Boiler buderus no hot water

What to do if the gas boiler is broken and does not turn on the hot water? Instructions for diagnosis and repair

Installation of double-circuit gas boiler can effectively solve the problem of hot water supply. But what to do if the hot water in the gas boiler does not turn on? Agree that you should not immediately panic and call the emergency service or service center.

We will get acquainted with the principle of a two-circuit boiler, we will tell about the reasons that can lead to the termination of the hot water supply and ways to fix the problems that have arisen.

Understanding the operation of the equipment, you will be able not only to identify the causes of failure on your own, but also to eliminate most of the malfunctions and restore the hot water supply in full.

Wall hung gas boilers Buderus

Buderus company since 2003 became part of the Bosch group. Wall hung boilers of this brand are represented by three model series Logamax U072, Logamax U052 and Logamax U044.

The company provides a wide model range of boilers with different technical equipment.

Series and model of the boiler is usually specified on a special label located on the boiler. For example, Logamax U072. 24K stands for:

U. gas heater with circulation pump

gas burner with premixing

combustion chamber type (2. closed, 4. open)

If there is a problem, this information will be useful to diagnose the nature of the fault that has occurred.

Best Indirect Water Heaters ��: Your Guide to the Best Options | HVAC Training 101

The seventh series of boilers Logamax U072 is the most extensive range of models in the power range from 12 to 35 kW. Boilers of this series are widely used for apartment heating and heating of small private houses.

  • Low noise level. the boilers are really very quiet
  • Variable speed fan
  • stylish design and easy operation

Boiler with modern technical equipment, compact size and affordable price.

Diagnosis in case of malfunction boiler Buderus Logano

Boiler Buderus Logano 44 kW unstably began to work in terms of heating the hot water system. Alternating hot and cold water coming out of the tap. Tell me why this happens?

At the bottom of the boiler there is a tap, where water is constantly dripping. The device itself doesn’t turn on. What do you need to do?

Coolant seems to be discharged through the safety valve. This fact denotes high pressure in the system. In addition, the filling valve of the system may be open or the expansion tank should be pumped.

Tell me why the pressure jumps up and the bleed valve kicks in? On the display blinks all the time heating icon in the boiler heating mode. What to do?

There is a problem with the temperature sensor in the heating circuit. There is no normal circulation in the heating line.

What is the problem if the floor standing boiler Buderus Logano G124 WS shuts down often? Let’s say today the piezo igniter didn’t work at all. The unit was cleaned at the beginning of the month. What is the problem?

We suspect that there is a malfunction in the smoke evacuation device. Chimney inspection required. Failure of the piezo igniter means breakage of its parts in the case of a power surge or water in it.

Someone can tell you how to fix the problem with the chimney? Soon to be the second day, there is a return draft, when the smoke goes straight into the room. The chimney was made by myself. It is a tube of steel. There seems to be a mistake somewhere.

Boiler functions normally in the DHW cycle, although when turning on the heating water boils, and the device gives a malfunction. What is the problem and how can it be fixed??

Circulation pump probably has a breakdown, control board failure, temperature sensor failure. The filter screen can also get dirty.

At the hot water stage, the unit alternately dispenses hot and cold water. Help me figure out what the correlation is. How to set the water heating?

There may be dirt in the heating system or the heat exchanger is clogged. There may also be a defect in the relay that controls pressure, or the circulation pump may have malfunctioned.

An important factor can be a wrongly made configuration of the chimney. Sometimes there can be soot deposits on the pipe walls, which sufficiently reduce its efficiency. Also be sure to inspect the hood in the house.

We use a gas boiler Buderus Logano 32 kW. The boiler suddenly reaches 96 C, but then stops due to overheating. Subsequently, when it cools down, it can turn on by itself. What is the problem?

If the overheating function malfunctions, there is a problem with the heating medium circulation. First of all, you should check the position of the taps on the radiators. They should be left open. Then it is necessary to check if the filter element is clean, and also it is necessary to ascertain if the heat exchanger is not clogged.

I hooked up this unit in the fall of that year. After about 2 months, the device suddenly began to make noise. Could you tell me what the reason for the noise?

Possibly the heat exchanger is blocked with limescale. If the water is hard, then further lime is deposited in the radiator pipes.

The Logano G334 WS boiler does not want to start. If you hold the on/off button pressed, the burner is functioning. If you press the button, the appliance fades. What is the reason for the malfunction?

Most likely, the thermocouple has failed or there are problems with the gas valve. There may also be low gas pressure in the inlet line. In some cases, there is insufficient voltage on the control board.

A malfunction has occurred. Difficulty in starting. Ignition device lights up, but no flame on main burner. It is not possible to find out what the reason is?

Components in the ignition mechanism may be defective. You need to check the boiler and clean the ignition mechanism.

For what reasons the gas floor boiler Buderus Logano G234 can not turn off after the set temperature? Heating continues up to 85C, then fails. Cycle repeats after restarting.

Presumably the control board is faulty, the temperature sensor is faulty, the safety sensor button is broken. It’s possible that the regulation of automatics malfunctioned.

Could you please advise why it is not possible to raise the temperature above 70C? We want to set more, but the screen shows that this is the maximum. How to increase the heating temperature?

When the unit does not raise the temperature of the heating circuit, the following problems are likely. In the settings there is a limit on the maximum temperature of heating up to 70 degrees. The chimney draught is tipping.

We are thinking to put a boiler Buderus Logano G234-44 WS in the heating system. Tell me how to put it to work correctly?

For the correct start-up of this apparatus it is necessary to carry out the following measures. Connect the power supply to the device. Open the gas valve. Then we start the gas burner equipment. Then set the desired temperature.

I need to make repairs. Instruct how to properly drain the unit?

According to the manual, this procedure is as follows. Disconnect the unit from the mains. Shut off the gas valve. Open a little bit the automatic air vent. Turn the drain valve. Then collect the leaking fluid. In the other case it is allowed to drain the water using the safety valve. This valve is located at the bottom of the unit.

Can you tell me how to check the function of the three-way valve? It seems to me that it doesn’t open all the way. On the heating regime weakly pumping the outermost radiators, but on the hot water supply is heated pipe for the coolant flow under the boiler.

It is indeed recommended to check the three-way valve for the presence of sticking of the stem in the intermediate state. In turn we advise to make an inspection of your heating system.

We have a gas floor standing boiler Buderus Logano G234-38 WS. Until that day, it was working fine. But now it switches off after three seconds after start.

How to eliminate the faults in gas boilers Buderus Logomax

Why has the Buderus Logamax U072-24K two-circuit wall mounted boiler constantly turned off? Yesterday the piezo ignition did not work. The unit was serviced two weeks ago. What happened?

There seems to be a problem with the chimney process. The chimney must be checked. Incorrect operation of the igniter can indicate a defect in its parts due to voltage fluctuations or water ingress.

Can anyone tell me how to fix the chimney problem? For two days there is a back draft that causes the smoke to go back into the room immediately. The chimney was made by myself. It is made of steel pipe. Probably inaccurate calculations.

The boiler heats utility water without a problem, but if you start heating, the water quickly boils over, and the unit stops working. What could be faulty and what is the best way to fix it?

Apparently, the circulation pump is inoperable, control board failure, the temperature sensor is broken. At the same time the filter screen could be clogged.

In the process of hot water supply, the unit alternately began to deliver hot and cold water. It is not clear what the problem is. How to regulate the heating of the heating medium?

It seems that there is pollution in the heating system or the heat exchanger is clogged. In addition, there could be damage to the pressure control sensor or the circulation pump is broken.

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The main factor is not the correct configuration of the chimney. The contamination of a pipe by products of combustion often occurs which limits its efficiency enough. It is also necessary to check the ventilation holes in the room.

Installed a week ago a gas boiler Buderus Logomax 24. Unit rises sharply up to 96 C, but then stops due to overheating. Later, when it cools down, it may turn on by itself. What is the problem?

An overheating fault indicates a disturbance in the circulation process. Initially you need to pay attention to the radiator valves. They are installed open. After that check for contamination of the filter element and make sure that the heat exchanger is not dirty.

Carried out the commissioning of this boiler in 2015. Apparently after three months the appliance started making a noise suddenly. What is the cause of the noise in the boiler??

The heat exchanger may be blocked with limescale. If the water is hard, then over time lime accumulates on the walls of the radiator pipe.

I decided to install a boiler Buderus Logamax U052 in a private home. Could you please advise how to correctly start up this device??

For the correct commissioning of this equipment, the following steps must be taken. Turning on the electrical power to the appliance. Open gas valve. Then we start the main burner. Then set the temperature to the desired value.

I need to do maintenance. Instruct how best to drain the appliance?

According to the instructions, this procedure is as follows. Disconnect the appliance from the power supply. Close the gas valve. Open the automatic air vent. Open drain cock. After that collect the leaked water. Otherwise, you can drain the water using a drain valve. This component is mounted on the bottom of the appliance.

Please advise how to diagnose the work of three-way valve? There is a suspicion that it is not fully open. In heating mode, it does not pump the outermost radiators, although the hot water cycle heats the heating supply pipe under the boiler unit.

This is correct, we recommend checking the 3-way valve regarding sticking of the valve stem in an intermediate position. We also recommend an inspection of the heating system itself.

We use a Buderus Logomax U072-18 boiler at home. Till this morning it was working fine. Now after 1 minute of starting the unit has started to go out.

I think it can’t get water into the system. Please help us, what is the factor of the problem? The probable factor of this failure can be the ignition electrode, which does not see the fire, or the lack of circulation.

Recently discovered a problem with the heater. It started whistling during the heating cycle. Decided to reset it. Got it working, but it’s still whistling. Can you tell me what’s wrong??

Often a sharp whistle occurs when the pressure setting on the burner nozzles is not carried out according to the instructions. Need to check gas pressure adjustments and correct if necessary.

Water has entered the gas boiler and it is malfunctioning. For example, we set a temperature, and the heating mode comes up only to 24 degrees, and then the unit turns off. I would like to know what has failed?

If water has poured into the electronic board assembly, it is probably not working correctly. We advise you to reset it by completely disconnecting the appliance from the electricity supply. Then restart the appliance and check its functionality.

Buderus U072-18K double boiler does not start. When you hold the on/off button, the burner is in the operating mode. But if you do not fix the button the unit starts to go out. What is the reason for this malfunction??

Apparently, the thermoelectric converter or gas valve is defective. Also there may be low gas pressure on the inlet pipe. In some cases the control board voltage is too low.

The problem is detected. Switching on is very difficult. Igniter ignites, but there is no flame on the main gas burner. I can’t figure out what it is?

Apparently, the ignition device has malfunctioned. We recommend that you check the device and clean the igniter.

Why does the gas wall hung boiler Buderus U072-12K stops switching off at the moment when the desired temperature is reached?? It heats up to 85 C, then fails. When restarting the cycle repeats.

Most likely the electronic board is out of order, the boiler water temperature sensor has a defect, the sensor protection button is broken. It is possible that the regulation of the automatic system has failed.

Can you tell us why the boiler doesn’t heat water over 70 C?? We want to set more, but the display shows that this is the maximum value. How to increase the heating temperature?

When the device can not realize the temperature rise of the heating system, the following reasons are possible. In the settings of parameters is the limit on the maximum temperature of heating to 70 C. The draft in the chimney is reduced.

Possible problems

Today there are many gas wall hung boilers from different manufacturers on the market. The principle of operation of units in all models is essentially the same, but each brand has its own nuances, which may have to do with the causes of failure and, as a consequence, poor water heating.

  • “Ariston” is an Italian brand that is characterized by reliability. Boilers of the brand are adapted to domestic utilities and operating conditions. The most frequent reason of malfunctions is a hard water, which contributes to clogging of heat exchanger and circulation pump.
  • “Navien. Korean autonomous gas boilers. They are easy to use and efficient. Feature of the modification is the presence of two heat exchangers and the lack of control panel on the body. The reason why the boiler “Navien” bad heats hot water, can be a stop of the equipment. The reason for this is an air pressure sensor, which in the presence of reverse thrust in the chimney assembly sends a signal to the control board, which closes the gas valve to the burner.
  • “Vaillant”. German quality is fully reflected in units under this brand name. Since the device is of European origin, most often suffer from its heat exchangers, which get clogged due to the improper quality of the conductive heat-liquid.
  • “Baksi” is another representative of Italian manufacturers of autonomous heating equipment. It has simple and reliable boilers. The main reason why “Baksi” does not heat water, as noted by experts on maintenance of such units, is a factory defect, which is sometimes found in the model line of this company.
  • “Arderia”. South Korean manufacturer. It has a certain algorithm of heating equipment control. Incorrect settings may be the answer to the question of why the boiler stops heating water.
  • “Protherm”. a subsidiary of the German company “Weilent. When operating these boilers, you need to monitor the quality of the heat transfer fluid, use cleaning filters to prevent the heat exchanger from clogging.
  • Buderus“. another “German” in the domestic market of autonomous heating equipment, which has proven itself on the positive side. As with all Europeans, malfunctions can be caused by the formation of lime scale inside the heat exchange system, as well as clogging of the working fluid flow sensor.

Troubles and breakdowns in the boiler Buderus Logamax

Wall mounted single boiler Buderus Logomax U072-35 does not start. When you hold the power button, the burner works normally. As soon as you release the button, the unit immediately goes out. What is the cause of failure?

It seems that the thermocouple or gas valve is broken. There can also be a drop in gas pressure in the supply line. Sometimes the voltage on the electronic board is too low.

There is a problem. It is difficult to start. Ignition pilot burner lights up, but there is no flame on the main burner. Help to understand what is the reason?

Probably a functional failure of the ignition mechanism. You will need to service the boiler and clean the ignition mechanism.

For what reasons the gas boiler Buderus Logamax U052 does not turn off after the heating has reached the desired temperature? Heats up to 90C, then crashes. After restarting the situation starts again.

Apparently the control board fails, the temperature sensor is damaged, the sensor protection button is broken. It cannot be ruled out that the automatic system has malfunctioned.

Could you explain why the temperature of the water can not be raised above 70 C?? We need to increase the temperature, but the display shows that this is the highest value. How to increase heating?

In the event that the device can not realize the increase in temperature in the heating system, the following factors can be assumed. In the settings set the limit on the highest temperature of heating no more than 70 degrees. The chimney draught is dropping.

Wall hung gas boiler Buderus Logomax 24 starts working unsteadily in the DHW heating cycle. The water in the kitchen tap could be alternating between hot and cold. Tell me why this happens?

Water often leaks from the tap on the bottom of the boiler. Appliance itself can not be started. What to do?

The heating fluid is most likely escaping from the safety valve. This situation means that the pressure in the system has increased. Also, the system make-up valve may not be closed or the expansion tank must be inflated.

Could you please tell me the reason why the pressure increases regularly and why the reset valve starts to trip?? On the display, the heating symbol always flashes during the heating cycle of the appliance. What happened?

There is a problem with the temperature sensor of the heating circuit. There is no normal circulation in the heating system.

What is the problem if the boiler Buderus Logamax U072-24K is regularly turned off?? For example, recently the piezo ignition did not work at all. Appliance was serviced that week. What kind of malfunction?

There seems to be a malfunction in the smoke evacuation device. You have to check the chimney. Failure of the piezo ignition function means that one of the components is worn after a power surge or that water has entered.

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Please help to troubleshoot the chimney? Three days are coming soon, as there was a return draft, when the smoke began to billow immediately into the room. I made the chimney myself. It consists of a metal pipe. I think I made a mistake in the calculations.

The unit operates normally in the DHW cycle, but if you start heating, the water boils and the unit stops working. What can be faulty and how to fix it?

Possibly the circulation pump is out of order, the electronic board is defective, or the temperature sensor is broken. At the same time the filter screen might be clogged.

In the process of hot water supply the boiler alternately supplies hot and cold water. It is unclear what this depends on. How to adjust the water heating?

The heating system may have been clogged or the heat exchanger needs cleaning. In addition the pressure control sensor may be defective or the circulation pump may be faulty.

The main reason may be the wrong configuration of the chimney. There may be a deposit of soot on the walls of the pipe, which sufficiently reduces its efficiency. It is also recommended to check the ventilation holes in the house.

Operating a single-circuit boiler Buderus Logomax U072-18. It instantly sets the temperature over 96C, but then crashes with overheating. Later, when it cools down, it goes on reset. How to fix the breakage?

The failure of the overheating function indicates a malfunction in the circulation process. Initially, you need to watch the radiator taps. They should be left open. After the filter element is checked for cleanliness, and you need to make sure that the heat exchanger is not dirty.

I have started up this boiler in Autumn of this year. A few weeks later the appliance started making a lot of noise. Explain the reason for the noise?

Presumably the presence of scale in the heat exchanger. When the water is hard, lime deposits on the radiator pipe wall over time.

boiler, buderus, water

We think to connect a wall hung boiler Logamax Plus GB172 in a private house. Please tell me how to start up such a unit correctly yourself?

For the correct start-up of this equipment, the following steps must be taken. Reconnect the electrical supply to the machine. Open the gas cock. Then start the burner. Finally adjust the desired temperature.

We need to do maintenance. Can you give me advice on how to drain the unit yourself??

boiler, buderus, water

According to the manual, this operation should be carried out as follows. Disconnect the unit from the electrical supply. We close the gas valve. Open the automatic air vent. Turn the tap for the drain. After that, remove the leaking water. If necessary, allow the liquid to drain through the drain valve. This valve is located at the bottom of the appliance.

Can you tell me how to diagnose the operation of the three-way valve? There is a suspicion that this component does not open properly. On heating can not pump the outermost radiators, but on the hot water supply pipe under the boiler is warm.

You are right, we recommend that you check the 3-way valve regarding the acidification of the piston rod in the intermediate state. It is also advisable to inspect the heating system itself.

Common malfunctions and repair tips

Malfunction is considered typical, if it can occur in a boiler of any modification. it is a problem with the burner, combustion chamber, fuel supply, security system, electronics, sensors, etc.

Some problems are solved simply. by cleaning, screwing the contacts or reinstalling the part, they can be fixed by yourself. If a more serious repair is needed, we recommend to contact the service center.

The burner does not turn on after service

Often after the repair the boiler does not want to turn on, does not ignite, with no errors indicated on the display.

If you have decided to wash the pipes or change the radiators, and for this purpose have shut down the boiler and drained the water, then after refilling the system with water, attempts to turn on the boiler may fail

And the matter is in emergency thermostat. Let’s tell you how to repair and turn on the gas boiler Buderus after a forced outage.

The Logamatic control system has a safety temperature limiter STB. It is located to the left of the water regulator, under the cap. To return the limiter to its working position, you must remove the cap and press the button, then restart the unit

If after pressing nothing has changed, you need to change the overheat sensor. preferably at a service center, with a guarantee on the work done.

There may be other possible causes of idle time.

  • Turn on the start switch and emergency switch;
  • Check the operation of the circuit breakers, replace if faulty;
  • Check if the combustion products control system works properly, once it is blocked, restart it and wait for 15 minutes.

Modern devices have a restart button. It is always advisable to use it if various kinds of malfunctions occur.

Many units do not need to be recharged and will restart on their own. If the appliance is repeatedly started without use, it should be taken to a service workshop.

No spark or flame after ignition

If the starting process occurs in working mode, but the flame does not appear due to a lack of spark, you need to disconnect the ignition cable, turn it on again and listen.

No sound, a kind of clicking, indicates a breakdown of the ignition transformer, which needs to be replaced. If there is a sound, but the spark does not fly out. replace the ignition burner or electrode.

Original AE ignition device for a Buderus gas boiler. To save money, you can buy a Chinese analog, but the quality will be lower

The reason might be elementary. you simply forgot to unscrew the gas tap. Open the valve and try again.

Ignition can also be impeded by air s. It is recommended to bleed air from the radiators and the system through the Mayevsky cocks, examine the automatic device for bleeding air, then once again try to ignite the burner.

Ionization current problem

The unit will not operate if L and N are accidentally mixed up when connected, or if voltage is established between PE and L. Reconnect wires and check grounding, if necessary install an isolating transformer.

It may be a loose connection. terminal connections often become loose during operation and wires fall out. Tighten all connections or replace defective element

Ground fault can occur, the ionisation electrode must be repaired. If the ionisation current is below 1.5 mA, the ceramic part or the ionisation electrode core may need cleaning. The ignition burner may need to be replaced.

Noise in the machine

If you can clearly hear the sound of boiling. you need to thoroughly clean all nodes and parts in contact with the coolant. This is normally not a problem with regular, annual cleaning.

How To Drain and Fill a Hot Water Heater

Mineral buildup is most likely to occur in the heat exchanger where hot water is constantly circulating. Limescale is deposited on literally all elements of the unit

  • remove the cover of the unit;
  • Remove the heat exchanger;
  • Clean all elements from scale with a special agent;
  • Install the part in place.

In order to reduce the amount of deposits to a minimum, we recommend installing filters that reduce the concentration of salts in the water.

If you hear water noise during heating, which lasts longer than programmed, you should check the settings. Perhaps the problem is in the wrong operation of the pump. you need to check how the turbine works, adjust the speed.

Main malfunctions and repair of gas boilers Buderus Logano

Floor standing boiler Buderus Logano G234-44 WS can not start. As long as you hold the button, the burner works. If the button is not fixed, the appliance immediately goes out. What is the cause of this malfunction??

The element in the thermocouple or gas valve might be defective. There could also be a drop in gas pressure at the inlet line. In some cases there is a lack of voltage control board.

We have a malfunction. It is difficult to start. Ignition burner lights up, but there is no light on the main burner unit. I can’t figure out what’s the reason?

There seems to be a malfunction in the ignition unit. You need to carry out a technical inspection of the appliance and clean the ignition device.

Why the gas boiler Buderus Logano 32 kW does not stop working when it reaches the set temperature? It heats up to 90 C, after which it crashes. When restarting the cycle starts all over again.

Probably the board is damaged, the temperature sensor is broken, the overheating protection button has a defect. It is possible that the automatic regulation has failed.

Can you tell me why the coolant does not get warmer than 70 degrees? I need to adjust more, but the screen shows that this is the maximum value. How to increase the temperature of heating?

If the unit does not cycle to a higher temperature in the heating circuit, the following causes are likely. In the settings set the limit of the maximum temperature of heating no more than 70 degrees. The speed of the chimney draught is decreasing.

Buderus Logano G234-38 WS does not function satisfactorily in the heating cycle of the hot water supply. Alternating hot and cold water flows out of the tap. Explain the reason why this happened?

There is a tap under the boiler, water keeps dripping from it. The device itself does not work. What do I do?

There seems to be a bleeding of the heating medium through the safety group’s valve. In this case, it indicates an overpressure in the system. The valve for filling the system may not be closed or it is recommended to fill the expansion tank.

We would like to know why the pressure is continually rising and at the same time the bleed valve opens? The heating symbol lights up on the display every time the appliance heats up. How to be?

There is a problem with the temperature sensor of the heating line. The corresponding circulation process in the heating circuit has been interrupted.

For what reason the floor gas boiler Buderus Logano 44 kW constantly turned off? Say, the other day the ignition did not work at all. The unit was serviced in that month. What is it??

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We can assume that there is a problem with the smoke evacuation process. You need to check the chimney. If the ignition element does not function, this may be an indication that a component has been damaged by a voltage drop or water leakage.

Can anyone help fix a chimney problem? There has been reverse draft for two days with smoke coming straight into the kitchen. The chimney was done by yourself. It looks like a metal pipe. There seems to be a problem somewhere.

The device produces hot water well, but at the moment of starting the heating, the water immediately reaches boiling point and the unit shuts down. What is the problem and how can it be fixed??

Apparently the circulation pump is faulty, the control board is damaged, the temperature sensor is malfunctioning. Also the filter screen can be clogged with debris.

boiler, buderus, water

During the hot water cycle the appliance alternately supplies alternating hot and cold water. I can’t figure out what’s causing it. How do you fix the heating fluid??

Looks like a dirty heating system or a clogged heat exchanger. Also the sensor that controls pressure could be defective or the circulation pump could be broken.

Improperly configured chimney may be an important factor. Often happens soot contamination, which significantly weakens its efficiency. In addition, it is required to control the exhaust in the living areas.

Installed Buderus Logano G124 WS a week ago. The appliance suddenly reaches a temperature of over 96 degrees and then shuts down due to overheating. Subsequently, after it cools down, begins to start independently. What is the cause?

Overheating alarm indicates a circulation problem. You first need to check the position of the radiator cocks. They are installed open. Then an inspection is made for a clogged filter, and you should also make sure that the heat exchanger is not clogged.

Made my own installation of this unit in 2015. After about three months the unit started making noise. Please tell me what is the cause of the noise?

The heat exchanger is most likely blocked with limescale. If the water is hard, lime scale will accumulate in the radiator pipes.

Would like to connect the floor boiler Buderus Logano G234 to heat the house. Tell me how to start up such a machine properly yourself?

For the correct start-up of this appliance it is necessary to carry out certain activities. Connect power to the appliance. Open the gas valve. Then turn on the main burner. Finally set the required temperature.

We have plans to perform maintenance. Instruct how to properly drain the coolant from the unit?

According to the instructions, the procedure is as follows. Switch off the appliance from the power supply. Close the gas valve. Open the automatic air diverter. Fully open the drain cock. Then collect the spilled liquid. You can also drain the water using a safety valve. This component is installed at the bottom of the unit.

Please tell us how to check the three-way valve? There is a suspicion that this part does not open all the way. In the heating cycle can not pump the outermost batteries, and in the hot water supply mode the supply pipe under the boiler unit is strongly heated.

Repair of floor standing boilers Buderus

In operation floor gas boiler Buderus Logano G124 WS, control Logomatic 2107. In cold weather I noticed the following thing, heats the coolant to 76-77 gr. (AUT mode), then shuts off with a loud click in the control box, runs, cools down to 68-69 and again the same. Outside.34. Exactly the same when it warms up.18, but turns off the burner normally (without that loud “click”). It seems that some kind of protection is triggered in my head, what can it be and what to do?

TR thermostat (the one with the knob) is triggered. Relay on the board went off faster. The unit will heat the heat carrier until either the TR or the electronic sensor is triggered. If the knob is at 90, and the maximum setting of the boiler is set to 80, then up to 90 degrees it should not heat up.

The house (210m) is very cold in the cold season. Temperature 15. Boiler Buderus G234-35 BFU, sensor outside. The unit was giving out 80-90, 62-64 came into the system. The question is this. Do I need a sprinkler in my circuit?? The team who did it can not say anything with certainty, Trestovsky’s claim that hydrostrete is necessary.

The pump between the hydrostring and the boiler at what speed? Try to put the maximum. If it does not help, try a more powerful boiler pump. Pump power should be 15% more than all other pumps combined. Then the sprinkler valve would work as it should. And you, the return from the heating system goes into the supply. Do you need a sprinkler discharge?

Can you tell me if the Logamatic is on the boiler in a remote boiler room, BFU in the house, then I have to, and for each pump controlled in the house to drag its own pair of wires, etc. д. Doesn’t Buderus have any solution for remote boiler room? I see some Logamatic 4323 in their lineup, mounted on the wall. This doesn’t help me? True, nowhere can I see how to connect to the unit and the permissible distance from it.

Buderus Logamatic 4323. is a controller for a remote heating system. In the maximum configuration can control a heat pump, one boiler and up to 8 heating circuits with or without mixers, or up to 9 heating circuits without a boiler. You can connect one BFU to each heating circuit, but the BFU will only work correctly if the circuits are mixing. The maximum cable length for BUS bus, connecting the controller with the boiler up to 1000 meters. For each BFU to pull to the control unit its own pair of wires is not necessary. You can connect all the BFU’s to one pair of wires, making sure to observe polarity and correct numbering in the service settings of the controller and on the BFU themselves.

A Buderus Logano g125 boiler is installed, diesel burner, 3 heating circuits (2 radiators without offset, 1. TP with esbe mixer). There is also a BCH, a Buderus logalux. In addition, I purchased 3 BFU, one for each circuit. Basic settings which I have set in the automatics: Type of heating system. room regulator; type of downgrading. T room. Questions that I would like to find answers to: 1. When switching to down (night) mode, should the circuit pumps be completely turned off? If yes, what does it depend on? And should the boiler be stoked when it goes down (at night) or should it slowly give out the rest of the heat and only periodically reheat? 2. I correctly understand that in the direct circuit, the temperature is regulated by the pump, in the mixing circuit. mixing valve? 3. I am interested in the pumps work, as during the night time (according to the schedule) the electric boiler is turned on, which is connected to the diesel boiler in parallel, but does not have its own pump, that is, when the electric boiler is turned on, the coolant circulation is provided by the pumps of the heating circuits. Accordingly, I need a mode that keeps the pumps running at night. If you bind the operation of the pumps to the “frost protection”, the maximum setting, as far as I understand, is 1 degree overboard?

When selecting “room regulator”. pumps are turned off when the set room temperature is reached in any mode, day or night. If the outboard temperature is lower than the temperature specified in “Frost protection” (the factory setting is 1 degree). Changes to minus 20. Can be set individually for each circuit, then the pump turns on in any mode. If you select “Room temp.”You set the night room temperature. If this value is exceeded, the heating circuit is switched off. When the temperature is below the boundary value, the heating system maintains the set temperature of the night mode. So these settings are not suitable for your case in their pure form. At first glance, I see two possible solutions: 1. Heating system type “radiator” and “floor”. “Remote control”. “No display” 3. “Max. room temperature influence”. Question for a debate, I propose to set the radiators to 7, for the floors to choose so that there is no discomfort. 4. Setback type. “Decrease”. The only “but”, if the EC sufficient power, it is possible overheating of the room at night, because the pumps will run all the time. 2. By simple modifications we organize switching of the control command to switch between the boilers. During the day. Diesel, at night. EC. Then the EC will switch on only when it is really necessary. The only possible pitfall. When boiler water cools down below 40 degrees, the pumps are switched off to prevent condensation, and are switched on when this threshold is exceeded. And at parallel connection of boilers this moment can never come.

Please tell me if I can solve my problems with Buderus equipment? There is a 220m2 house with a boiler house 40m away. I would like to install a boiler there (something simpler). single-circuit atmospheric floor boiler and lay a heating main to the house. As far as I understand, the temperature in the room is measured by Logamatic itself? (Or some sensor hanging next to it)? But in the boiler room I planned to keep 5-10C. What to do in this situation? Is there any way to extend the Logamatic bus by 40m and place it in the house, away from the unit? What solutions does Buderus have for such cases??

Logamatic by itself does not measure any temperature, it receives data from the appropriate temperature sensors (street, boiler, boiler, under. or fr. lines, room, etc. д.). In your case, you need a room sensor BFU, tuned to the circuit that heats the room with installed BFU. The length of the connecting wire between the BFU and the unit’s control unit is no more than 100 meters.

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