Home Article Gas boiler pump buzzes

Gas boiler pump buzzes

If the gas boiler hums, it indicates a malfunction in its normal operation. Causes can range from installation error to scale buildup. The earlier the problem is identified, the faster it will be fixed. Operating the problematic equipment can be hazardous. Malfunctions can occur in any part of the machine. Therefore, it is necessary to analyze not only the nature of the sound, but also its source. This will allow you to quickly and accurately identify a possible malfunction.

Malfunction of the exhaust fan

Some models are equipped with fans. As a rule, these are units with a closed chamber.

As the fans rotate, they may begin to make noises because:

  • lack of fan lubrication. High temperatures cause grease to dry out quickly. This has a negative effect on the bearings, which simply fail;
  • Dirt deposits. Dust impairs performance. Therefore, it is necessary to periodically clean the fan.

Scaling of the heat exchanger sections

The water contains a lot of salts that causes scale formation on the surface of the equipment.

There will be a hissing noise when heated. Heating itself is slower than normal. Therefore, the radiator needs to be cleaned annually. Because in this part of the water moves slower than in the water supply pipes, which leads to increased deposition of salts.

boiler, pump, buzzes

A strong water pressure is often sufficient for flushing. In severe cases chemical reagents are used. This is an extreme case, because chemicals can provoke the formation of cracks in the radiator, previously clogged with scale.

Low gas pressure

The pressure in the apparatus may drop due to the following reasons:

  • There has been a water leak in the appliance.
  • The boiler has been installed or adjusted incorrectly.
  • Defects in the expansion tank of the unit.
  • The boiler specifications do not match the load placed on it.

Low pressure causes the equipment to emit loud noises. If a malfunction is detected, it is recommended to inspect the appliance for leaks. Particular attention is paid to the area of joints. It is convenient to carry out the inspection with a cloth. If holes are found, they must be closed.

It is worth noting that when the pressure drops, the equipment automatically stops working. Gas pressure is affected by water pressure. When one indicator drops, the second drops to the minimum at once. The boiler shuts down automatically.

It is advisable to find out the optimum values to periodically check the condition of the gas unit.

Lack of water in the system

It was noted that the water level and the gas level affect each other. If one indicator goes down, the other automatically goes down as well. The reason for the deterioration of the water pressure level can be found in the airlocks. Because of this, the amount of incoming water decreases. Air creates obstacles for normal liquid circulation.

Lack of liquid is dangerous because it causes overheating of the boiler. Therefore, clicking noises can be heard when it is operated. Such clogging provokes a decrease in the heat output of the device, reduces or blocks the circulation of coolant.

The following factors can lead to such consequences:

  • Depressurization occurred during repair work on the risers;
  • The integrity of the system has been disturbed;
  • preventive measures to replace the devices and their components.

If the gas boiler whistles in a private home, it is the first sign of air s in the system.

To fix the problem, it is recommended to adjust the thermostat. Also check that it is set correctly. You can refill the water yourself or adjust the water supply in the heating system. Many boilers are equipped with a special lever to reduce the water pressure.

Air gaps in the system

When the heating boiler clicks, the problem may be the formation of a large amount of air in the system. This problem is particularly important if the device has been in operation for a long period of time.

When the gas boiler knocks during operation, it is necessary to bleed the excess air. Modern models are equipped with special taps. They are unscrewed and vented. Always set a bucket in advance, where the water will be drained. It is important to act carefully. After venting screw the valve back on. After that the knocking during operation should stop.

The wrong settings on the boiler

The boiler hums strongly due to the wrong adjustment of the equipment. The equipment literally howls at such a malfunction. Errors in the settings can provoke incorrect load distribution, which will only damage the equipment.

If the gas appliance is running at high power, it may be rattling. This signals that the unit has exceeded its standard values. If you feel vibration, it means that the circulation pump is noisy and the problem is overpressure.

When the boiler when heated makes sounds similar to the impact of metal on metal, this indicates that the hinged brackets, located on the radiator, are installed with errors. The result is uncompensated expansion of the bodies.

If the gas boiler hums, it is recommended to check whether its settings are correct. Beforehand study the configuration of the equipment. This will allow you to find out what values should be set for normal operation of the device. If necessary, the power of the pump is reduced, the location of the ignition electrodes is adjusted, they are cleaned.

It is the fault of malfunctions with the ignition of the boiler when turning on hot water makes a loud popping noise.

Gas boiler circulator pump making noise

Why the noise in the gas boiler: why the unit hums, clicks, whistles, pops how to fight

My home is my castle, and in the castle, everything must work like clockwork. Agree, returning from work, we dream to relax and enjoy the comfort, but not to fix the crane, boiler or to understand why the buzzing gas boiler. However, it is important to understand the causes of problems at the first signs of a problem.

According to the rules of operation of gas equipment regular inspection and assessment of the technical condition should be carried out by gas inspectors. But they can’t detect all impending dysfunctions, because.к. are not obliged to visit clients on a daily basis. That is why it is important to keep an eye on your appliances and to know what you should pay attention to.

In this article, we will tell you what signals the noise during the operation of the gas boiler, as well as why it whistles, buzzes, pops or clicks. Timely identification of the cause of the sounds will help prevent breakdowns, extend the life of gas consuming units, and make your life more comfortable and safe.

Why the gas boiler hums. causes and solution methods

Users, as a rule, give preference to quiet gas boilers. If the unit is serviceable, it should not make too loud noises. But there are times when the boiler emits an abnormal hum. Then the question arises why the gas boiler hums. If it is new, then in most cases the malfunction does not appear here, just some new elements increase and shrink under the influence of temperature differences. It takes time for them to get into working shape and fall into place.

The most common reasons why a gas boiler hums heavily are:

  • Malfunctions in the work of the fan;
  • A large amount of oxygen in the heating medium;
  • Sediments on the parts;
  • Decrease of gas pressure.

Sometimes the reason why a two-circuit gas boiler hums is the malfunction of the fan. Lack of lubrication, contamination of the blades leads to this. In this case it is necessary to clean the fan and lubricate the bearing with oil. If necessary, the broken part is replaced with a new one.

Humming gas boiler can be monotonous or periodic with crackling. A smooth noise occurs even in new units. In this case boilers with natural circulation are usually noisy. The cause is an excessive amount of air in the heating medium. The fact is that when the water is heated, many air bubbles form in the water, which produce noise. This is the answer to the frequent question of consumers, why the gas boiler hums when heated. Such noise does not indicate a malfunction in the gas unit, but gives a certain discomfort.

The problem can be solved by converting the system to a closed. The type of system can be changed by installing valves and replacing the expansion vessel with a diaphragm type. It will also be useful to connect the automatic weather control system. These measures will help extend the life of the unit.

Another not uncommon reason why the gas boiler hums heavily is the accumulation of lime sediment. When the coolant is heated more than 60ºC, limescale begins to actively develop, which over time clogs the tubes of the heat exchanger. In this case, the heat exchange between the circuit and the heat transfer medium will be reduced and the unit efficiency will be significantly reduced. Under the influence of circulating water, lumps of scale break off and give way to movement, as they hit the metal walls of the heat exchanger and create a tapping noise.

The problem is solved by cleaning the heat exchanger. However, flushing can only be done to normal circuits. If the bithermal heat exchanger becomes clogged, you will only have to throw it away and buy a new one. In addition, such circuits clog faster than the classic separate counterparts.

After installing a cleaned heat exchanger in the gas boiler, it will stop making noise.

In some cases, the noise in the gas boiler causes a decrease in gas pressure. Because of this the circulation of water in the system is reduced, and there are air s. As a result, the unit overheats trying to reach the desired temperature and starts humming.

You can eliminate the noise by solving the problem of low gas pressure. The causes of low pressure can be:

  • Low pressure in the main line;
  • contamination of the gas line;
  • presence of leakage (accompanied by a characteristic smell of gas);
  • Faulty gas meter.

If the “root of the problem” in a leak or low pressure in the centralized line, then only representatives of the gas service can help here.

If the gas line is clogged, it must be cleaned. If there is a breakage in the gas meter, the fuel will pass through it with difficulty. Noise and crackling coming from the meter is a symptom of meter malfunction. After replacing the measuring device with a new one, the pressure will return to normal and the noise will stop.

Please note! It is necessary to know the optimum readings of gas pressure and periodically measure it. The value should be within 1.5-2 atmospheres.

There are other reasons why the gas boiler hums or makes noise:

  • Improperly set bypass or gas valve, which leads to howling sounds.
  • If the power of the gas device has exceeded the required power, this often leads to vibration and a rattling sound.
  • If there is not enough coolant in the system, the gas boiler will also make a vibration noise.
  • If a rattling noise occurs, it may be due to a faulty installation.


Units of this type are divided into two groups: wet and dry. The latter are equipped with a fan, which even in normal mode works noisily, as the manufacturers and sellers warn. If backlashes appear during operation, the noise intensifies. Such a device should be installed in a separate room with good soundproofing. But sometimes experts install it in the living room or kitchen, arguing that it is highly efficient.

If the wet unit made a noise, you will need to make a diagnosis of the entire heating system. In the course of this work, it may turn out that it is not the water device that is to blame. the squeaking is heard for another reason. It will need to eliminate. If you follow the rules of installation, start-up and operation of the heating system, there will be fewer problems.

Causes of noise in the pump

The pump in the heating system makes noise for many reasons, but most often the problem is related to one of the following factors:

  • Unstable voltage in the mains. Quite a common problem, due to which the pump in the boiler is noisy. voltage fluctuations. Because of the differences, the operation mode of the pump is disrupted, and it begins to pump the coolant unevenly. It is the coolant that will be noisy when passing through the pipes and radiators. To accurately identify such a problem, you need to do a complete test of the heating system and pump, and without special equipment is not doable.
  • Installation errors. If a distinctive rustling can be heard from the device, it is necessary to check whether it is properly installed. In most cases, pumps are installed together with a hydro-compensator, which monitors the static pressure during the operation of the device. Hydronic compensator (or diaphragm tank) prevents the occurrence of stresses that cause wear and hum of the heating pump.
  • Air clogs. At the very beginning of the heating season, when the system is just starting to work, a characteristic whistle can be heard from its side. Such a sound effect indicates that the heating system circuit has air, which is the cause of whistling. For elimination of air s traditionally use the Mevsky cocks, usually installed in the uppermost areas of the circuit. Such taps must be used before each start-up of the system to ensure that there is no air in it.
  • Improper pump selection. Another popular cause of noise is related to mistakes that were made when selecting pumping equipment. Improperly selected heating pump knocks every time you start the system, so it is best to choose the option, the characteristics of which are suitable for the particular situation. In addition, the mismatch of the required power always leads to increased wear and tear of the working elements of the device. and then the pump will be noisy for the next reason in this list.

Equipment malfunction. If there is always a noticeable noise coming from the pump, there is a very high chance of damage to the rotor or impeller. An indirect sign of such malfunctions is a decrease in the efficiency of the heating system. Since the described problems are quite serious, to eliminate the problem you will need a full repair of the equipment or its replacement. Sometimes the pump can hum due to the wear of certain elements and the increase in the gap between them. in this case, to eliminate the noise you need to replace the adjustment washers. Also the cause of the noise can be damage to the wiring, and in this case you have to go to the experts. fixing such a problem yourself without proper experience is very difficult.

Why the circulating pump of heating system is noisy

The owners of country houses and cottagers install individual heating. There are several reasons for this lack of a centralized line, the ability to choose the most economical scheme, the convenience of heating when you need it, not at the beginning of the heating season, etc.д.

One of the main devices in such a system is a heating circulating pump. Its main task is to create a forced circulation of hot fluid for heating the room. Noise during its operation is a serious cause for concern, especially if there are extraneous sounds in the midst of the heating season. There may be several reasons, let’s try to analyze the main ones.

Any equipment with electric motors, pumps, fans, water and gas circuits through which water and gas flows makes noise and even buzzes. Developers of gas boilers make every effort to reduce the sound level to a minimum.

Ideally, nothing will make noise or hum when in operation. Another thing. at start-up, when all the components and units of the gas boiler are working on warming up. If the gas boiler hums when turned on, it requires maintenance and cleaning.

The main reasons why the equipment in the process of operation makes extraneous sounds:

  • Abnormal operation of the fan;
  • Breaches in the operation of the burner device;
  • The flow of liquid in the pipes and heat exchanger can hum;
  • malfunction chimney or pump.

There can be more reasons for the noise. Not all of them makes sense to respond, since the quiet and not ringing sounds are a consequence of the normal operation of automation. Noise can occur due to worn parts of the gas boiler.

It can be a cause for concern if the gas boiler hums with a low, vibrating bass, or there are sharp, ringing sounds in the noise.

Fan failure

The gas boiler blower has several operating modes, so the sounds from the impeller operation are usually low, rustling. If it is damaged, the sound will change to a ringing crackle. The impeller may also hum if imbalanced, for example, after unsuccessful cleaning of the gas boiler, or if a foreign object got inside.

The motor may hum if the shaft on which the impeller is attached has been struck. The motor will hum at any mode of the gas boiler, while the propeller will change tone depending on the speed of rotation.

The problem can be eliminated by replacing the impeller or motor.

Water saturation with oxygen

Water flow moving through the pipes inside the gas boiler can hum. Often the low humming sound occurs as the water is heated in the secondary heat exchanger.

The reason why a gas boiler hums when heating water is due to the release of oxygen dissolved in the water stream. Gas absorption occurs during operation of a high pressure pump from a well or centralized water pumping station.

Cold water dissolves oxygen well at low temperature. When heated in the heat exchanger, gas is released, and at a certain temperature, the bubbles collapse with a hum. This is roughly how the kettle of water on the stove hums before it begins to boil.

Nitrogen dissolves in water worse than oxygen. Most of it remains “overboard” at the stage of pumping the water into the pipe system by the well or pumping station pump. Therefore, a water flow saturated predominantly with oxygen enters the gas boiler. It is because of its collapsing bubbles burns the primary and rusts the secondary heat exchanger.

Pressure drop

A low sound, even a hum, can occur if the water pressure in the heating system is insufficient. Often buzzes floor standing gas boiler, which does not have a smoke and circulation pump. Usually such heating systems work on an open circuit with gravity flow.

Oxygen from the air dissolves freely even at room temperature. The pressure in the heating circuit is slightly higher than atmospheric pressure, so the process of bubble release occurs slowly when heating water in the heat exchanger.

A two-circuit boiler can buzz if the water pressure in the hot water heating circuit is less than a safe minimum of 1 bar. This is dangerous for the boiler. The situation can occur if the pressure sensor fails or the settings on the control board are incorrect.

Boiler hums at high tones. At low water pressure around the impeller of the circulating pump is a zone of cavitation or cold boiling of the liquid. Cavitation force easily destroys the bronze of the ship screws, and the plastic impeller of the pump can destroy in a few hours. Therefore if the boiler hums near the pump it is necessary to stop the gas equipment before it finally breaks down.

The boiler pump can get very humming the first time you start a new gas appliance. In this case it is not in the cavitation, but in the debris that got into the pipes during the assembly of the heating system by unscrupulous installers.

Sediment on the elements of the gas boiler

Noises and extraneous noises often occur when limescale is deposited on the inner surface of the heat exchanger. About once every five years, the heat exchanger should be flushed with special fluids.

The heat exchanger is dismantled and washed on a special stand under pressure. Any attempts to remove lime scale in an artisanal way usually cause burnt copper walls.

Heating circulating pump cracks

Owners of country houses and dacha owners install individual heating. There are several reasons for this. the lack of a centralized main, the possibility of choosing the most economical scheme, the convenience of heating when it is needed, not with the beginning of the heating season, etc.д.

One of the main devices in such a system is a heating circulating pump. Its main task is to create a forced circulation of hot fluid for heating the room. Noise during its operation is a serious cause for concern, especially if extraneous sounds appear in the midst of the heating season. There may be several reasons for this, we will try to analyze the main ones.

Overheating the body of the pump: the main causes and options for their elimination

If a hot case is detected, the consumer should immediately stop the fuel supply to the boiler and stop the electric pump. To be able to further cool the internal heating surfaces of the boiler, open the bypass or bypass line of the heating network so the coolant circulates in natural circulation and thereby cools the boiler. Next, the user should try to identify the reasons why the circulating pump of the heating system is heating. The heating of the structural components of the pump can occur for the following reasons:

  • The assembly of the device is not performed in accordance with the technology established by the equipment manufacturer.
  • Clogged pipe system. Deposits of hardness salts and rust in the inner surface. With many years of operation, they sometimes reach such a size that they can completely overlap the passage section of the pipes. This occurs particularly often in areas with poor circulation. In order to push water through a clogged section, the pump overloads, this mode causes overheating of the electric motor.
  • Entry of a foreign body, a similar cause of heating of the casing, only the pump is clogged with foreign debris and slag inside.
  • the bearings are not lubricated. This fault is more common in “dry” units.
  • Low quality parameters in the mains, less than 220 V.
  • Internal causes of electrical failure.



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