger for blockages.
A3- The flue gas temperature sensor is not defined. It is necessary to check the sensor and connecting cables for damage.
A4- Flue gas outlet at the flow fuse. Check the flue gas outlet.
A6- The temperature sensor in the combustion chamber is not detected. It is necessary to check the sensor and connecting cables for damage.
A7- Malfunction of the hot water supply (DHW) temperature sensor. Carry out a check to look for defects or short circuits in the temperature sensor and its wiring, if necessary, replace it.
A8- Contact with the BUS bus has been interrupted. Check the contact cable and regulators.
A9- Incorrect installation of the DHW sensor. Check the mounting distances, remove the sensor if necessary and reinstall it using heat-conducting paste.
A.C.- The module is not defined. The module is not connected correctly. Check the module, outside temperature sensor, remote control and contacts.
Ad- The unit cannot detect the boiler temperature sensor. It is necessary to inspect the boiler temperature sensor and wire contacts.
b1- Coding plug not defined. Conduct correct installation coding plug, measure it and replace it if necessary.
C1, C6- The differential pressure switch does not close. Check the fan and wires with plugs. Replace if necessary. Inspect the differential. pressure switch and exhaust pipes for combustion products.
C4- Diff. The pressure switch does not open in the off position. Check the differential pressure switch.
CC- The control unit cannot detect the outside temperature sensor. It is necessary to inspect the sensor and contact cable for breaks.
d3- Jumper 161 was not detected on ST8. If there is a jumper, insert the plug correctly and check the external limiter. Otherwise: check if there is a jumper.
d4- There is a large temperature difference. Check the circulation pump, bypass hose and system pressure.
d5- The external temperature sensor is damaged. Check the sensor and connecting contacts.
E2- Flow temperature sensor is faulty. Check the sensor and connecting contacts.
E9- A limiter has tripped in the supply line. Check the pressure in the system and temperature sensors. Check the functions of the pumps and the fuse on control board, remove air from the unit.
E.A.- No flame detected. Inspect the gas valve. Check the pressure in the gas network, the network connection, the ignition electrode with the wire and the ionization electrode with the cable.
F0- Internal problem. Check the correct connection of the electrical plug contacts and start lines, and if necessary, replace the electronic board.
F7- The flame is detected when the unit is turned off. Check electrodes and cables. The flue gas removal system may be faulty. Check the control board for moisture.
F.A.- Flame detection after gas supply is turned off. Inspect the ionization electrode. Check the gas system.
Fd- Incorrect button press (duration more than 30 seconds). Press the button again in less than 30 seconds.
Malfunctions and adjustments of Bosch boilers
Wall-mounted boiler Wbn 6000-24. Gas is natural. The EA error has been appearing for a very long time now. After reading about the EA error, I decided to find out the board firmware and fan stage settings. If the software version in the menu shows “245-03” and does not seem to raise any questions, then the fan stage menu shows the number “17”. The chimney system is horizontal with a concentric pipe. The exit from the boiler is about 2 meters. I have not installed any adapter for air intake from inside the room and air enters the unit from outside the room. What guided the masters when installing the 17th fan stage, although, judging by the instructions, the 2nd stage is needed. Do I need to change the board?
No adapter needed. You have a standard coax with air intake from outside. It helps to get rid of this error by setting the fan stage to 5. I had the same thing, and when I set it to 5, there has been no error for a year now.
We recently washed the heat exchangers of a Bosch 6000 gas boiler. It worked for a month and kept the pressure at 1 all the time. Then I noticed a strange gurgling sound inside it before the burner ignited (in cooling mode), as if water was being poured from one mug to another. I looked, and the pressure was 0. In theory, it should have automatically turned off when the pressure in the system dropped to 0.5, but it worked and warmed up the batteries. The only thing was that there was a different sound and murmur. I increased the pressure to 1, but the next day the pressure dropped back to 0.5 (meaning there is a water leak somewhere). I checked the pipes and radiators, but couldn't find any leaks anywhere. The unit also does not drip, but the pressure still drops. Tell me what it could be
problem and where to look for it?
I had a similar experience. There was air in the system and after operation of the device the air came out and the pressure dropped. Is your automatic air vent valve (on top of the pump) not closed? It needs to be always open. It is better to bring the pressure to 2 atm, so that expansion tank I also took the volume in the boiler and compensated for the escaping air. In radiators, of course, you should also bleed air using a Mayevsky valve.
The Bosch 6000 24 kW gas wall-mounted boiler often gives an EA error and often turns on and off. That is, conditionally - set it to at least 40 degrees, literally 5 minutes and turned off, etc. Previously, it heated as it should, but now the first batteries are hot, the distant ones are barely warm, it doesn’t reach them. Operates based on return temperature room thermostat No.
Error EA can be eliminated by setting the fan stage to value 5. The fact that the unit turns off quickly means that its minimum power is too high for your system. It cannot produce less than 8 kW. And you apparently have 5 radiators in the system. So he heats this water and turns off. And why does it heat them up so quickly? The following malfunctions are possible: something is clogged or airy, or the first radiators need to be balanced so that the entire flow does not go only through them. Here you need to look at the radiator diagram and so on. Try setting the pump speed to maximum (value 3) and bleeding air into the radiators.
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Borino, ZhMZ, Siberia, Alfa Kalor, Termotechnik.
Adjustment gas automation Eurosit 630. Replacement of thermocouple and maintenance of pilot burner.
Models Luna, Luna 3 Comfort, Luna Duo Tec (F/Fi). Double-circuit, turbocharged. Recommendations for eliminating errors and malfunctions. Settings and adjustment of operating modes.
Models ZWC, ZSA, ZSC, ZWR, Gaz 5000, Gaz 3000 W ZW, WBN 6000.
Wall-mounted, double-circuit. Repairs, adjustments and malfunctions. Settings for functions and modes.
Deluxe Coaxial, Deluxe Plus, GA models. Errors and problems.
Working with Xital remote control. System control. Adjustment of work by temperature and pressure.
We have such a problem. It's a Bosch double boiler, we've only been using it for six months. We turned on the hot water, but it doesn’t heat up, the boiler knocks out and shows error E9. The filter was cleaned, the device started up, but an hour later it turned off again. Shows an error. When we start it up, the pressure immediately rises and the unit shuts down. Then we turn it on, the fuses immediately burn out and the boiler goes out. We still can’t turn it on. Please help me in
what could be the reason?
Most likely your pump is jammed. Usually the fuses blow because of the pump.
Bosch gas 6000w boiler. Was purchased in August of this year. When the cold snap set in, it turned off and showed error C6 (the differential pressure switch does not turn on). After removing the front cover, it was discovered that the tubes that go to this relay were covered with frost. After drying the tubes, the device started up. This situation has been repeated several times already. Is there any way
get rid of this problem?
You need to look at how the smoke removal system is made. Separate system often leads to such consequences. We recommend replacing it with coaxial. If it is not possible to change the chimney, then the pipes need to be insulated.
Wall-mounted boiler Wbn 6000-24. Gas is natural. The EA error has been appearing for a very long time now. After reading about the EA error, I decided to find out the board firmware and fan stage settings. If the software version in the menu shows “245-03” and does not seem to raise any questions, then the fan stage menu shows the number “17”. The chimney system is horizontal with a concentric pipe. The exit from the boiler is about 2 meters. No fence adapter
I have not installed air from inside the room and air enters the unit from outside the room. What guided the masters when installing the 17th fan stage, although, judging by the instructions, the 2nd stage is needed. Do I need to change the board?
No adapter needed. You have a standard coax with air intake from outside. It helps to get rid of this error by setting the fan stage to 5. I had the same thing, and when I set it to 5, there has been no error for a year now.
Tell me, does the burner activate modulation only when using a thermostat or in some other cases?
When the coolant temperature approaches the set modulation, the boiler turns on in any case, regardless of whether there is a thermostat or not, but since this process takes little time it is difficult to fix. If an OT thermostat is used, modulations begin to occur when the room temperature approaches the set temperature. If the thermostat is set to “On/Off”, then there is no connection.
Private house 70m2 300mm foam block 50mm mineral wool and facing with ceramic bricks. There are plans to expand the area by another 50-60 square meters. m. On the ground floor, a 33m2 heating substation is installed, heating radiators are installed on both floors. DHW is provided by the kitchen and bathroom; in the future there will be a second bathroom. I want to install BKN Drazice 125. Since my house has a riser installed, I plan to install a wall-mounted gas boiler with
coaxial chimney. Considering different variants. The most optimal for the price is the Bosch 6000 (18 kW), but the bosch gaz 7000 has a minimum power of 24 kW, which, I think, is too much for me. What is important is that I need the boiler to be able to set the temperature in the boiler and, in the future, to be able to install a room thermostat and an outdoor sensor. Interested
Is the difference between the indicated models in the composition of components or in the place of assembly? Maybe there are some other fundamental differences?
In your case, the best option would be bosch model gaz wbn6000-18 and wstb 120.
Error codes for Bosch WBN 6000 boilers
Error A7- Malfunction of the DHW temperature sensor. Inspect the sensor for defects or short circuits and its wiring. Replace if necessary.
Ad Error- The unit cannot detect the boiler temperature sensor. It is necessary to inspect the boiler temperature sensor and connecting wires.
Error C1- The fan rotates at low speed. You need to check the mains voltage. Also inspect the flue gas exhaust system and, if necessary, clean or repair it.
Error C4- The differential pressure switch does not open if the fan is turned off. The differential needs to be inspected. pressure switch.
Error C6- The differential pressure switch does not close. Check the fan and wires with plugs. Replace if necessary. Inspect the differential. pressure switch and exhaust pipes for combustion products.
Error C7- The fan does not work. Check the fan and its wires with plugs. Replace if necessary.
CE error- There is not enough pressure in the heating system. Needs to be filled with water.
Error d7- Gas system malfunction. Check the connecting wire. Inspect the gas system and replace if necessary.
Error E2- Faulty temperature sensor on the supply line (break). It is necessary to check for possible damage or short circuit of the sensor and its wiring. Replace if necessary.
Error E9- The temperature limiter in the heat exchanger is triggered. It is necessary to check for possible damage to the heat exchanger temperature limiter and its connecting wires. Replace if necessary. Check the nominal pressure in the system. Inspect the temperature limiter and replace it with a new one if necessary. Check the start of the circulation pump and, if
it is necessary to replace it. Check fuses, replace if necessary. Remove air from the unit. Check the water circuit in the heat exchanger. Replace if necessary. Check the flue gas temperature limiter for possible damage.
EA error- There is no flame. Check the connection of the protection wires. Check to see if the gas valve is open. Check the gas supply pressure readings and correct if necessary. Check the connection to the electrical network, electrodes with wires and, if necessary, replace. Inspect the combustion product exhaust system, clean or repair it. Check the gas adjustment and correct if necessary. For natural gas: Inspect the relay that controls gas flow. Change if necessary. When working with combustion air intake from the room, check the air flow into the room and the ventilation openings. Clean the heat exchanger. Check the gas system, replace if necessary.
Error F7- When switched off, the boiler detects a flame. Check for oxidation of the electrodes and replace if necessary. Inspect the combustion products exhaust system and, if necessary, clean or repair. Check the electronic control board for moisture, dry if necessary.
FA error- Flame detected when gas supply is turned off. Check the gas system, replace if necessary. Inspect the electrodes and connecting wires, replace if necessary. Inspect the combustion product exhaust system, clean or repair it.
Error P- The boiler type is not determined. Set the unit type.
Fd error
Bosch boiler error codes ZWC MFA
Code A2, C3- Exit of flue gases at the combustion chamber. Check the heat exchanger for blockages.
Code A3- The flue gas temperature sensor is not defined. It is necessary to check the sensor and connecting cables for damage.
Code A4- Flue gas outlet at the flow fuse. Check the flue gas outlet.
Code A6- The temperature sensor in the combustion chamber is not detected. It is necessary to check the sensor and connecting cables for damage.
Code A7- Malfunction of the hot water supply (DHW) temperature sensor. Carry out a check to look for defects or short circuits in the temperature sensor and its wiring, if necessary, replace it.
Code A8- Contact with the BUS bus has been interrupted. Check the contact cable and regulators.
Code A9- Incorrect installation of the DHW sensor. Check the mounting distances, remove the sensor if necessary and reinstall it using heat-conducting paste.
Code AC- The module is not defined. The module is not connected correctly. Check the module, outside temperature sensor, remote control and contacts.
Code Ad- The unit cannot detect the boiler temperature sensor. It is necessary to inspect the boiler temperature sensor and wire contacts.
Code b1- Coding plug not defined. Correctly install the coding plug, measure it and replace it if necessary.
Codes C1, C6- The differential pressure switch does not close. Check the fan and wires with plugs. Replace if necessary. Inspect the differential. pressure switch and exhaust pipes for combustion products.
Code C4- Diff. The pressure switch does not open in the off position. Check the differential pressure switch.
Code CC- The control unit cannot detect the outside temperature sensor. It is necessary to inspect the sensor and contact cable for breaks.
Code d3- Jumper 161 was not detected on ST8. If there is a jumper, insert the plug correctly and check the external limiter. Otherwise: check if there is a jumper.
Code d4- There is a large temperature difference. Check the circulation pump, bypass hose and system pressure.
Code d5- The external temperature sensor is damaged. Check the sensor and connecting contacts.
Code E2- Flow temperature sensor is faulty. Check the sensor and connecting contacts.
Code E9- A limiter has tripped in the supply line. Check the pressure in the system and temperature sensors. Check the functions of the pumps and the fuse on the control board, and remove air from the unit.
Code EA- No flame detected. Inspect the gas valve. Check the pressure in the gas network, the network connection, the ignition electrode with the wire and the ionization electrode with the cable.
Code F0- Internal problem. Check the correct connection of the electrical plug contacts and start lines, and if necessary, replace the electronic board.
Code F7- The flame is detected when the unit is turned off. Check electrodes and cables. The flue gas removal system may be faulty. Check the control board for moisture.
FA code- Flame detection after gas supply is turned off. Inspect the ionization electrode. Check the gas system.
Code Fd- Incorrect button press (duration more than 30 seconds). Press the button again in less than 30 seconds.
Malfunctions and adjustments of Bosch boilers
The Bosch company assures that its heat exchangers are not coated with a special protective anti-corrosion paint. Heat exchangers from other companies (Viessmann, Vaillant, Ariston, Baxi) have a protective layer applied, but theirs is pure copper. And they present this as an advantage of their models. Is this true or is it just a reduction in the cost of the device.
Copper really does not corrode, which is why it is used. But due to its properties, copper burns quite quickly.
As I know, there are two options for connecting the BKN to a double-circuit gas boiler. First, through three-way valve. The second, through the hydraulic separator. In both cases, it is used as a consumer for the heating system; accordingly, it will be heated by the temperature of the heating system. This is clear to me. But I don’t understand what I should do with the DHW taps, and whether it’s possible to just put plugs on them. At first I
I assumed that I would buy a Bosch 6000 single-circuit boiler, but since it was not available, I was recommended to opt for a double-circuit one. And I’m wondering, if I plug the outlets, won’t the heat exchanger be damaged (won’t it burn out without water)? Since I will not keep the unit constantly operating at maximum, let the BKN continue to work. Moreover, I bought an ACV Comfort 130, and by design it is a tank in a tank and, in fact, should hold the temperature better than with a coil. Among the disadvantages of such boilers is the maximum pressure of 3 bar, and safety valve on the same pressure. A knowledgeable people they report that if the valve does not work for some reason, the tank will burst. About the dual-circuit model - I’m afraid that if the boiler fails, I’ll be completely without hot water I'll stay.
Your conclusions are only valid for purified water. For domestic needs, you can set up a backup line. But in my memory, there have never been any cases of failure of ACV boilers.
In a private house, I organize separate smoke removal for a 24 kW Bosch 6000 gas boiler. In this regard, I have two questions. Exhaust tract. Is it worth switching from “pants” 80-80 through a tee with a condensate drain to a vertical chimney diameter of 100 mm? The cost of pipes of different diameters does not differ much from each other. The height of the chimney to the tee is 4800 mm. I bring the pipe through the roof,
considering 10 degrees. Intake tract. I am going to organize the air intake in an unheated and well-ventilated attic. Before outer wall about 4 meters. Do not take air from the room good decision. The distance from the sampling point in the attic to the upper plane of the unit is about 1050 mm (with 800 mm of the entire length inside the boiler room). In winter, such a solution can create a number of problems,
the main thing is that the device will be supplied with air from outside temperature. It is also possible for strong condensation to form on the air duct, which will fall onto the housing. But if condensation can be combated with thermal insulation, then how to solve the problem of warm air I do not understand. As an option I considered feeding the air duct from chimney baths (you will need to brew
water register with a diameter of 300-500mm). Organize circulation in the register with a separate circuit. This is very difficult, but it should give results. Can you tell me which chimney kit is suitable for installation on the wbn 6000-24 c? You need to take the chimney out just beyond the 375 mm thick wall; you won’t need to extend it anywhere further. Since the prices for branded equipment are very high, I would like to try another manufacturer.
Neva, for example. Will it be possible to reprogram a single-circuit unit if you first turn off the DHW flow sensor?
No. It will be necessary to replace the control board of the single-circuit boiler and the hydraulic unit from it. And also install a three-way valve additionally.
We recently washed the heat exchangers of a Bosch 6000 gas boiler. It worked for a month and kept the pressure at 1 all the time. Then I noticed a strange gurgling sound inside it before the burner ignited (in cooling mode), as if water was being poured from one mug to another. I looked, and the pressure was 0. In theory, it should have automatically turned off when the pressure in the system dropped to 0.5, but it worked and warmed up the batteries.
The only thing was that there was a different sound and murmur. I increased the pressure to 1, but the next day the pressure dropped back to 0.5 (meaning there is a water leak somewhere). I checked the pipes and radiators, but couldn't find any leaks anywhere. The unit also does not drip, but the pressure still drops. Tell me what it could be
problem and where to look for it?
I had a similar experience. There was air in the system and after operation of the device the air came out and the pressure dropped. Is your automatic air vent valve (on top of the pump) not closed? It needs to be always open. It is better to bring the pressure to 2 atm so that the expansion tank in the boiler also takes in the volume and compensates for the escaping air. In radiators, of course, you should also bleed air using a Mayevsky valve.
The Bosch 6000 24 kW gas wall-mounted boiler often gives an EA error and often turns on and off. That is, conditionally - set it to at least 40 degrees, literally 5 minutes and turned off, etc. Previously, it heated as it should, but now the first batteries are hot, the distant ones are barely warm, it doesn’t reach them. It operates based on the return temperature; there is no room thermostat.
Error EA can be eliminated by setting the fan stage to value 5. The fact that the unit turns off quickly means that its minimum power is too high for your system. It cannot produce less than 8 kW. And you apparently have 5 radiators in the system. So he heats this water and turns off. And why does it heat them up so quickly? The following malfunctions are possible: something is clogged or airy, or the first radiators need to be balanced so that the entire flow does not go only through them. Here you need to look at the radiator diagram and so on. Try setting the pump speed to maximum (value 3) and bleeding air into the radiators.
Tell me, who knows about: Wall-mounted gas boiler WBN 6000-18C RN. What tests are carried out in production? Do they launch them?
Everything was fine for me, I don’t think it was like this from the factory, most likely the storage was strange.
Tell me: the Bosch wall-mounted boiler stopped, the pressure rose to 3 bar, and it showed error E9r. Tried to restart it worked, after 10 seconds. The pressure jumped to the maximum, I stopped everything, turned it off, and released the pressure. I checked the gas pressure and it was normal. What could it be?
If the system is new, then the expansion tank is small, if it is old, then the expansion tank is faulty, or maybe the make-up is leaking. In your case the problem is expansion tank the most likely. If this is the case, then option 2: pump up the pressure, replace the tank.
After opening the hot water tap and igniting the burner, the Bosch boiler displays error E2 (flow temperature sensor is faulty). This happens in 10-15 seconds. After closing the tap, the error clears itself and the boiler continues to operate in heating mode. If the tap is opened again, the situation repeats. To complete the picture: An additional circulation pump, before installing it
The boiler showed error E2 in heating mode for a couple of seconds, and then changed to E9 (the heat exchanger temperature limiter tripped). Source of water supply borehole pump(water supply pressure from 2x to 3x without sudden jumps).
Possible reasons such: the own circulation pump is faulty (if it is only used in DHW mode), the strainer is clogged. The sensor probably shouldn't be ruled out.
Boiler zwa 24. The concept has changed, a heat exchanger from zsa, a boiler sensor and a three-way valve are needed. The pay, I think, is the same for them. In general, from a double-circuit one it is necessary to make a single-circuit one.
The manufacturer does not recommend such modifications. But if you want, you need to purchase a heat exchanger. Their feed tubes are the same, but their outlet tubes are different. The 2-circuit one has a hole for refilling, but the 1-circuit one does not. There are 2 options. Change the handset. Figure out how to plug the hole. The control boards are the same.
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