Many owners of modern equipment are faced with a situation where cold air stops circulating in the chamber, although the compressor continues to work. Often the cause is the failure of the heating element in the defrost system. If you are looking for information on how to connect 133 to the refrigerator, then you are faced with the task of replacing the heating element in the evaporator. This part is responsible for melting the ice, and without it, the evaporator turns into an ice monolith that blocks the air flow.
The replacement process requires care and basic knowledge of electrical engineering, since the work is carried out with high voltage. Heating element 133 is a common heater size, often used in Samsung, LG and Indesit models. Incorrect installation or failure to follow safety instructions may result in a short circuit or damage to the plastic parts of the housing. In this article we will analyze all stages of the work: from diagnostics to final testing of the unit.
Diagnostics of defrost heater malfunction
Before you start disassembling the unit and searching for spare parts, you need to make sure that the problem lies in the heating element. Symptoms may be similar to a faulty defrost timer or thermostat. The main sign of heating element failure is freezing of the back wall of the freezer when the fan is running. If you notice that food is starting to deteriorate due to insufficient cooling, it is worth conducting an initial check.
For accurate diagnosis, you will need a multimeter. You need to get to the heater itself, which often requires partial disassembly of the freezer compartment. Measuring the resistance allows you to understand whether the nichrome thread inside the tube is intact. If the device shows a break (infinity), then the element must be replaced.
It is also worth checking the integrity of the supply wires and contacts. Often oxidation or breakage occurs not in the heating element itself, but at the junction with the terminals. A visual inspection may reveal traces of soot or melted insulation.
Necessary tools and safety measures
Working with electrical appliances requires strict adherence to electrical safety rules. Any manipulations inside the refrigerator body can only be carried out after completely disconnecting the device from the power supply. Voltage 220 Volts This is life-threatening, so do not neglect this rule even during short-term work.
To perform the replacement, you will need a standard home repair kit. Having a specialized tool will simplify the task and minimize the risk of damaging the fragile plastic latches. Prepare your work area in advance so that everything you need is at hand.
- 🔧 Screwdrivers (Phillips and flathead) for removing panels.
- 🔌 Multimeter for checking the circuit and resistance.
- 🧤 Dielectric gloves to protect your hands.
- ✂️ Pliers or side cutters for working with wires.
- 🔥 Construction hair dryer (optional) for defrosting ice.
⚠️ Attention: Never try to chip off ice with a knife or sharp objects. This can lead to breakdown of the evaporator and release of freon, after which repairs will become economically unfeasible.
Removing the old part and preparing the place
To gain access to the heating element, you need to remove the back panel in the freezer. In most models, it is secured with screws or plastic latches. Proceed with caution, as plastic becomes brittle in the cold and breaks easily. If the panel is frozen, let the refrigerator stand defrosted or carefully use a hairdryer on the minimum temperature.
After removing the panel, access to the evaporator will open. The heating element is usually located at the bottom of the coil or surrounds it. Attaching the heating element can be done using metal brackets, screws, or simply by tightly fitting into special grooves. Remember or take a photo of the wiring diagram before disconnecting them.
If there is ice left on the evaporator, it must be completely removed. The presence of moisture may cause a short circuit immediately after switching on. Make sure the installation area is dry and clean. The old heater is removed carefully so as not to damage the aluminum plates of the evaporator.
How to safely defrost the evaporator?
Use a regular hair dryer, setting it to warm (not hot!) mode. Direct the air flow towards the ice formations, keeping the hairdryer at a distance of at least 15-20 cm. Do not allow water to come into contact with electrical contacts and wiring. The process can take from 10 to 20 minutes depending on the thickness of the ice.
Connection diagram for heating element 133
Connecting the new heater is done in the reverse order. The main difference may be the length of the wires or the type of terminals. If the wires of the new heating element are shorter, they may need to be extended using heat-resistant insulation. The standard connection is made to the terminal block or directly through twisting followed by insulation.
It is important to observe polarity, although it is not critical for the active resistance of the heating element. However, correct connection ensures reliable contact. Make sure that the wires do not touch the metal parts of the housing or the heater itself to avoid breakdown on the housing.
Below is a table of typical parameters for checking the compatibility of elements:
| Parameter | Value / Description | Tolerable deviation |
|---|---|---|
| Power | 350 - 450 W | +/- 10% |
| Resistance | 120 - 160 Ohm | Depends on power |
| Voltage | 220 V | Network standard |
| Tube length | Individual | Must match |
⚠️ Attention: Specifications may vary depending on the specific refrigerator model. Always check the markings on the factory heating element with the parameters of the new spare part before installation.
☑️ Check before installation
Checking functionality after installation
After the new element is installed and the wires are connected, do not rush to put all the panels back together. It is better to perform the initial start-up with open access to the node in order to visually control the process. Plug in the refrigerator and start the defrost cycle (if there is such a function in diagnostic mode) or simply wait until the automation starts heating.
Within a few minutes the heating element should begin to heat up. This can be checked by carefully placing your hand (without touching!) to the surface of the tube. You should also monitor the absence of sparking at the joints. If you hear a cracking sound or see sparks, turn off the device immediately.
After making sure that it is working properly, you can begin assembly. Install the back panel and secure all screws. It is important that the wiring is not pinched by the panels. Once fully assembled, allow the refrigerator to idle for 2-3 hours to stabilize the temperature.
Typical mistakes when replacing a heater
One of the most common mistakes is ignoring the check of adjacent elements of the system. Often, together with the heating element, defrost thermostat or the fuse fails. If you replace only the heater, the system may start working, but soon turn off again due to protection.
Another error is poor contact insulation. In conditions of high humidity and temperature changes, even a microscopic gap can lead to corrosion and oxidation. Use only high-quality materials designed to work in aggressive environments.
Some craftsmen try to bend the heating element so that it fits. This is strictly forbidden. the nichrome thread inside is fragile, and deformation of the tube will lead to rapid burnout of the element or its destruction. The dimensions must match initially.
Frequently asked questions (FAQ)
Is it possible to use a higher power heating element if the original is not on sale?
The use of an element with a power significantly exceeding the factory one is not recommended. This can lead to overheating of the plastic parts of the evaporator and melting of the housing. A small deviation within 10-15% is acceptable, but it is better to look for an exact analogue.
Why does the refrigerator not turn on after replacing the heating element?
Perhaps the power cord was damaged during installation or the automatic fuse in the panel tripped due to a short circuit. Also check whether the fuse in the defrost circuit of the refrigerator itself has blown.
How often do you need to change the heating element 133?
The service life of the heating element is usually 5-10 years, depending on the intensity of use and water quality (scale). Planned replacement is not required, they are replaced only in the event of a malfunction.
Is it necessary to call a technician for this procedure?
If you have the skills to work with power tools and understand the principles of operation of electrical circuits, replacement is possible yourself. Otherwise, it is better to entrust the work to a professional so as not to violate the warranty (if it is still valid) and not to damage the cooling system.
What to do if the new heating element does not fit in length?
If the heater is longer, it cannot be shortened. In short, you can carefully straighten the coil or use extension wires (observing the cross-section), but this is less reliable. The ideal option is to look for a model with exact geometric dimensions.