Error codes for gas boiler Hermann (Herman) - malfunctions and troubleshooting methods

Hermann gas equipment is designed for heating large areas. Double-circuit units additionally supply housing with hot water. The equipment is equipped with convenient controls with a display. If a malfunction occurs in the system, a code is displayed on the screen that indicates the cause of the failure. We list all error codes for the Herman gas boiler in the table.

Basic error codes

When boilers operate, malfunctions are inevitable. Let's look at the main error codes for a Hermann gas boiler:

Error e01 - no flame - can be eliminated yourself. Perhaps the burner flame suddenly went out or did not ignite in time. It is necessary to press the “reset” button, giving the boiler the command to ignite.
If this fails, you need to check whether the gas supply is open and whether it is in the cylinder. Incorrect power supply - if error 01 appears on the display - “reset” - you must press this button.
If the problem remains, you need to check the correct connection of the phase, grounding and neutral. If they are mixed up, then the device may not see the flame, even after it has flared up. The neutral may be out of balance.
Read also: What cable is needed to connect a house to a 15 kW electrical network
Error e02 - the safety thermostat has tripped - can be eliminated on its own. Overheating has occurred. The display will usually show “reboot”. Turn off the unit and after cooling completely, press “reset”. If it doesn’t help, call a specialist.
Error e03 - the fuse responsible for removing smoke has tripped - can be eliminated. Smoke was removed incorrectly. Perhaps even a gust of wind. Click “reset”. If error 03 does not disappear, check the chimney.
e05 - heating temperature sensor is faulty - call a technician.

Temperature sensor (thermistor) for Hermann boilers

e06 - DHW temperature sensor has failed - call a technician. Usually the display shows “service”.
e09 - the time has come for maintenance - to invite a specialist. This does not prevent the boiler from working - you can press “reset” and the problem will disappear for a few days. However, after three such presses, error 06 will remain on the display permanently.
e10 - the sensor on the bottom of the boiler indicates insufficient pressure - if error 10 occurs, you need to check the air release valves on the radiators - often the pressure in the system drops through them.
e11 - the error is inherent in the “SE” model - blocking by the device responsible for removing smoke - call a specialist. Disconnect from the network, turn off the machine and apply voltage to the boiler again - if it does not work, you will have to contact the service center.
e18 – water is being loaded into the heating system – it is eliminated automatically. Due to the pressure drop in the system, the boiler is loaded with water from the water supply. Wait until it finishes and the error should disappear.

Hermann boiler feed tap
If the pressure is not restored three times within 24 hours, the boiler will go into lockout and error code e19 or e21 will be displayed. Then you should call a technician.
e19 – replenishment was not completed within the specified time frame – call a technician.
E21 - the pressure in the heating system is below the permissible level - is eliminated by a specialist. Sometimes this happens due to air residues in the system. A coolant leak is also possible.
e22 – not consistent saved data – call a technician. The display usually shows “service”.
E24 - the safety thermostat has given an error signal - you can fix it yourself if it is installed on the floor and there is an existing safety thermostat. The temperature under the appliance may be too high.
The thermostat specifically monitors its level in order to protect owners from possible damage to the floor covering. In this case, the boiler will block the heating, but will continue to heat the water.

Safety valve Wait until the floor cools down, restore the thermostat and press “reset” - there may be a delay of 30 seconds. If this does not help, you should call a technician.
E33 – incorrect electrical installation configuration – error 33 is corrected by a technician.
E35 - inappropriate flame - can be eliminated yourself. A special device blocks the boiler. IF A FLAME IS DETECTED WHEN IT SHOULD NOT BE. You need to press the “reset” button. If the device stops again, call a specialist.
e36 - the general fuse has tripped - is eliminated by the User. If pressing the “Overload” button does not help, call a technician.
E38 - external temperature sensor is faulty - call a technician.
E39 – possible freezing of the heat exchanger – call a specialist. Occurs when water or heating sensors detect temperatures equal to or less than 0 degrees. The boiler begins to circulate water in the system and if within 15 minutes the temperature does not increase by 1 degree, the error will remain.
Error e42 is an error related to the microprocessor. The return line may overheat - call a specialist.

Other faults

Hermann gas boilers, like most heating devices, consist of many electronic components that are responsible for the basic parameters of their operation. But there is one failure that is common to almost all models.

Progammator for Hermann boilers

When switching to the “Summer” mode, the boiler does not want to switch to hot water. When it is in winter mode, it does not respond to the opening of the hot water tap. As a result, the circulation pump in the heating system does not turn off.

In winter mode, if you open the hot water tap, the heating circuit does not turn off and hot water is drawn from the heat exchanger. It is typical that with such a malfunction, the indicators do not show errors. The reason for this behavior of the device is the flow sensor.

A reed switch sensor is installed on the cold water inlet pipe, which is controlled by a float valve with a magnet. There is simply nothing to break in it. Therefore, if it is necessary to transfer the boiler from one mode to another, you should be extremely careful and take your time.

Malfunctions, repair and maintenance of Herman gas boilers

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The Hermann Habitat 2 boiler does not want to start. As long as you hold the start button, the burner operates. But if you do not fix the button, the device fades out. Explain the reason for the breakdown? The thermoelectric converter is probably faulty or there is a problem with the gas valve. There is also a decrease in gas pressure on the inlet line. In some cases, there is a lack of voltage on the control board. Recently a problem occurred. Ignition is difficult. The ignition device lights up, but the main burner does not have a flame. Can't figure out what the reason is? Most likely, damage to parts of the ignition device. We advise you to check the device and clean the ignition unit. Why does the Herman Micra double-circuit gas wall-mounted boiler stop turning off the moment the heating reaches the required temperature? Heating goes up to 90 degrees, then a problem occurs. After a restart the situation starts again. We assume that the control board is malfunctioning, the boiler water temperature sensor is faulty, or the safety sensor button is broken. It is quite possible that there is a malfunction in the automation. I would like to know why it is not possible to raise the temperature of the coolant to more than 70 C? We need to set more, but the display shows that this is the largest value. How should the heat be increased? When the unit does not complete the cycle of raising the temperature of the heating system, the following reasons can be assumed. The adjustments limit the maximum heating temperature to no higher than 70C. There was a decrease in the chimney draft speed. The Hermann Supermicra double-circuit boiler began to operate unstably during the heating stage of the hot water supply circuit. Hot and cold water flows alternately from the kitchen faucet. Help please, why is this happening? The factors that cause the problem appear to be the following. There was an admixture of cold water due to the fact that the 3-way valve was inoperative. The heat exchanger is clogged with debris. It needs to be cleaned. Water often leaks from the tap at the bottom of the boiler. The unit itself does not start. What do we have to do? Apparently, the coolant is escaping from the safety valve. This circumstance indicates high pressure in the system. In addition, the system filling valve may not be closed, or the expansion tank may need to be pumped. Please tell me what is the reason why the pressure constantly rises, and at the same time the relief valve is triggered? The heating icon appears on the screen every time the device is in heating mode. What should I do? There is a problem with the heating circuit temperature sensor. Stopping the corresponding circulation process in the heating line. What is the problem if the Habitat 2 boiler often turns off? In particular, recently the piezo ignition failed to work at all. The boiler was serviced that week. What could it be? It appears that there has been a functional problem in the chimney system. You need to have your chimney inspected. Incorrect operation of the electric ignition indicates damage to its parts due to a voltage drop or water leakage. Can anyone help me figure out my chimney? Soon the second day, a return draft occurs, and the smoke enters directly into the room. I made the chimney myself. It consists of a metal pipe. There must have been some mistake. The unit heats domestic water normally, but the moment the heating is turned on, the water immediately comes to a boil, and the unit fails. What kind of breakdown is this, and how can I get rid of it? Presumably, the circulation pump is not working, the electronic board is faulty, or the temperature sensor is faulty. At the same time, the filter mesh may become dirty. In the hot water preparation mode, the boiler begins to produce cold and hot water in turn. I don't understand what the problem is. How to set water heating? Most likely, the heating system is dirty or the heat exchanger needs to be cleaned. In addition, the relay that controls the pressure may be broken, or the circulation pump may be broken. The main reason may be an incorrectly manufactured chimney pipe structure. Sometimes there is soot contamination, which significantly reduces its efficiency. In addition, it is necessary to inspect the ventilation openings in the house. We use a wall-mounted gas boiler Hermann Micra. The unit suddenly rises to a temperature above 96 degrees, and then locks with an error. Subsequently, when it cools down, it starts automatically. What is this connected with? An overheating alarm indicates a lack of circulation process. First of all, you need to check the radiator taps. They must be left open. Then the filter is inspected for clogging, and you also need to make sure that the heat exchange device is not clogged. I launched this model in February of this year. After about a few weeks, the device sometimes began to make a lot of noise. Please tell me why it makes noise? Presumably, the heat exchanger is clogged with scale. If the water is hard, then limescale deposits are deposited in the wall of the radiator tubes. We are planning to connect a Thesi boiler to heat the house. Please tell me how it is recommended to put such a unit into operation? To ensure that this equipment is put into operation correctly, the following steps must be taken. Connect electrical power to the unit. Open the gas valve. Then turn on the main burner. Next, set the desired temperature. We want to do some maintenance. Instruct me on how to properly drain the water from the device? In accordance with the passport, this procedure is carried out as follows. Disconnect the unit from the network. Turn off the gas valve. Open the automatic air vent. Turn the tap to drain. Then remove the spilled water. Otherwise, water can be drained through the relief valve. This valve is located at the bottom of the unit. Explain to me how to diagnose the operation of a three-way valve? I think this component is not opening correctly. During the heating cycle, the last batteries cannot be pumped, however, in DHW mode, the pipe is heated to allow coolant to flow under the boiler. Of course, it is necessary to check the 3-way valve for acidification of the rod in the intermediate position. We also recommend having your heating system diagnosed. We use a Herman Micra 2 double-circuit boiler indoors. Until yesterday evening it worked without any questions. Now, 3 seconds after start, the device began to go out. It seems that it cannot force the coolant into the system. Tell me, what kind of problem is this? The probable cause of this damage may be the ignition electrode, which does not register the fire, or a decrease in the circulation process. The other day a problem arose with this model. In heating mode it whistles. I decided to restart it - I succeeded, but it still whistles. Maybe someone can tell me why this is happening? Very often, a loud whistle occurs when the pressure on the burner nozzles is not adjusted according to the instructions. It is necessary to check the gas pressure adjustments and correct if necessary. The other day water leaked into the gas boiler and it began to function with problems. Let’s say if you set an arbitrary temperature, and heating occurs exclusively up to 26 degrees Celsius, after which it turns off. Please tell me what could have gone wrong? If the electronic board unit has been flooded with water, it is probably damaged. It is necessary to reset it by linearly disconnecting the unit from the power supply. Then turn it on again and check its functionality. The Habitat 23 SE boiler is in operation. Now, at the moment of start-up, the wick lights up for 9 seconds, but the main burner does not catch the fire, and because of this, the device begins to fade. What is the best way to solve this problem? The ignition unit is probably defective or there are problems with the burner. In any case, check whether the phasing has gone wrong when connecting to the power supply. I connected the same device in the middle of this year. About 3 months later, a malfunction occurred in the DHW circuit, although the heating circuit was functioning smoothly. I tried to open the hot water tap, but it just displays the temperature and doesn’t even think about heating. What is the cause of the problem? The 3-way valve may be faulty. It must be replaced. Could you tell me for what purposes the boiler is equipped with a safety temperature sensor? The temperature sensor does not allow gas to enter the burner in case of overheating of the liquid in the DHW system. I need to wash and clean the main water heat exchanger on my Micra 2. Can you please explain how to properly remove it? The main heat exchanger can be freely removed from the device using a regular screwdriver. Below is a description of the removal procedure. Drain the water from the appliance using the drain tap. Then we empty the hot water supply system of water. Unscrew the mounting bolts of the main heat exchanger and remove it from the frame. The Herman Habitat wall-mounted boiler was launched. After about 4 months, the water pressure in the device decreased. Often he throws it off and stops. In other words, it doesn't hold pressure at all. Why doesn't he hold the pressure? If the unit does not gain water pressure, the make-up valve is likely leaking. If a shutdown occurs and the pressure drops to zero, the 3-way valve breaks. Explain how to clean the cold water filter? First, drain the hot water circuit. Second, unscrew the flow sensor nut. Then we remove the sensor and filter from the cavity. After this, we remove the accumulated debris and dirt. The unit made a humming sound when starting up, but now the noise has become louder. At first the sound disappeared quickly, but now it lasts longer. Has anyone observed such a problem? The formation of excessive noise indicates the presence of limescale deposits inside the body of the heat exchange device, which heats unevenly due to different wall thicknesses. The more clogged the heat exchanger is, the more pronounced the rumble, and the heat transfer decreases accordingly. The device seems to be working, although water apparently does not circulate in the system. The return pump got very hot. What could have happened? Apparently, the dirt filter is clogged or the tap has been turned off somewhere, which is preventing the coolant from passing through. The circulation pump could also be broken. Why is hot water not produced? The water coming out of the tap is barely warm. Can you explain what happened? The search for damage is carried out in several directions. Alternatively, the DHW temperature sensor is faulty; the sensor must be replaced. There is also a high probability that the water heating power adjustments have gone wrong. I constantly observe that the flame stops when ignited. The burner is clean, everything is fine with the chimney, the draft is excellent. Where to look for the problem? The device does not detect a flame due to a poor impulse from the ignition control unit. It is necessary to inspect the wiring from the ionization sensor to the electrode. It probably needs to be tightened. The sensor insulation may be defective and must be replaced.

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BAXI ECO FOUR

Heating system control. Installation. Connection. Transfer to another type of gas. Adjustment devices and protection devices.

BAXI LUNA

Peculiarities. Installation and assembly. Automation components.

BAXI MAIN FOUR

Technical specifications. Installation. Adjustment and checking. Maintenance.

BAXI SLIM

Adjustment and protection. Installation and assembly. Pressure setting. Maintenance.

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BAKSI - REPAIR

After starting, a malfunction appeared. It doesn’t want to turn on, it worked for two years, now the whole display lights up, just like when the boiler is turned on, when the self-diagnosis mode is in progress, then it clicks, turns off for miles and seconds and turns on the whole display again. It turned on once, but it gives error E10 water pressure, although the pressure in the system is 1.5 atm. Tell me, what could it be?

BAXI - OPERATION

In operation, the Baxi main four 240 boiler shuts down with error E35 (stray flame). Tell me what to do? First season in operation.

BAXI - SETTINGS

We installed and connected the Baxi Fourtech 24 F boiler. What cold water pressure is allowed at the inlet to the DHW device?

BOSCH - REPAIR

Bosch 6000 24 kW boiler, single-circuit with built-in three-way valve. The boiler sensor does not see it and gives an error. Tell me how to do it so that it doesn’t give an error and works normally for both the heating and the boiler?

BOSCH - ADJUSTMENTS

If you turn off the DHW flow sensor, maybe it will be possible to reprogram it into a single-circuit device through menu L3?

ARDERIA - REPAIR

We installed an Arderia esr 2.13 ffcd boiler. If my coolant pressure drops slightly by a couple of notches over 2-3 days, could the reason be a faulty three-way valve (there are no leaks from the radiators)?

ARDERIA - ADJUSTMENTS

The gas boiler Arderia 2.35 is in operation. Tell me about reducing power. I heard something about modulation, fan speed, etc. Is it really possible to reduce power?

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BUDERUS FLOOR

We installed and connected the Buderus Logano G234-WS-44 kW boiler, automatic Logomatic 4211. Heating is based on cylinders without hot water, and the jets for reduced gas were also replaced. We survived the winter, the cylinders were replaced, all without problems. Then in the spring, when the outside temperature was +16+18, the boiler began to turn off for a long time and when turned on, it began to display a burner error on the screen and the red button light on the front wall came on. We pressed the button, turned the power back on and everything worked. This happened several times, then the boiler was turned off completely for the summer, what could be the problem?

BUDERUS WALL

In the single-circuit Buderus 072, is the BKN coil circuit heated by the same heat exchanger as for heating or the same as on the 2-circuit one that is used for DHW?

VAILLANT - REPAIR

Tell me, for Vaillant wall-mounted gas boilers, are there real/actual differences for the better in the new generation turboTEC plus VU/5-5 compared to /3-5?

VAILLANT - ADJUSTMENTS

There is a malfunction in the boiler, the green LED (power) is flashing, the instructions say that the thermal protection has tripped, the green indicator is flashing, even if nothing is connected to the board. How to fix? I checked all SMD resistors and transistors, everything is fine.

DAEWOO

In operation there is a double-circuit gas boiler Daewoo Gasboiler with an electronic panel. When the DHW is turned on, the heating heats up, the operating mode is summer. I removed the three-way valve, there is no dirt or wear. It seems that the board does not control the three-way valve. How to check?

ELECTROLUX

The Electrolux Basic Xi wall-mounted boiler has been installed and connected. A problem began that the boiler stopped seeing the flame and turned off the gas supply after 7-8 seconds. And after 3 attempts it gave error E1. How can I fix it?

KOREA STAR

Koreastar boiler malfunction. The heating works perfectly, the hot water comes intermittently, when you turn on the hot water tap, cold water comes out first, then boiling water. After a few seconds it’s cool, then boiling water again. What could be the problem?

FERROLI

Malfunction of the Ferroli Domiproject 24 boiler - I set it to 60-70 degrees, it switches to minimum combustion, does not turn on, does not turn off. Restart is unstable. No pattern emerges. What to do?

JUNKERS

In operation, a Junkers euroline gas boiler, when hot water is turned on, gas ignites, then goes out, and so on several times. If you turn it on while the heating is running, the water heating starts immediately. Tell me, please, what could be the problem?

NAVIEN

Tell me about the adjustments of the gas boiler Navien Ace 16 turbo remote control v1.3. It is not possible to adjust the fan run-on. I set it to 30 seconds, but still 2 minutes. spins.

OASIS

Malfunction of the Oasis ZRT18 boiler. The unit starts, the gas lights up, then goes out. It lights up again and then goes out (this happens three times). Then it lights up and works fine. It doesn't give any error. What is the reason?

SAUNIER DUVAL

Malfunction of the Senor Duval gas boiler - the water pressure sensor shows 0.0, the indicator flashes red, the hot water does not heat up, but the water pressure in the apartment is good. How to fix the problem?

VIESSMANN

Where should a condensate trap be installed in a coaxial chimney? The boiler wh1d with a closed combustion chamber is located at a distance of 1 m from the wall.

WESTEN

Problem starting the Westen Pulsar D boiler. Piezo ignition works, but there is no flame, error E01 after a crackling sound. I moved the fork around.

BERETTA

The Novella floor-standing gas boiler is blocked - the green lights on the panel are on and nothing else happens. How to fix?

ARISTON

An Ariston gas wall-mounted boiler has been installed and connected, which does not hold pressure at all: while cooling the heated water, the pressure drops to zero, although water is regularly filled. What about the pressure?

SIME

Metropolis dgt 25 bf boiler malfunction. The hot water supply has stopped working, the heating is working, it does not display an error. What do you advise?

SOLLY

Please tell me how to solve the problem. The Solly Standard boiler, whenever you try to turn it on or hot water, displays a GS error.

WOLF

Wolf boiler in operation. Lately it has begun to behave strangely: during the pause between starts, it turns on the burner for one second five times, and 70 degrees appears on the display. Where to look for a problem?

ACV Wester Line works very unstable: it often crashes, makes a characteristic knock and stalls when starting, but at times everything is fine. The unit is almost new, what's wrong with it?

DEMRAD

In the gas boiler Demrad, the gas supply to the burner stopped. The piezo element clicks, but there is no ignition. There is nothing wrong with the gas stove, there is gas. What is the reason?

KITURAMI

The Kiturami world boiler is malfunctioning and stops periodically. I clean the flame sensor and the unit works fine for a while, but soon the same thing happens again. He also began to smoke heavily. Maybe the problem is that the chimney is short, and it needs to be lengthened?

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IMMERGAZ - ERRORS

Errors of Nike Star, Eolo Star/Mini, Mythos boilers. Malfunctions of boilers with the possibility of automatic unlocking.

IMMERGAZ - REPAIR

My boiler systematically raises the temperature to 80 degrees in winter mode. I called the repairman three times. He said that many models have this problem and suggested installing a programmer, but it’s not certain that it will help. Tell me how to solve this problem and will this programmer help?

AOGV

Models 11.6; 17.4; 23.2; 29.3 kW. Specifications. Control elements of the automation unit. Installation and maintenance. Malfunctions and their elimination.

AOGV - REPAIR

The AOGV gas boiler was installed and put into operation. Problem with hot water supply. The heat exchanger was washed. Less than a month has passed and the water is not flowing again. We put a filter on the water, but time passed, and again there was no hot water. What kind of breakdown could this be?

Installation and installation. Start-up and adjustment. Malfunctions and ways to eliminate them.

AKGV

Technical specifications. Installation and connections. Startup and operating procedure. Automatic adjustments.

NEVA LUX

The boiler Neva Lux 7023 is malfunctioning. It gives error E7 twice a month. But after reboot it still works. Now it gives error E6. It will work for 15 minutes and turn off. What could it be?

ROSS

Design and automation unit. Ignition order. Malfunctions and repairs.

ATEM ZHYTOMYR

Tell me, is it possible that due to low gas pressure the Atem Zhytomyr boiler goes out, a click occurs and goes out. What is the problem? Is it possible to temporarily disable automation and how?

LEMAX

We installed a Lemax KSG-12.5 Premium gas boiler. After turning off the main burner, a clicking sound occurs after a couple of minutes, what is the reason? Tell me?

KEBER

A KS-G gas boiler of 250 sq.m. was installed and connected. m. When ignited, it does not turn off, the temperature rises, if I am not mistaken, automatic Arbat 1. The flame is not regulated - it is too large. What to do?

LIGHTHOUSE

I installed the Mayak gas boiler and connected it. It works fine. But the reason is this. When it works on unit it squeaks a lot, if you turn the knob 2-7 the squeak disappears. Tell me, what could it be?

DANKO

We installed and connected a Danko gas boiler with automatic Kare, it works great on the igniter, but as soon as you add power to the burner, it goes out completely, yesterday it went out within 5 minutes, today it works for about 20 minutes and goes out completely. Has anyone encountered this problem?

GAZLUX

The gaseko 18 boiler is in operation. When hot water is turned on, the pressure in the system drops after replenishment, the pressure reaches 3 bar. Have to reset. What's wrong, how to fix it?

NOVA FLORIDA

Water often boils in the boiler, causing it to fail due to overheating. The heat exchanger was recently washed, the system is not clogged. What's the matter?

RINNAI

Rinnai 167 RMF boiler malfunction. Recently I started showing error 14. How can I fix the problem?

CELTIC

The Celtic DS boiler heats up to 45 degrees and sits all day, does not turn off and does not heat the batteries, sometimes it shows error A3. How can I fix this problem?

MORA

The hot water pressure in the Mora Top boiler has dropped. What is the reason?

MASTER GAS SEOUL

The Seoul gas wall-mounted boiler stopped turning on due to a no-ignition error. How can it be eliminated? What exactly went wrong?

Design and principle of operation of Hermann boilers

Hermann Habitat 2 (Herman Habitat 2) is a domestic double-circuit boiler designed for heating buildings up to 280 square meters. It is light in weight and small in size, which makes it indispensable for installation in small spaces such as a corridor or kitchen.

It is equipped with automatic control of water heating and ignition, and in addition, a system to prevent the formation of scale in the heat exchanger. Efficiency up to 16 liters per minute. There is special protection against overheating and maintaining traction. If voltage surges occur in the electrical network, the gas supply stops.

Hermann Habitat 2 boiler control panel

Hermann Micra 2 (Herman Micra 2) is a gas double-circuit boiler with a secondary plate heat exchanger. It is also large in size and equipped with automatic flame control and a system that prevents smoke from escaping outside.

The dashboard allows you to regulate the temperature using only two mechanical regulators. Designed for wall mounting and has built-in ionization electronic control of ignition and combustion. Ensures constant heating of water and coolant.

Hermann Thesi 23 E is a new series model with a capacity of up to 30 kW. Has the function of controlling the boiler from a distance. The system has two heat exchangers, which ensures instant hot water supply. Efficiency is about 17 liters per minute. Automatically recharges when pressure drops.