The situation when a household refrigerator Indesit continues to work without interruption immediately after the defrosting procedure is a common problem faced by many owners of this equipment. Users often mistakenly believe that the device simply takes longer to reach temperature, but the continuous hum of the compressor for several hours is an alarming sign. In normal mode, the unit should turn on and off cyclically, maintaining the set temperature conditions inside the chambers.
The main reason for this behavior lies in malfunctions of the thermoregulation system or a refrigerant leak, which could appear precisely after temperature stress. A sharp temperature change during defrosting could cause a malfunction of electronic components or mechanical sticking of contacts. Ignoring this problem can lead to a significant increase in energy consumption and, ultimately, to failure of the compressor itself due to overheating.
In this article we will analyze in detail the technical aspects of the operation of brand refrigeration equipment Indesit and identify the key components responsible for stopping the engine. Understanding the operating principles of the thermostat and sensors will help you diagnose the problem yourself or decide to call a repairman. It is important to act quickly, since long-term operation without stopping wears out the motor life of the unit.
The principle of operation of the thermostat and its role in the cooling cycle
The central element responsible for the frequency of turning the motor on and off in classic models Indesitis a mechanical thermostat. This device is a switch that opens the electrical circuit when a certain temperature is reached in the chamber. If the refrigerator does not turn off after defrosting, the first suspicion falls on this unit, since it directly controls the operation of the compressor.
Inside the thermostat there is a bellows tube filled with gas or liquid, which responds to temperature changes. When the inside of the refrigerator compartment becomes cold enough, the substance in the tube contracts and the contacts open. If this mechanism is stuck in the “on” position, the compressor will work continuously, trying to cool the chamber to unattainable values.
⚠️ Attention: Attempting to replace the thermostat yourself requires skills in working with electrical circuits. Before starting any work, be sure to disconnect the device from the power supply to avoid electric shock.
Often after defrosting, moisture can enter the capillary tube of the thermostat, which, when frozen, blocks the moving parts of the mechanism. As a result, the sensor “does not feel” that the temperature has already dropped to the required minimum.
How to check the thermostat without instruments?
Freeze the thermostat in the freezer (having previously disconnected it) for 30-40 minutes. If after removal and warming there is no click, and the contacts ring, the part is faulty.
Faults of temperature sensors in No Frost systems
In more modern models Indesitequipped with the system No Frost or Total No Frost, the role of a mechanical regulator is performed by electronic sensors (thermistors). These components transmit data to the control module, which in turn decides to stop the compressor. If the refrigerator does not turn off after defrosting, there is a high probability of failure of one of the evaporator or air flow sensors.
The defrosting process could lead to oxidation of the sensor contacts or damage to its integrity due to the mechanical action of ice. The electronics continue to receive a signal that the temperature in the chamber is higher than normal, and forcibly keeps the compressor on.
Diagnostics of electronic sensors requires using a multimeter to measure resistance at different temperatures. Resistance values must correspond to the technical characteristics of a particular model Indesit.
The following is a table with approximate resistance values for popular thermistors used in refrigerators:
| Sensor type | Temperature (°C) | Resistance (kOhm) | Location |
|---|---|---|---|
| Evaporator sensor | -10 | 20-22 | On the evaporator |
| Evaporator sensor | +20 | 6-7 | On the evaporator |
| Defrost sensor | 0 | 15-16 | In the heating element area |
| Chamber sensor | +5 | 20-22 | On the back wall |
The influence of freon leakage on the compressor operating mode
One of the most serious The reason why the refrigerator Indesit does not turn off after defrosting is a banal refrigerant leak. During defrosting, the user often works vigorously with a knife or other objects to try to speed up the defrosting of the ice, and may accidentally damage the aluminum evaporator or heating circuit. Even a microscopic puncture leads to the release of freon.
If there is insufficient amount of refrigerant in the system, the pressure drops and the temperature in the chamber does not drop to the specified level. The thermostat or electronic module “sees” that the target temperature has not been reached and does not give the command to turn off the motor. The compressor works for wear and tear, trying to compensate for the loss of cooling capacity.
Indirect signs of freon leakage are:
- 🌡️ Weak cooling of products or complete absence of cold despite the operation of the motor.
- 🔊 The compressor works almost without interruption, strongly heats up.
- ❄️ Partial freezing of the evaporator (only at the exit point of the tube) or its complete absence of frost.
- 💨 A whistling sound at the site of damage to the tube (rarely, with a large leak).
If you suspect a leak, you cannot continue operating the refrigerator. Operating a compressor without adequate cooling with oil and freon will lead to its combustion in a short time.
Problems with the door seal and thermal insulation
After defrosting, especially if it was carried out with using hot water, the rubber door seal could be damaged. Hot water washes away the grease film and can deform the rubber, causing the door to no longer fit tightly to the body. Warm air constantly enters the chamber, and the refrigerator is forced to work in increased mode to compensate for the heat influx.
You can check the tightness using a simple test with a sheet of paper. Clamp the sheet between the door and the body around the perimeter. If the paper is removed without resistance or falls out easily, it means that the seal is broken in this place.
It is also worth checking whether the refrigerator has moved after defrosting. If the unit is not level, the door may not close on its own under the influence of gravity.
To fix the problem you need to:
- 🧼 Thoroughly wash and degrease the seal with warm soapy water.
- 🔥 Gently warm the deformed areas with a hairdryer (without overheating!) and straighten them.
- 🔧 Adjust the legs of the refrigerator for the correct tilt back.
Failure of the electronic control module
In refrigerators Indesit with electronic control, the control module is responsible for all processes. A voltage surge during connection after defrosting or moisture getting on the contacts could trigger a software failure or failure of the triac that controls the compressor. In this case, the “brain” of the refrigerator simply does not send a signal to turn off.
Often the control module fails due to oxidation of the contacts if defrosting was carried out in a hurry and moisture got inside the case.
⚠️ Attention: Diagnostics of the control module requires professional equipment. It is not always possible to visually identify a burnt track or microcircuit.
Sometimes rebooting the system helps. To do this, you need to unplug the refrigerator for 15-20 minutes and then turn it on again. If the problem is software in nature, this can reset the error.
Algorithm of actions when a malfunction is detected
If you are faced with the fact that your Indesit does not turn off, do not panic, but you should not hesitate either. A clear action plan will help minimize damage and properly prepare for repairs. First, make sure that the refrigerator is installed correctly and the doors are closed tightly.
Then perform initial diagnostics: listen to how the motor works, check the temperature in the chambers and inspect the seal. If there is no visual damage, try rebooting.
The following is a checklist of priority actions:
☑️ Primary diagnostics
If simple methods do not help, you need to call a technician to carry out in-depth diagnostics using a pressure manifold and tester.
Frequently asked questions (FAQ)
How long should the refrigerator operate after defrosting before the first shutdown?
Normally, the refrigerator Indesit should reach the temperature and turn off after 1.5–2 hours of work. If the motor hums for more than 3-4 hours without a break, this is a sign of a malfunction.
Is it possible to continue using the refrigerator if it does not turn off?
For a short time, it is possible, but this is dangerous for the compressor. Long-term operation without stopping will lead to overheating of the motor windings and eventual combustion, which is much more expensive to repair.
Why does the refrigerator become less cold after defrosting, but it does not turn off?
This is a classic sign of a freon leak. The compressor runs constantly, but there is not enough refrigerant in the system to create the required temperature, so the cycle does not complete.
Can replacing the thermostat solve the problem of not turning off?
Yes, if the reason lies in sticking thermostat contacts. In mechanical models, this is the most common reason for the motor running endlessly.