The situation when a refrigerator Sharp works without interruption is familiar to many owners of this equipment. You notice that the compressor hums for hours without going into standby mode, and the inside of the chamber may be too cold or, conversely, not cool enough. This is not just unnecessary electricity consumption, but also an alarming signal that the cooling system is not functioning properly.
Unlike older models with linear compressors, modern units Sharp are often equipped with inverter motors that can operate at low speeds for a long time. However, if the motor operates at full power for days, ignoring the set temperature limits, this indicates a specific malfunction. Continuous operation is a symptom that cannot be ignored.
Before calling a technician, it is worth carrying out an initial diagnosis. Often the reason lies not in the breakdown of expensive components, but in trivial things that you can fix yourself in a few minutes. In this article, we will analyze in detail the mechanics of the process and help you understand why your unit behaves strangely.
The influence of external factors and operating conditions
Before disassembling the unit, it is necessary to eliminate the influence of the environment. If the refrigerator Sharp is installed next to the battery, in direct sunlight or in a niche where air circulation is impaired, heat removal from the condenser is difficult. The compressor is forced to work harder to compensate for external heating. Temperature conditions in the room plays a critical role.
Another common reason is a loose door fit. If you have not checked the condition of the sealing rubber in a long time, warm air may constantly penetrate into the chamber. Sensors detect an increase in temperature and give a command to cool, creating a closed cycle. Check if anything is preventing the door from closing tightly.
⚠️ Attention: Do not install the refrigerator close to the wall. The gap between the rear grille and the wall should be at least 10 cm for normal air convection.
It is also worth paying attention to what exactly you are storing inside. If you have just loaded a large amount of warm food into the chamber, the compressor will work in increased mode until it reaches the set parameters. This is a normal situation, but it should not last more than 24 hours.
To quickly check the tightness, you can use a simple test with a sheet of paper. Clamp the sheet between the door and the body in different places. If the paper falls out easily or moves without resistance, then the seal in this place is worn out and requires replacement or adjustment.
Malfunctions of the thermostat and control system
One of the most common reasons for continuous operation is the failure of the thermostat. This unit is responsible for closing and opening the compressor power circuit depending on the temperature in the chamber. If the contacts are “stuck” in the “on” position, the refrigerator will freeze indefinitely until you forcibly disconnect it from the network.
In models with electronic control, the main control module is responsible for this process. If the sensor transmits incorrect data (for example, it shows that it is +10°C in the chamber, although it is already -5°C), the “brain” of the refrigerator will keep the compressor on. In models thermal sensor and the main control module. If the sensor transmits incorrect data (for example, it shows that it is +10°C in the chamber, although it is already -5°C), the “brain” of the refrigerator will keep the compressor on. In models Sharp with a system No Frost sensors are often located in the air ducts.
Diagnostics of a mechanical thermostat is possible at home. To do this, you need to remove it, lower it into a container of water at room temperature and “ring” the contacts with a multimeter. When heating or cooling (depending on the type), a click should be heard and the device readings will change.
- 🔧 Symptoms of failure: the compressor does not turn off even with the minimum setting of the regulator, there are no clicks when turning the knob.
- ❄️ Electronic errors: error codes may light up on the display indicating open circuit of the temperature sensor.
- 🔌 Wiring problems: oxidation of contacts in the thermostat connectors can lead to false readings.
If you find that the thermostat is faulty, it must be replaced with a similar one. It is important to choose a model with identical parameters, since the correct operation of the entire cooling system depends on this.
Is it possible to temporarily operate a refrigerator with a faulty thermostat?
Operation is possible only with manual control. You will have to independently turn on and off the refrigerator from the outlet using a timer or monitoring to avoid food defrosting or icing of the evaporator. However, this is a temporary measure, since the compressor may burn out from overheating.
Problems with the refrigerant and compressor
If the control system is working properly and the seal is intact, the problem may lie in a refrigerant (freon) leak. This seems counterintuitive: why doesn't the compressor turn off when there is a leak? The answer is simple: due to a lack of gas in the system, the pressure drops and the temperature in the chamber does not reach the set value. The sensor “thinks” that there is not enough cold and keeps the engine on.
Another serious reason is malfunction of the compressor itself. Wear of the piston group or valves leads to reduced performance. The motor hums, tries to create pressure, but cannot cope with the amount of work. In such cases, the unit is often hot to the touch, but there is no cooling or it is very weak.
| Symptom | Probable cause | Nature of motor operation |
|---|---|---|
| The refrigerator is warm, the motor is hot | Freon leakage | Works without stopping, quiet hum |
| Loud noise, knocking | Wear of the compressor | Works intermittently, buzzing |
| Frost only at the evaporator | Clogged capillary tube | Works cyclically, but for a long time |
| The compressor turns off after a minute | Starting relay | Click and silence |
When there is a freon leak, you can often notice oily spots on the floor under the refrigerator or in the compressor area. It is impossible to fix this malfunction on your own; you need to call a specialist with equipment for vacuuming and refilling.
⚠️ Attention: Freon is a gas that requires special conditions for disposal and refilling. Do not try to pierce the tubes yourself or add gas from cans for car air conditioners - this will lead to permanent breakdown of the compressor Sharp.
Failure of the defrosting mode in the No Frost system
In refrigerators Sharp with the system No Frost continuous operation of the compressor may be caused by a malfunction in the defrost cycle. If the evaporator heating element is burnt out, or the defrost timer is stuck in the “cooling” mode, a “coat” of ice builds up on the evaporator. The air stops circulating, the sensor does not see the cold, and the motor runs non-stop.
You can diagnose this problem visually. Defrost the refrigerator completely (leaving the doors open for 24 hours). If after switching on it worked normally, but after a week or two the situation repeated itself, the problem is in the defrosting system. It is necessary to check the heating element, thermal fuse and timer.
Often owners confuse the normal operation of an inverter compressor with a breakdown. Such models may not turn off at all, but only reduce the speed to a minimum to maintain the temperature. This is not a malfunction if the food inside does not freeze or spoil.
☑️ Diagnostics of the No Frost system
It is also important to check the fan that drives cold air. If its impeller is frozen or the engine is burned out, the cold does not enter the chamber. The compressor continues to work, trying to cool the evaporator, which is already icy.
Diagnostics and checking the electrical circuit
If you decide to carry out diagnostics yourself, start by checking the voltage in the network. Low voltage can cause the start relay to not operate correctly, or the engine to overload and not reach the required speed. Use a multimeter to measure the parameters.
Checking the start relay is the next step. This small element on the compressor housing is responsible for starting the engine. If it is faulty, the compressor may hum but not start, or, conversely, may not turn off due to stuck contacts. In models Sharp relays of the RTK type or their modern analogues are often found.
To check the relay you need to:
- Disconnect the refrigerator from the network.
- Remove the back panel and compressor casing.
- Carefully remove the relay from the compressor contacts.
- Shake the relay: if you hear a ringing sound, it means the contacts are damaged.
- Ring the contacts with a tester.
Replacing the relay is a simple procedure that does not require a special tool. The main thing is to purchase a part with exactly the same markings. An incorrectly selected relay can lead to burnout of the motor windings.
When you need to call a specialist
There are a number of situations when self-repair is not only impractical, but also dangerous. If you have checked all external factors, the thermostat and the relay, but the refrigerator Sharp continues to work without interruption, most likely the problem is deeper. Professional diagnostics using a pressure manifold are required.
The technician will be able to accurately determine the pressure in the system, check the tightness of the circuit and assess the condition of the compressor. In the event of a freon leak, you will need to search for the location of the damage, solder and evacuate the system. These are complex manipulations that require a license and equipment.
Professional help is also needed if the problem lies in the electronic control module. Reflashing or replacing the control board requires special knowledge and original spare parts. Trying to repair it yourself can lead to failure of all electronics of the refrigerator.
⚠️ Attention: If your refrigerator is under warranty, any independent opening of the seals and repairs will lead to loss of warranty obligations. In this case, immediately contact an authorized service center.
Remember that timely contact with specialists can save an expensive compressor from combustion. Long-term operation in emergency mode wears out the engine resource many times faster.
Questions and answers (FAQ)
Why does the new Sharp refrigerator work constantly on the first day?
This is normal. After turning on for the first time, the unit needs time to cool the entire internal volume and products to the set temperature. During this period, the compressor can work without interruption for up to 24 hours.
Is it possible to adjust the temperature if the refrigerator does not turn off?
Yes, try changing the thermostat settings. If, when setting the minimum value (+5...+7°C), the compressor continues to operate without pauses, this indicates a malfunction of the system, and not the need for cooling.
Is it dangerous to leave a running refrigerator turned on overnight?
If the reason is a freon leak or a malfunction of the thermostat, prolonged operation can lead to overheating of the compressor and its jamming. It is better to turn off the device before the technician arrives.
How often should a Sharp refrigerator turn off?
Under normal conditions, the operating cycle is approximately 15-20 minutes of operation and 20-40 minutes of rest. Inverter models can work longer, but with less power, practically without shutting down, which is their normal mode.