The situation when the refrigerator starts to turn on too oftenis familiar to many owners of household appliances. Instead of the usual operating cycle, where the motor rests for a significant part of the time, the compressor starts every 5-10 minutes or works almost without interruption. This is not just an annoying noise that interferes with restful sleep or rest, but also a sure sign that the cooling system is unable to maintain the set temperature.
Constant engine starts lead to critical overheating of the windings and rapid wear of the mechanical parts of the compressor. If you do not figure out in time why refrigerator it behaves incorrectly, you may face an expensive replacement of the motor or complete failure of the unit. It is important to understand that frequent starts can be caused by both trivial reasons, such as a door that is not tightly closed, or serious technical faults.
In this article we will analyze in detail the algorithm of actions for self-diagnosis. You will learn to distinguish problems with thermostat from a freon leak or a faulty start relay. A competent approach will save the family budget and extend the life of your refrigeration equipment, avoiding critical breakdowns.
⚠️ Attention: Before starting any work related to disassembling the case or checking electrical contacts, be sure to disconnect the refrigerator from the power supply. Working with a voltage of 220V requires strict adherence to safety precautions.
The main reasons for frequent activation of the compressor
The first thing to do when faced with a problem is to analyze the nature of the operation of the equipment. If refrigerator hums, then a pause follows, and after a short time the hum resumes, this indicates a violation of the thermal balance. Most often, the reason lies in the fact that too much warm air enters the chamber, and the unit simply does not have time to cool the volume to the required values.
One of the common reasons is a violation of the seal sealing rubber on the door. Over time, the material loses its elasticity, cracks or comes away from the canvas. Through the resulting cracks, warm air constantly penetrates inside, causing thermostat to give a signal to start the engine. You can check the tightness using a regular sheet of paper: clamp it with the door and try to pull it out. If the sheet is removed without resistance, the seal requires replacement or adjustment.
Another factor is incorrect temperature setting. Many users, wanting to cool food faster or stocking up for future use, set the regulator to maximum. This makes compressor work to the limit. It is also worth checking whether the chamber is overloaded: if food is placed close to the back wall or blocks the ventilation holes, air circulation is disrupted and sensors record an increase in temperature.
Checking and replacing the thermostat
Thermostat (or thermostat) is the “brain” of the cooling system, which controls the temperature inside the chambers. It is he who gives the command to start and stop the engine. If this element fails, it can transmit false signals that the refrigerator is “warm,” causing the motor to run continuously or turn on too often.
To diagnose the thermostat at home, you can carry out a visual inspection and check the contacts. Often the contacts inside the device body oxidize or the seal of the bellows tube is broken if it is located inside the chamber. In models with electronic control (No Frost with a display), the problem may lie in the temperature sensor, which transmits incorrect data to the control board.
- 🔍 Visual inspection: Remove the thermostat casing and check the integrity of the wires and the absence of carbon deposits on the contacts.
- 🌡️ Temperature test: Try to gently warm up the thermostat housing (with a hair dryer or warm hand). If the shutdown click does not occur when heating, the element is faulty.
- 🔌 Dialing: Use a multimeter in continuity mode. At temperatures below zero, the contacts should be closed, and when heated, they should open.
Replacing the thermostat is a procedure that can be done with your own hands, but requires care. The new element must have exactly the same markings as the old one. It is important to correctly install capillary tube (if it exists) into the seat so that it fits tightly to the evaporator. Incorrect installation will lead to incorrect temperature readings.
Diagnostics of the start relay and compressor
If the refrigerator hums, tries to start, but after a few seconds there is a click and the motor stops, the problem is most likely hidden in starting relay or the compressor itself. The relay is responsible for supplying voltage to the starting winding of the engine at the moment of start. Over time, the plastic ages, the contacts burn out, and the device ceases to perform its function.
It is not difficult to remove and check the relay. It is usually located on the side of the compressor in a black or gray plastic housing. Shake the part near your ear: if you hear a ringing inside, it means the mechanism is damaged and requires replacement. This is a consumable item that is inexpensive and can be changed in a few minutes.
A more serious situation is a malfunction of itself compressor. If the motor windings are “broken” to the housing or to each other, the starting relay will constantly try to start the motor, but the protection will turn it off. You can check this with a multimeter by measuring the resistance between the contacts and the housing. Infinite resistance or, conversely, a short circuit will indicate the need to replace the compressor, which is a complex and expensive repair.
| Symptom | Probable cause | Necessary actions |
|---|---|---|
| Humming, clicking, silence | Faulty start relay | Replacing the relay |
| Works without stopping | Freon leak or thermostat | Searching for leaks, replacing the thermostat |
| Extreme heating of the motor housing | Wear of the compressor | Replacing the compressor |
| Frequent starts during the day | Heating from the sun or stove | Repositioning the refrigerator |
☑️ Checking the start relay
The influence of refrigerant leakage on operation motor
One of the most insidious reasons that forces refrigerator to work without rest is a refrigerant (freon) leak. When the amount of gas in the system decreases, the cooling efficiency decreases. The compressor works, but cannot reach the required pressure and temperature, so the thermostat does not give the command to stop.
Signs of a leak often appear gradually. First, the refrigerator takes longer to get cold after loading with food. Then the intervals between switching on are reduced. In advanced cases compressor it buzzes around the clock, and the temperature in the cells is still above normal. In refrigerators No Frost the defrosting system may stop working, and the back wall will become covered with a “coat” of ice.
It is difficult to find the leak on your own, since freon is odorless and colorless. Microcracks often form in the foamed parts of the body or in places where tubes are soldered. To detect it, technicians use leak detectors or the method of painting the system. If a violation of the tightness of the circuit is confirmed, a specialist must be called to evacuate the system, replace the filter-drier and refill with new refrigerant.
⚠️ Attention: It is strictly prohibited to try to open the pipeline system yourself or add freon “by eye”. This can lead to an explosion of the compressor or the final failure of the system.
Problems with thermal insulation and external factors
Sometimes the reason for frequent startup lies not in the internal components, but in the operating conditions. Thermal insulation of the refrigerator Only works effectively when the unit is installed correctly. If the refrigerator is located close to the wall, in a niche or next to heat sources (radiator, oven, direct sunlight), the heat transfer of the condenser is disrupted.
The condenser (black grille at the back) should be freely washed by air. If it is clogged with dust or pet hair, cooling efficiency decreases, the motor overheats and is forced to turn on more often. Regular cleaning of the back wall with a vacuum cleaner is a simple preventative measure that extends the life of the equipment.
It is also worth paying attention to the volume of loaded products. An empty refrigerator and a completely full one require different amounts of energy to cool. However, if you loaded a lot of warm products at once, compressor it will work in enhanced mode for several hours until the temperature evens out. This is normal operation, not a breakdown.
How does the installation level affect the operation of the refrigerator?
If the refrigerator is not level, the door may not fully adhere to the body due to misalignment. Even a gap of 1-2 mm will lead to a constant flow of warm air and frequent engine starts. Use a building level to check and adjust the legs.
Electronic control and control module
In modern models of refrigerators (for example, LG, Samsung, Bosch), an electronic one is responsible for the operation of all systems. control module. If the mechanical parts are good, the thermostat is new, and the freon is in place, the problem may be in the “brains” of the device. The control board may receive distorted signals from sensors or itself issue erroneous startup commands.
A frequent problem is oxidation of the contacts in the board connectors or failure of the processor itself due to voltage surges. In such cases, the refrigerator may behave chaotically: turn on for a few seconds, take long pauses, or hum continuously. Diagnostics of the electronic module requires special equipment and knowledge.
Sometimes a simple system reboot helps. To do this, you need to unplug the refrigerator for 10–15 minutes. If after switching on the operating mode returns to normal, a software failure may have occurred. If the problem recurs, professional diagnostics or board replacement will be required.
When you need to call a technician
Despite the possibility of self-diagnosis, there are situations when you can’t do without a qualified specialist. If you have checked all available nodes, but refrigerator continues to work incorrectly, further experiments may be dangerous. A professional technician has the tools to measure pressure in the system and accurately diagnose electronics.
It is especially important to contact service if you hear strange sounds: gurgling, whistling or metallic clanging. This may indicate oil has entered the circuit or the compressor valves are damaged. Help is also needed if oily stains are detected under the refrigerator - this is a sign of serious depressurization.
Remember that timely repairs are cheaper than buying a new unit. Regular maintenance, cleaning and proper operation are the key to long and quiet operation of your equipment.
Why does the refrigerator turn on immediately after being turned off?
This may indicate sticking contacts of the thermostat or start relay. It is also possible that the temperature in the chamber did not have time to drop to the required value due to a freon leak or poor door seal, and the sensor immediately sends a signal to start again.
Can frequent switching on be related to the mains voltage?
Yes, low or unstable voltage in the mains can lead to the compressor not being able to starts the first time or works with overload. In such cases, it is recommended to use a voltage stabilizer.
How often should the refrigerator normally turn on?
In normal operation, the compressor operating ratio is about 30-40%. This means that out of an hour he works for 20-25 minutes, and rests the rest of the time. At high ambient temperatures (hot summer), the operating time can increase to 50-60%.
What to do if the refrigerator clicks loudly when starting?
A loud click is usually produced by the starting relay or the compressor itself when trying to start. If the click repeats cyclically and the engine does not start, the relay or compressor is faulty. If there is only one click and the refrigerator is working, this is the normal operation of the relay.