The situation when the refrigerator is chirpingis familiar to many owners of household appliances. This haunting sound, reminiscent of the trill of a cricket or the work of a typewriter, can unsettle even the calmest person. This noise is especially annoying at night, when silence reigns in the apartment, and the unit continues its monotonous “song”.
The reasons for the occurrence of extraneous sounds can be completely different: from a banal distortion of the case to a serious breakdown compressor or start relay. It is important not to panic ahead of time, but also not to ignore the signals that your equipment gives. Understanding the nature of sound is the first step to solving the problem and restoring a comfortable atmosphere in the kitchen.
In this article we will examine in detail the mechanics of the occurrence of chirping sounds, methods for diagnosing them and ways to eliminate them. You will learn to distinguish the normal operation of the system from the harbingers of a breakdown, and also learn when you can cope on your own, and when you need to call a specialist.
The nature of sounds: how the compressor works
The main source of noise in the refrigerator is the compressor. This is the heart of the cooling system, which compresses the refrigerant and forces it to circulate through the tubes. Modern models use inverter linear compressors, which operate much quieter than older analogues, but they are not immune from the occurrence of characteristic chirping.
When you hear a sound similar to chirping, most often this is due to vibration of internal mechanisms. Metal parts, tubes and casings can resonate at certain motor frequencies. If the compressor housing is poorly secured or the vibration insulation is worn out, the sound is transmitted to the entire metal box of the refrigerator, increasing significantly.
A quiet hum and periodic clicking when turning on or off is considered normal. However, if the refrigerator chirps constantly or makes sounds similar to metal rubbing against metal, this indicates an imbalance in the system. In such cases vibration can lead to separation of process tubeswhich will cause a freon leak.
Diagnostics of the starting relay and electrics
One of the most common reasons why a refrigerator makes sounds reminiscent of a cricket is a malfunction of the start relay. This small element is responsible for starting the compressor engine. If the relay contacts are oxidized or burned, when you try to start, an electric arc occurs, which creates a characteristic crackling or chattering sound.
To test this hypothesis, you need to disconnect the device from the network and remove the back panel. Visual inspection of the relay often shows traces of burning or melting of the plastic. If starting relay faulty, the compressor may hum, click, but not start, or start with a loud sound.
- 🔌 Symptom 1: The sound is heard immediately when you try to start the motor.
- 🔥 Symptom 2: The compressor heats up more than usual, but no cold is produced.
- 🔊 Symptom 3: The sound is like a frequent clicking or crackling sound that lasts several seconds.
Replacing a relay is a simple and inexpensive procedure. However, it is important to choose a part that is compatible with your model refrigerator. An incorrectly selected relay can burn the compressor windings, which will lead to expensive repairs.
Vibration of tubes and housing elements
Often the reason lies not in a breakdown, but in a banal imbalance. During operation, transportation, or even just from time to time, the copper tubes of the circuit may shift and begin to touch each other or the walls of the compressor housing. When the motor is running, they begin to vibrate and make a rattling or chattering sound.
To fix this problem, you need to carefully remove the back cover and visually inspect the space around the motor. Sometimes it is enough to simply move the tube slightly with your hand (always with the refrigerator unplugged!) or adjust the casing so that the sound disappears. It is also worth checking the fastening of the compressor compressor to the frame.
Particular attention should be paid to the condensate collection tray located above the compressor. If it is not secured tightly, the vibration of the motor is transmitted to it, turning the tray into a resonator. In some models, a piece of foam rubber or rubber is placed under the tray to dampen vibrations.
☑️ Checking vibration
Problems with the fan in the No Frost system
If your refrigerator is equipped with a system No Frost, The source of the whirring may be the fan. It is located in the freezer compartment and circulates cold air. Over time, the fan bearings wear out, or ice freezes on the blades, which leads to imbalance and noise.
The sound in this case often changes: it appears and disappears. This is due to fan cycles. If the blades touch ice, the sound will be similar to friction or intermittent chirping. In such cases, defrosting the refrigerator within 24 hours is required.
If the sound returns after complete defrosting, then the problem is mechanical. It is possible that the grease in the bearing has dried out or there is play in the bushing. Replacing a fan is a standard repair procedure that you can do yourself if you have the skills to work with the tool.
⚠️ Attention: Before any manipulations inside the refrigerator or freezer, be sure to disconnect the device from the power supply. Working with live electrical components is life-threatening.
Table: Types of noise and their causes
To more accurately determine the cause of the malfunction, compare the nature of the sound in your refrigerator with the data in the table below. This will help narrow down the search and understand which part needs to be checked first.
| Sound type | Probable cause | Required actions |
|---|---|---|
| Monotonous chirping | Vibration of tubes, unstable position of the case | Align the legs, adjust the tubes |
| Crackling sound when starting | Malfunction of the start relay | Replacement of the relay |
| Noise with periodic knocking | Wear of fan bearings (No Frost) | Defrosting, replacing the fan |
| Loud hum and vibration | Incorrect installation, touching walls | Move away from the wall, check the gaps |
Why do old refrigerators make more noise?
Old models are equipped with piston compressors, which are noisier by design. In addition, over years of operation, rubber shock absorbers wear out, and the metal begins to resonate more strongly.
When you need to call a specialist
It is not always possible to eliminate chirping with your own hands. If the sound persists after checking the tubes, replacing the relay and defrosting, the problem may be deeper. For example, wear of the piston group of the compressor or a violation of the refrigerant circulation require professional diagnostics.
A dangerous signal is the situation when the refrigerator is chirping and at the same time it stops freezing. This indicates that the compressor is idling or there is a freon leak. Operating equipment in this mode will lead to complete failure of the motor.
It is also worth contacting specialists if you are not confident in your abilities. Repairing complex equipment yourself without experience can lead to more serious damage. A professional technician uses special equipment to measure pressure and check electrical parameters.
⚠️ Attention: Opening the sealed refrigerator circuit (pipelines) without a license and special equipment is prohibited and dangerous. This can lead to the release of harmful substances and a violation of the tightness of the system.
Noise prevention and proper care
In order for the refrigerator to operate quietly and for a long time, it is important to install it correctly. The floor must be level, and the distance to the walls must meet the requirements of the instructions (usually at least 5-10 cm). Regular defrosting (for drip systems) will prevent the formation of excess ice, which can interfere with the operation of the fans.
Periodically check the tightness of the doors and the condition of the seals. If the door does not close tightly, the compressor is forced to work more often and harder, which increases the load and noise level. Wipe the back of the condenser grill from dust to ensure good heat transfer.
Following simple operating rules will extend the life of your equipment. Do not overload the refrigerator with food so as not to disrupt air circulation. Make sure that the dishes inside do not touch the walls and do not rattle from vibration of the shelves.
Why did the refrigerator start to chirp after defrosting?
After defrosting, water could get on the electrical contacts or in the fan mechanism. Also, during assembly, shelves or trays may not have been securely fastened. Allow the equipment to dry completely (24 hours) before turning it on.
Is it possible to lubricate a compressor if it is noisy?
Modern compressors are sealed and do not require lubrication. Attempting to drill an oil hole will result in freon leakage and failure. If the compressor is noisy due to internal problems, it needs to be changed.
Is it normal for the refrigerator to click when turned off?
Yes, a single click when the compressor turns off is the normal operation of the thermal relay or just the metal cooling. Only frequent crackling or chattering noises during operation should sound an alarm.
Does filling a refrigerator affect the noise level?
A full refrigerator operates more stable and quieter, since food accumulates cold. An empty unit may turn on more often, and loose objects inside may rattle from vibration.
What to do if a new refrigerator rattles?
New equipment may make noise during the first few days of operation (break-in period). If the sound does not go away after a week, check the installation and shipping bolts (if there were any on the compressor). If the noise persists, request an exchange under warranty.