Why the gas boiler is noisy: why the unit is buzzing, clicking, whistling, clapping + how to fight

Vasily Borutsky
Checked by a specialist: Vasily Borutsky
Author: Alena Bevz
Last update: November 2019

My house is my castle, and everything should work like a clock in a castle. Agree, returning from work, we dream to relax and enjoy the comfort, and not repair the faucet, boiler or understand why the gas boiler is buzzing. However, it is extremely important to understand the causes of the problem during the manifestation of its first signs.

According to the rules for the operation of gas equipment, regular inspection and assessment of the technical condition must be carried out by gas workers. But not all brewing irregularities in their work they can identify, because Not required to visit customers daily. Therefore, it is very important to independently monitor the technique and know what to pay attention to.

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

Causes of noise in heating equipment

The new gas boiler runs virtually silently. However, over time, the unit begins to make noise.

This is a sign of hardware failure:

  • scale formation;
  • the fan is out of order;
  • wear of the components of the apparatus;
  • manufacturing defects;
  • incorrect setting or installation of the boiler.

To understand why a gas boiler makes a loud noise, you need to listen to the noise that the equipment makes.

If a buzz is heard directly from the boiler, check the water level and top up if necessary. If noise is heard from radiators or piping, air has entered the system and needs to be removed. Extraneous noise in the pump itself indicates factory defects.

Gas boiler without front panel
The clicking sounds that sound at small intervals indicate a problem with the fan.If the boiler hisses or whistles, it means that a lot of scale has accumulated in the device

In the event of a breakdown of the circulation pump, the replacement of this element is often required. The gas supply to the system needs to be regulated from time to time. High pressure is undesirable.

Failure with a vent fan

If extraneous noise is heard at intervals, check the fan. Its task is to systematize the operation of the smoke exhaust system, due to which combustion products are removed from the boiler with the intensity necessary to ensure the full safety of those around them.

Gas boiler fan
The fan blows through the system, cleansing it of the remnants of combustion products, and also serves to remove smoke. The longer the boiler runs, the greater fan wear

The main reason is age. Most likely, you just need to replace the fan with a new one. The second reason, which leads to rapid wear of the cooler, is its location above the burner in the upper part of the device.

Under constant exposure to high temperatures, the bearing grease dries quickly, causing it to wear out. To solve the problem, a fan replacement is also required.

Another reason for the appearance of extraneous noise effects - the part may be clogged with dust, to remove which you need to do the following:

  1. Inspect the fan. If necessary, it should be cleaned. The main blades are inside the housing. It is necessary to remove dirt and dust from them, and then grease the bearings.
  2. If the problem persists, replace the obsolete valves with brand new ball valves.
  3. If the previous two actions did not work, reinstall the cooler.

It is better to entrust the replacement of parts to the master of repairing gas boilers from the service with which contract signed for the maintenance of appliances and the supply of blue fuel. Timely and competently carried out replacement of worn parts will eliminate the need to buy a new unit.

Scale deposits on heat exchanger walls

Thanks to the heat exchanger, heat is redirected from gas to water. If the water is hard, then scale can form in the heating system during its heating. To remove mineral deposits deposited on the walls, it is recommended to regularly conduct a chemical flushing the heating system and cleaning the heat exchanger.

Scale on the heat exchanger
Household chemical means for washing the heat exchanger can be purchased at the store. Craftsmen often use 4% vinegar for these purposes. After cleaning, wash the parts with water.

This malfunction is noticeable already after 15-20 minutes from the moment of starting the gas boiler. The reason for the appearance of sounds is the narrowing of the passage for water. As a result, steam and small bubbles form. Scale reduces the efficiency of the equipment, as well as its heat transfer and wear resistance.

Descale the machine by chemicals containing soda and the like. You can do it yourself. To do this, remove the heat exchanger, remove the casing and unfasten all connected pipes. A special chemical solution must be poured into the device for 2-5 hours.

Lack of water in the heating system

If insufficient water runs through the heating system, the boiler starts to make noise due to overheating. This is because air plugs form inside that interfere with the normal circulation of the fluid in the system.

Radiator tap for airing
Airing the system leads to incorrect boiler operation. If there is not enough water in the pipe section, an air lock is formed. The heating device partially cools down, and water cannot circulate normally in the system, therefore it overheats with the burner. In this case, a dull whistle or howl is heard

Airing leads to the following problems:

  • decreases or stops the circulation of water in the coolant;
  • the boiler automatically shuts off due to overheating of the coolant.

The reasons why air is in the heating system:

  • violation of sealing during repair work;
  • violation of the integrity of the system;
  • water drainage from the DHW circuit.

To adjust the operation of the device, you need to adjust the thermostat. You also need to make sure that the thermostat is installed correctly, add water, adjust its flow and circulation.

Get rid of air in the system will help Mayevsky cranewhich is mounted in the end of the radiator. It provides a fitting, opening which you can access the inside of the battery. The crane is most often installed in the upper part of the device, where warm air accumulates.

You can also use an air separator. The device collects air that collects while circulating the water into bubbles. When the excess air is completely removed from the pipes, replenish the coolant through the make-up valve and make sure that the boiler works without extraneous sounds.

Prevent air accumulation in coolant allow the arrangement of a perfectly sealed heating system. This is troublesome and expensive, but it eliminates the occurrence of extraneous noise in a gas boiler.

Low pressure effects

Reasons why the pressure in the system may decrease:

  • water leak;
  • breakdown of the boiler expansion tank;
  • a long break in the supply of electricity;
  • incorrect setting of the gas boiler.

If pressure drops in the system, the boiler starts making loud noises. First, your task is to check for leaks in the heating circuit. A simple napkin will help you with this, which you need to wipe all the joints and joints. Having discovered the source of the leak, it must be eliminated.

Finding the cause of the noise of a gas boiler
If the pressure in the system drops, the boiler stops working because it is blocked by automation. The lack of water in the heating circuit leads to overheating, it is fixed by sensors, after which the boiler turns off automatically

Cracks in the expansion tank or heat exchanger can cause pressure changes. To identify their location, all water should be removed from the system, and then using the compressor to pump air into it. In places of microcrack formation with a characteristic whistle, air will ooze. The appearance of microcracks indicates wear and the need for a complete replacement.

This occurs as a result of frequent flushing of the system with chemical reagents, due to poor quality metal, a sharp increase in pressure in the line, water hammer. If you can remove and repair heat exchangerthen the resulting microcracks can be soldered.

In order to prevent such problems, it is recommended to regularly audit the boiler, as well as install auxiliary equipment that will allow you to control the pressure by displaying the value on the screen. Standard pressure indicators are 1.5-2 atmospheres.

Incorrect unit setup

Incorrect setup or installation of equipment can also cause howling of the valve or bypass. Extraneous noise can occur as a result of improper load balancing.

Master inspects the boiler
If the operating power of the unit exceeds the permissible values, then as a result of excess pressure, vibration occurs and the pump begins to rattle

If, during heating or cooling, the sound of a metal strike on metal occurs, an uncompensated expansion of heat is generated in the device. The reason lies in improperly mounted radiator hinged brackets.

If you do not know why the gas boiler constantly whistles, you should first check the settings. The rules and sequence of actions when setting up a gas boiler can be found in the technical documentation for the unit, operating parameters - on the nameplate mounted on the equipment case.

When the boiler is turned on, popping sounds

If during the switching on of the gas boiler extraneous noises are heard: pops, clicks, knocks, you should proceed without hesitation to start searching for the problem.

Three way gas valve
A three-way valve is the main unit of a double-circuit gas boiler.Its task is to regulate the redistribution of flows during the inclusion of hot water. If the cause of extraneous noise lies in the valve, that it has failed and the part must be replaced

What to do if the gas boiler slams sharply when turned on:

  1. Faulty three-way valve. This device sends water in a small circle when taking sanitary water from taps. If it clicks, then it needs to be replaced.
  2. Continuous spark ignition. During ignition, the resulting excess gas flashes up and a characteristic cotton is heard. In this case, it is recommended to check the igniter, burner, electrode, as well as all contacts.
  3. Chimney or filter clogged. In this case, their cleaning is required. Checking the chimney is carried out by a lit match. If the flame deviates, everything is normal, if there is no draft, cleaning is required.
  4. Installation error. If the equipment is not installed correctly, but when heated, the metal deforms and pops. The same sound occurs when cooling, as the metal returns to its original position. When switching to the supply of hot water, the boiler buzzes. The problem is solved by reinstalling the gas boiler.
  5. Nozzles clogged. A thin wire is used to clean them. First turn off the gas.

If the boiler vibrates during operation, it is recommended to lay a gasket under the housing.

Causes of extraneous noise in various models

Why regularly clicks gas boiler Navien? Two reasons are likely: scale formation and problems with the coolant.

How to fix the problem yourself:

  • disassemble the device;
  • clean or replace the heat exchanger;
  • check cranes;
  • lower water temperature.

Extraneous noise is also noted during the operation of gas boilers brand Beretta.

Typical reasons:

  • poor heat transfer in the heat exchanger, scale formation;
  • wrong pipes connected.

Why does the Concord gas boiler whistle? The most common reason is increased stress in the cold. The boiler capacity declared by the manufacturer is not true and in practice the indicators are less.

For example, if the documentation says 13 mbar, then in reality it is 10 mbar. Do not set the operation of the device to maximum.

Gas boiler cleaning
It is recommended to clean the gas boiler at least once a year. For this purpose, you can contact the service center or carry out the procedure yourself

In a Baksi gas boiler, noise most often occurs when the heating function is turned on. To identify the cause, check the bypass, and also clean and adjust the valve. AOGV device users often complain about whistling. The reason is scum and a clogged filter.

Vailant boilers buzz after turning on the heating function and turning off the fire. The first reason is that the strainer in the heating circuit is clogged; cleaning it will correct the situation. The second reason is a valve malfunction on the bypass line. To solve the problem, adjust the valve.

The reason for the noise in Ariston boilers is the poor circulation of the coolant. Blowing out the heat exchanger with a compressor will solve the problem. If the gas boiler Ardelia is buzzing, check that the pump is set correctly. If the situation cannot be corrected by this method, it is recommended to replace it with a new circulation device.

Conclusions and useful video on the topic

The cause of noise during operation of the gas boiler:

Whatever gas boiler is installed in your home, first of all, make sure that it is installed correctly. Equipment needs regular routine inspection. This will allow you to identify and fix problems on time.

It is periodically recommended to clean the coolant from dirt and scale. These simple manipulations will allow the device to work as long as possible, efficiently and without extraneous noise.

Have you ever encountered a gas boiler popping, clicking, whistling, or noisy? How did you fix this problem, or what services did you contact?Share your experience with readers in the comments and ask your questions to our experts.

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