Herman gas boiler operating mode. Maintenance and repair of Hermann gas boilers. Frequent breakdowns that require boiler repairs

Answers from experts on boiler faults Herman

Question:

The minimum coolant pressure switch actually operates in the range of 1.1 (blocking) - 1.8 (allowing) bar. Is it possible to adjust the response limit? Boiler Hermann Micra 2 24E. At a temperature of more than 70 degrees. The pressure goes beyond 3.5 bar and triggers safety valve. Need some advice.

Service support response:

The minimum pressure switch is adjustable, there is a screw under the cap, but it is heavily painted over and the cap does not unscrew.

Your expansion (compensation) tank has lost air (nitrogen), you need to pump it up to 0.8 - 1 bar so that the water, which increases in volume when heated, has somewhere to go.

Question:

I have a Hermann micra 2 model. I drained the water from the system (added the battery).

I started pouring water into the system, but it didn’t flow, it felt like some kind of valve had tripped, and the blocking indicator was on on the panel.

Question:

Tell me, please, what to do? There are many reasons - there is no pressure in the water supply, the feed tap is broken, debris has gotten into the check valve behind the feed tap, or it is stuck. The pressure gauge does not work - it has failed, or debris has entered the capillary. It looks like the problems are in

check valve

. Tell me what can be done with it.

Question:

Service support response:

Remove the hydraulic unit and press the spring until it comes unstuck.

Question:

What to do if the water pressure in the heating system constantly drops.
Boiler Herman Micra 2. Look for a leak in the CO. First, check the pressure in the expansion tank. Boiler model Hermann micra 2. When I turn on the DHW, the burner either does not light up at all, or lights up and goes out after half a minute. Then it sometimes turns on again, but more often it doesn’t. Every day it gets worse and worse. The heat exchanger was removed and cleaned with a steep solution citric acid

, but it is not clogged - running water passes without effort. Pressure

Question:

cold water

check valve

The sensor is tested by measuring resistance at different temperatures.

Question:

Remove the wires from the sensor and connect to them a resistance of at least 4.7 kohms and it will be somewhere at 44 degrees DHW. Boiler Herman Habitat. When I turn it on hot water

The batteries get hot in any position of the switch (winter-summer), please tell me what the problem is and how to fix it.

Question:

The 3-way valve stem does not switch completely, and part of the coolant goes into the radiators. It is necessary to disassemble and clean, and also polish the 3-way rod and the diaphragm rod.

As soon as we open the hot water, the boiler starts. But the temperature is not regulated. The temperature reaches 75 degrees, then the boiler goes out as the temperature drops to about 45-55, the boiler burns again. What could this be connected with? Thank you in advance!

Service support response:

How did you measure the temperature? Maybe your thermometer has gone bad? The fact that the boiler turns off when the DHW is turned on - there can be a lot of reasons, for example, have you checked whether you have airing of the upper heat exchanger in the central heating circuit?

Boiler model Hermann micra 2. The problem is a pressure drop in the system.

I tried to add water, when the system heated up, the pressure rose to more than 3 atm, and the safety valve was activated. I started looking for the cause and noticed that there was no pressure in the expansion tank. I pumped the pump to 1.1 atm, everything worked. But, over time, the pressure dropped again, pumping was enough for several days. Now I pump up 2, 3 times a day. Tell me, what could be the reason?

Question:

Drain the water from the system to 0 bar, leave the drain valve open, pump air into the tank, from

drain tap

Water will start flowing - this is normal. After the water stops flowing, close the tap. Pump 1bar into the tank (at this time the boiler pressure gauge shows 0!).
Do I need to reprogram the microcircuit when connecting to liquefied gas, or just replace the injectors and nothing else is needed?
When connecting to liquefied gas you need:

Question:

Replace injectors.

- Set the switch on the board to the GPL position.

Question:

- Adjust the gas valve.

Service support response:

The DHW flow sensor does not work.

Question:

Winter has come, problems have begun: the pressure goes away, the boiler is blocked, everything is dry in the heating system, but when you turn on the hot water, you can hear a distinct smell of water from the heating system, the make-up valve is normal (I was hoping for it), according to the diagram, the problem can only be with the three-way valve ? where to look? are there repair kits?

The three-way system is designed so that if any of the circuits are not sealed, water flows out. If the make-up valve is normal, then look at the secondary heat exchanger.

Question:

I have a problem. The Herman Habitat boiler has been operating for 2 years. But this winter the boiler began to show a malfunction problem (01) and the red light came on. According to the instructions, I set the reset to 0 and then the heating turns on again. But after 0.5-1 hour it shows (01) again and the red light comes on. Help me solve the problem.

– the burner was not turned on or the flame went out – improper combustion. Check the gas valve setting, ionization electrode, and grounding of the boiler body.

Question:

Please tell me why the Hermann micra 2 boiler took me three evenings of attention to it - and without success! it turns off and on every second, sometimes every five, sometimes 10 or 20 seconds of flawless operation! The malfunction indicator does not show, everything just goes out and then again. starts work from scratch! pressure in compensator 1, on pressure gauge 1.5! One, two, three unclear work

check valve

and the boiler starts working normally for 5-8 hours, maybe even 1 hour!

Question:

This occurs in turbocharged boilers - the fault is with the presostat, water in the tube near the presostat, or a frozen coaxial pipe.

Boiler Herman. The switch is in the summer position. When opening the hot water tap, the burners do not light. The water does not heat up, it flows cold.

Question:

It is necessary to check the DHW flow sensor and the NTC sensor. Problem with hot water supply. T is not adjustable, it is minimal in any position. The heating may randomly turn off or not turn on. This is the picture both in summer and

winter modes

Question:

. Has anyone encountered a similar problem?

check valve

The sensor is set at the factory and cannot be adjusted (to prevent overheating of the heat exchanger due to low water pressure in the heating system) - it is easier to keep the pressure in the system around 1.5 bar to avoid blocking.

Question:

Tell me, in order to remove the three-way valve, you first need to remove the bracket to three-way valve and pull the valve towards you?

Remove the bracket, move the microswitch to the right, towards gas valve and when it goes beyond the rod plate, pull it towards you.

Question:

The pressure in the expansion tank dropped, restored it, added pressure to the CO, started the boiler, when the pressure reached above 3 bar, the safety valve activated, the pressure dropped to 1.5 bar (the boiler was turned off, but the safety valve continued to work). It looks like it's "stuck" - what's the best way to restore normal operation of the safety valve?

Disassembling and cleaning the valve seat and rubber.

Question:

There is a Hermann Micra 2-23E boiler, after flushing the secondary heat exchanger and replacing expansion tank I noticed this strange thing (the heating is turned on at 3, the temperature is 60 degrees, the pressure is about 2 bar) when turning off the heating the pressure drops to about 0.5 bar, so in order to start the boiler again you need to add water to the system, and when heating, bleed off excess water since the pressure begins to rise above 2 bar, and so on every time the heating is turned off. Tell possible malfunction. Thank you in advance for your help!

Service support response:

The expansion tank is empty. Or over-pumped.

Question:

Hermann micra with mechanical pressure gauge/thermometer. More and more often it does not start when disassembling the hot water supply. How to carry out at least an approximate diagnosis without disassembling (dismantling) the hot water supply unit?

Replace the membrane. This membrane determines the pressure difference between the chambers.

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OPERATION AND REPAIR OF BOILERS

The Hermann gas wall-mounted boiler is a serious product, stuffed with electronics that controls all the main parameters. But we encountered a breakdown that did not “fit” into the instruction manual.

Signs of a Hermann boiler malfunction

  • When switching modes to the “Summer” mode, the boiler does not switch to hot water. In the “Winter” mode, the boiler “does not see” the request for hot water (opening the tap) and does not trigger a shutdown circulation pump for heating.
  • In the “Winter” mode, when the DHW tap is opened, the heating circuit does not turn off and the system “takes” hot water from the heat exchanger of the heating system.

At the same time, the electronics “does not see” the malfunction. Indicator lights indicate operating status.

A set of malfunction symptoms indicates the place where the mode switching occurs - the flow sensor. At the cold water inlet pipe into the heat exchanger, a single element connected to electricity is installed - a reed switch sensor, the control element of which is a float valve with a magnet (setting element). There is nothing to break in this sensor.

It turned out that this is not at all the case. The reed switch of the sensor is triggered when a magnet approaches it, but, for unknown reasons (weak magnet, low sensitivity of the reed switch or something else), the reed switch stops responding to the approach of the valve magnet when there is a request for hot water.

You can buy a flow sensor separately, but the reason may be in the valve magnet and not everyone has a service center nearby.

The extensive life experience of our specialists gave rise to the idea of ​​using a reed switch from an alarm sensor IO 102-14. According to its characteristics (sensing distances: closed - 12 mm, open - 45 mm and operating voltage- 1…72 V) and overall dimensions it is not much different from the “native” one.

Disconnect the connector from the sensor, remove it from the valve (2 screws) and disassemble the sensor. All we need from him is the foundation.

We attach the sensor from IO 102-14 (with wires) to the base. The method of fastening does not matter (we glued it to eliminate the possibility of the valve “sticking” to the metal fastener), but it is advisable to align the center lines of the new reed switch with the position of the old one.

Because We don’t know whether the reed switch will work from the “native” magnet, so we carefully replace it with a magnet from the broadcaster. The weight of the magnet does not matter, because the valve rises under water pressure.

The Hermann company was founded in 1970 and has been specializing in the production of wall-mounted gas boilers for more than 35 years.

In 1986, a boiler with a built-in boiler was launched into mass production, in 1998 - the most compact boiler with a height of only 700 mm, and in 2000 - the first condensing boiler.

Patented in 2005 unique system hot water temperature control (WSS Water Stability System).

Hermann today is a specialized enterprise occupying 40,000 m2, more than half of which is production space. The production cycle is fully automated and is carried out on seven conveyor lines. The company employs more than 200 people. In Italy, Hermann has one of the widest networks service numbering more than 500 service centers. The company's products are exported to 21 countries around the world.

The company's growth over the past five years has been 150%. Today, the company's factories produce their products from Sanieur Duval, Renova, Romstal, AEG, Vaillant, Baltur. In 2005, Hermann produced 160,000 wall-mounted gas boilers.

The company has its own technical department, research laboratories, and pilot production. Every year more than 4,500,000 euros are invested in innovation, research and product development. All new Hermann products are designed in a modern design center with the involvement of specialists from design bureaus in France.

The RosTeploEnergia company provides repair services for modern boiler equipment. Italian Hermann boilers are in great demand in Russia due to their excellent operational characteristics and high energy efficiency. However, over time, even the most reliable equipment needs repairs.

The most common causes of breakdowns are related to operating conditions and do not depend on the quality of the equipment. These include:

  • unprofessional installation of the boiler;
  • incorrect setting of heating and water heating modes;
  • frequent power outages;
  • use of hard water, etc.

If a malfunction or malfunction is detected, it is important to contact specialists as soon as possible. The faster this is done, the cheaper the repair will be and the longer the equipment will last. Modern boiler equipment is complex automated systems, the maintenance of which should be trusted only to experienced personnel.

Contact RosTeploEnergia

The RosTeploEnergia company is one of the leaders in the field of sales of spare parts and repair of Hermann boilers. Our specialists have a great practical experience maintenance of boiler equipment of any type. Modern equipment and software allow for accurate diagnosis and repair of any complexity. You can learn more about the repair of Hermann heating equipment from the company’s employees

The cost of repairing Hermann heating boilers

Name of works

Note

Price, rub.)

Replacing the ignition and control unit

Replacing the boiler built into boilers

Fan replacement

Replacement and adjustment of the ignition and ionization electrode

Pump replacement

Replacing the expansion tank

 2 800
Replacing the boiler heat exchanger 3 500
Replacement of combined gas fittings 4 900
1 300
Cleaning soot in the boiler 3 000
EMC (complex) 1 750
Prevention of a wall-mounted boiler (not a condensing boiler) 4 000
Prevention of a floor-standing boiler From 30 to 60 kW 5 000
Prevention instantaneous water heater PC. 3 000
Cleaning and flushing the boiler burner 2 200
Cleaning the instantaneous water heater burner 1 200
Cleaning the igniter 1 150
Cleaning the thermocouple 1 500
Cleaning the thermogenerator

Cleaning the ignition and ionization electrodes

Cleaning the Flow Sensor

Cleaning the igniter nozzle

Cleaning the water filter

Pressure pumping in expansion tank

Commissioning works

Converting the boiler to natural / liquefied gas
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