A sudden stop of the compressor or a complete lack of response of the refrigerator Ariston to being connected to the network often confuses the owner. The first thing many people do is check the socket and power cord, forgetting about the internal protective element, which could burn out due to a power surge. It fuse is the first line of defense of complex electronics and motors from overloads. If it fails, the equipment simply will not receive power, and no settings will help start the cooling cycle.
In this article we will look in detail where exactly to look for this small but critical component in various models of the Italian brand. You will learn how to correctly diagnose its condition using a multimeter and whether it is worth trying to restore its functionality yourself. It is important to understand that in different series of refrigerators Ariston the design and arrangement of protective elements may differ significantly.
Some models are equipped with fusible inserts in the plug, others have thermal relays inside the case, and in modern versions their function is taken over by electronic modules. We'll look at all of these options so you can pinpoint the cause of your appliance's problem. Correct identification of the problem will save you time and money, allowing you to avoid calling a technician to simply replace a part.
Main types of protective elements in Ariston technology
Before you begin disassembling the unit, you need to understand what type of protection we are dealing with. In refrigeration equipment Ariston most often there are two main types of fuses: fuses in the power cord and thermal fuses integrated into the defrost or compressor protection system. Fuse fuse usually located directly in the plug or at the point where the cable enters the housing, reacting to sudden surges in current in the network.
The second type is thermal fusewhich trips when the permissible temperature is exceeded. It is often installed near the defrost heater or on the compressor casing. Its purpose is to prevent fire or insulation melting in the event of a thermostat malfunction or a stuck relay. In modern models with the system No Frost this element plays a key role in the safety of the evaporator.
⚠️ Attention: Never replace a blown fuse with an element with a higher rated current. This can lead to a wiring fire or failure of an expensive compressor.
It is also worth mentioning the existence of protective devices in the starting relays. Although technically this is not always a classic fuse, the overload protection function is implemented through a bimetallic plate or a posistor. If this particular unit burns out, the engine hums, but does not start, or is completely silent. Diagnostics of such systems requires deeper intervention in the electrical circuit.
Location of the fuse in the plug and input group
The most accessible place where the protection can be located is the power cord plug. Some refrigerator models, especially those produced for certain markets, use a molded plug with a built-in fusible element. If your refrigerator stops working immediately after a power surge, inspect the plug: sometimes it has an indicator or reset button, but most often it requires disassembly. Ariston, especially those released for certain markets, use a molded plug with a built-in fusible element. If your refrigerator stops working immediately after a power surge, inspect the plug: it sometimes has an indicator light or reset button, but most often requires disassembly.
If the plug is collapsible, unscrew the central screw and carefully separate the halves of the case. Inside you will see two contacts and, possibly, a small glass or ceramic insert. Blown fuse easily determined visually: the thread inside will be broken, and the glass may turn black. In non-separable plugs, you will have to carefully cut off the insulation at the base to get to the insides, but it is better to replace the entire cord immediately.
The second place to look is the input group of wires directly at the back wall of the refrigerator. The power cable can go into a special plastic box, where the grounding contacts are soldered and an additional surge protector with protection is installed. Open the back cover (if there is one) or reach the cable entry point. Here they often install circuit breakers or fusible inserts in a plastic case.
How to safely disassemble the plug?
Before any manipulations with the plug, make sure that it is disconnected from the network. If the plug is molded and you decide to open it, use a thin blade to avoid damaging the internal wires. After replacing the element, carefully insulate the joint with heat shrink.
When you find a burnt element in the input group, it is important not only to replace it, but also to understand the reason. If the mains fuse has blown, it means there was a powerful surge or short circuit inside the device. A simple replacement can lead to re-burnout a few seconds after switching on.
Finding a thermal fuse in a No Frost system
In refrigerators Ariston with a system No Frost the thermal fuse is a critical element of the defrost circuit. It is located in the freezer compartment, usually hidden behind the back panel. Its main function is to break the defrost heater circuit if the temperature in the evaporator reaches critical values (usually about 70-80 degrees Celsius), which indicates a malfunction of the defrost thermostat.
To access this element, you will need to completely defrost the chamber, remove all shelves and dismantle the rear plastic panel. Thermal fuse is a small cylinder with two wires, often pressed against the evaporator or hanging next to the heating element. It can be enclosed in a heat-shrinkable tube or plastic tip.
- 🔍 Visually inspect the wires: often the break occurs not in the body of the fuse itself, but in the place where the wires are soldered or twisted.
- 🌡️ Check nearby elements: if the thermal fuse has burned out, there is a high probability that the defrost sensor is also faulty or the relay is stuck.
- 🧊 Pay attention to ice: excessive ice buildup (excessive ice) on the evaporator is a direct sign of problems in the defrost circuit, where our hero is located.
Replacing this element requires care, as the wires often become damaged fragile in the cold. Use quality solder and heat shrink to insulate connections. Do not twist the wires just like that - in conditions of high humidity and low temperatures this will lead to oxidation and re-breakage.
☑️ Diagnosis of the defrost circuit
Diagnostics of the start relay and compressor protection
If the refrigerator is silent, but there is voltage in the network and the plug is intact, the problem may be hidden in the compressor start relay. On older models Ariston starting capacitors and protective tablets were used here, which served as an overload fuse. On modern units, this role is played by posistor or an electronic control board.
The starting relay is located in a black plastic or metal casing on the back of the compressor, at the bottom of the refrigerator. After removing the cover, you will see a block with contacts. Inside there may be a fuse link built into the relay circuit. If it burns out, the compressor will not receive an impulse to start. Often, along with the fuse, the motor winding also fails, so checking the resistance of the windings is mandatory.
⚠️ Attention: The compressor is under high pressure. Never attempt to solder pipes or open the compressor housing yourself. The repair concerns only the electrical part.
In models with an inverter compressor, there are no classic fuses in the relay - there is an electronic unit there. If it burns out, this can be visually determined by swollen capacitors or blackened tracks on the board. Repairing such units requires special knowledge and equipment; it is often easier to replace the entire unit.
Tools and testing methods with a multimeter
For accurate diagnostics, you will definitely need a multimeter. A visual inspection does not always give a 100% guarantee, especially if the fuse thread is thin and the break is not visible to the eye. Switch the device to the continuity mode (usually indicated by a speaker symbol) or resistance measurement (Ohm).
Touch both ends of the fuse with the probes. If the device beeps or shows resistance close to zero, the element is working. If the unit (infinity) lights up on the screen or there is no sound - circuit broken, and the fuse requires replacement. Carry out the same procedure with the thermal relay: at room temperature it should ring.
| Element type | Normal resistance | Failure sign | Action |
|---|---|---|---|
| Mains fuse | 0 - 1 Ohm | Infinity (1) | Replacement |
| Thermal fuse | 0 - 1 Ohm | Infinity (1) | Replacement + checking the heating element |
| Thermostat | 0 Ohm (closed) | Infinity in cold | Replacement or adjustment |
| Posistor | 10-50 Ohm (cold) | Short circuit or break | Replacing the relay set |
It is important to carry out measurements only on a de-energized device. Even if you remove the plug from the socket, the capacitors in the control unit can retain their charge for several minutes. Let the equipment stand for 5-10 minutes before starting measurements.
Replacement process and selection of analogues
After the faulty element found, a replacement needs to be found. There is always a marking on the fuse body. Main parameters: rated current (for example, 10A), voltage (250V) and temperature threshold for thermal (for example, 72°C). Replace the fuse possible only for similar characteristics. The use of “bugs” or twists is strictly prohibited.
To replace the mains fuse in the plug, simply strip the ends of the wires and solder them to a new element or insert them into contact clamps, if the design allows. For a thermal fuse in the system No Frost it is important to ensure good thermal contact with the evaporator housing, if the design requires it. Sometimes new fuses are sold without wires - then the old wires are carefully cut off at the very base of the burnt element and soldered to the new one.
After assembling all the components, do not rush to close the back panels. Plug in the refrigerator and listen. If you hear the relay click and the compressor starts, you are on the right track. Let the equipment work for 15-20 minutes, check the heating of the condenser (side walls) and the appearance of cold in the chambers.
Frequent errors during self-repair
One of the most common mistakes is ignoring the wiring condition. When replacing a blown fuse, many people forget to check whether the insulation nearby has melted. If the wiring is damaged, the new element will burn out instantly or, worse, a short circuit with sparking will occur.
Another mistake is using fuses with a lower rating “just in case.” This will lead to the fact that the refrigerator will constantly turn off when starting the compressor, when the starting currents are maximum. Rating must strictly comply with the manufacturer's requirements specified in the technical documentation.
- 🚫 Do not use aluminum foil or wire as a temporary replacement - this is a direct path to fire.
- ❄️ Do not forget to defrost the chamber before removing the evaporator panel, so as not to damage the plastic fasteners and the evaporator itself.
- 🔌 Do not turn on the device with open electrical contacts - this is dangerous to life.
Also, users often confuse the fuse with the sensor temperature. The sensor changes its resistance depending on the temperature, but should not burst during normal operation. A fuse is a one-time protection element.
⚠️ Attention: Technical characteristics and location of parts may vary depending on the specific model and year of manufacture of the Ariston refrigerator. Always check the original service documentation or the diagram on the sticker inside the camera.
When you need to call a technician
Despite the apparent simplicity, there are situations when self-repair can be harmful. If, after replacing the fuse, the equipment does not work again, or the new element burns out immediately, the problem is deeper. Perhaps the compressor itself, the control unit, or there is a hidden short circuit in the wiring is faulty.
Difficulties can arise when troubleshooting electronically controlled refrigerators. Here the fuses can be soldered on the board, and replacing them requires soldering equipment and skills in working with SMD components. Inept handling of the board can lead to failure of the control processor.
If you are not confident in your abilities, do not have a multimeter or are afraid to work with electricity, it is better to contact a specialized service. A professional technician will conduct a full diagnostic, check not only the fuses, but also the tightness of the system, which is especially important if the problem is related to a freon leak, which could cause overheating.
Is it worth repairing an old refrigerator?
If the refrigerator is more than 10-12 years old, and not only the fuse has burned out, but also compressor, repair may not be economically feasible. The cost of a new compressor and work can be 70-80% of the price of new equipment.
Is it possible to temporarily short-circuit the fuse to check the operation of the refrigerator?
It is absolutely not possible. Shorting the fuse removes the protection. If there is a short circuit in the system, it will cause the wiring to burn, the plastic to melt, or even a fire. The functionality of the components is checked with a multimeter, and not at random by closing the circuit.
Why does the fuse burn out immediately after switching on?
This indicates a serious short circuit in the circuit. Possible reasons: breakdown of the compressor windings, short circuit in the defrost heating element, malfunction of the start relay or control unit. A complete diagnosis of the electrical circuit is required.
Where can I find the electrical circuit for my Ariston model?
The circuit is often pasted on the inside wall of the refrigerator (on the side or back) or on the back cover of the compressor. The circuit can also be found in the service manual by the exact model number (E-Nr), which is indicated on the nameplate inside the chamber.
What is the difference between a thermal fuse and a thermostat?
A thermostat is a regulator that constantly opens and closes a circuit to maintain temperature. A thermal fuse is an emergency element that opens the circuit once at a critical temperature and requires replacement.
How much does it cost to replace a fuse in the service?
The cost consists of the price of the element itself (usually inexpensive) and the cost of calling a technician and diagnostics. On average, work can cost from 1,500 to 3,000 rubles, depending on the complexity of access to the part and the region.