Refrigerator thermostat: how to make, replace or adjust it yourself

The thermostat is the “brain” of the refrigerator, which controls the temperature in the chambers and controls the operation of the compressor. If it fails, the equipment ceases to maintain the desired microclimate: it freezes the food, does not cool it, or works without stopping. Replacing a thermostat in a service center will cost 2–5 thousand rubles, but if you have the tools and basic skills in repairing electronics, you can do it yourself.

In this article we will look at how check the thermostat for functionalityto select a similar part, correctly dismantle the old one and install a new one, and also adjust it to the optimal parameters. We will separately dwell on the nuances of working with electronic and mechanical thermostats, as well as on typical mistakes that beginners make. If your refrigerator has stopped freezing or, on the contrary, has turned into “permafrost”, these instructions will help you save on repairs.

Signs of a thermostat malfunction: when a replacement is needed

Before taking a soldering iron or screwdriver, make sure that the problem is in thermostat. Its breakdown manifests itself clearly, but some symptoms may coincide with compressor malfunctions, freon leaks or clogged capillary tubes. Here are the key “bells”:

• 🔴 The refrigerator does not turn on —the light inside is on, but the motor does not start, although the thermostat clicks when the knob is turned.
• ❄️ Continuous operation of the compressor —the unit does not turn off, even when the desired temperature has been established in the chambers.
• 🌡️ Temperature does not match the settings —for example, when the regulator is set to “3” in the freezer +10°C, and in the main compartment -5°C.
• 🔊 Clicks without starting the motor —the thermostat tries to turn on the compressor, but the contacts do not are closed.

Important! If the refrigerator Indesit, Atlant or Samsung is older than 10 years, the thermostat could fail due to natural wear and tear. In modern models (for example LG No Frost or Beko with electronic control) temperature sensors often break down, rather than the regulator itself. Before replacing, check them with a multimeter!

To exclude other malfunctions, perform simple diagnostics:

1. Unplug the refrigerator for 10 minutes, then turn it on again. If it worked normally, the problem could be a temporary failure.
2. Listen to whether the thermostat makes clicks when you turn the knob. Their absence is a sign of mechanical failure.
3. Check for ice on the back wall (for models with a drip system). Its presence may indicate a freon leak, and not a thermostat.

Types of thermostats: how to determine the model to replace

Thermostats are divided into two main types: mechanical (with a manual regulator) and electronic (with digital control). Mechanical ones were installed in Soviet-style refrigerators (ZIL, Minsk, Birusa) and budget models of the 90s - 2000s (Atlant MHM-1708, Snaige FR-145). Electronic ones are found in equipment with a display (Samsung RL-33, LG GA-B409).

To to select a replacement, you will need:

1. Make and model of refrigerator —usually indicated on a sticker inside the chamber or on the back wall.
2. Type thermostat —mechanical (for example, K-59, TAM-133) or electronic (for example, EVM-3, RT-2).
3. Rated voltage —for household refrigerators this is usually 220–240 V.
4. Capillary tube length —for mechanical thermostats it can be from 0.8 to 2.5 meters.

Tip: If you can’t find the original part, look for analogues by parameters. For example, thermostat K-59 interchangeable with TAM-112 provided the length of the capillary tube matches. For electronic models, it is important that the connector fits the control board.

⚠️ Attention! B refrigerators No Frost the thermostat is often integrated into the control board. Replacing it may require flashing the module - without experience, it is better to contact the service.

Tools and preparation for replacing the thermostat

For work you will need:

• 🔧 Screwdrivers (phillips and flathead) - for dismantling the control panel.
• 🔌 Multimeter - to check the circuit for breaks.
• 🔥 Soldering iron (for models with soldered contacts) - power 25–40 W.
• 📏 Wire cutters/pliers - for working with a capillary tube (only for mechanical thermostats!).
• 🧲 Magnet or marker - so as not to mix up the wires when disconnecting.

Preparing the refrigerator:

1. Disconnect the equipment from the mains and defrost (if there is ice).
2. Take out all the products and shelves - they will interfere with access to the thermostat.
3. Take a photo of the wire connection diagram to the thermostat (especially if there are more than 3 of them!).
4. If the thermostat is mechanical, carefully remove the adjustment knob temperature - it is usually attached to a latch or screw.

Is the refrigerator unplugged from the outlet?|

Is there a photo of the wires being connected?|

Are the parameters of the new thermostat suitable (voltage, tube length)?|

Ready tools (screwdrivers, multimeter)?-->

Safety: Do not work under voltage! Even if the refrigerator is turned off, the capacitors in the circuit can retain a charge. Touch the contacts only after checking with a multimeter in voltage measurement mode.

Step-by-step instructions: how to replace thermostat

The replacement process is different for mechanical and electronic thermostats. Let's consider both options.

Replacing a mechanical thermostat

Mechanical thermostats (K-59, TAM-133) are usually located inside the refrigerator compartment, behind the control knob, or on the top panel (in models Atlant, Stinol).

1. Removing the old thermostat:
   • Remove the protective casing (it can be secured with latches or screws).
   • Disconnect the capillary tube from the evaporator - its end is usually attached to the refrigerant plate.
   • Mark with a marker or photograph the connection of the wires (usually there are 3-4 of them: phase, neutral, ground and wire to the compressor).
   • Unscrew the mounting screws and remove the thermostat.

Installing a new thermostat:

• Connect the wires in the same sequence (check the photo!).
• Fix the capillary tube on the evaporator - it should fit tightly to the metal plate.
• Install the thermostat in place and fix the casing.

Important! The capillary tube should not bend or touch the compressor - this will distort the temperature readings. If the tube is too long, carefully shorten it with wire cutters, but not less than 30 cm from the end (otherwise the thermostat will not work correctly).

Replacing an electronic thermostat

Electronic thermostats (EVM-3, DA97-00123A) are usually built into the control board, which is located on the top panel of the refrigerator (for example, in Samsung RL-33) or behind the back cover (in LG GA-B409).

1. Shutdown boards:
   • Remove the top cover of the refrigerator (it can be attached with clips or screws).
   • Disconnect the power and sensor connectors from the board. Remember their location!
   • Unsolder the old thermostat (if it is not on the connector) or disconnect its contacts.

Installing a new module:

• Connect the new thermostat to the board, observing the polarity (plus/minus).
• Connect the temperature sensors - they are usually marked (for example, NTC for the refrigerator compartment sensor).
• Check the circuit with a multimeter: the resistance between the thermostat contacts should be 0 Ohm in the “On” position and ∞ in the “Off” position.

What to do if the new thermostat does not does it work?

If after replacement the refrigerator does not turn on:

1. Check whether the wires are connected correctly (check the photo).

2. Make sure that the capillary tube (for mechanical models) is not damaged and fits tightly to the evaporator.

3. Measure the voltage at the thermostat contacts with a multimeter - when you turn the knob, it should appear/disappear.

4. If the thermostat is electronic, check if the fuse on the control board is blown (usually it is marked F1 or F2).

Test after replacement: Connect the refrigerator to the network and set the temperature regulator to the middle position. After 15–20 minutes, check:

• Does the compressor start?
• Does it turn off after reaching the desired temperature (in mechanical models a click should be heard).
• Is it correct? temperature in the chambers settings (use a separate thermometer).

How to adjust the thermostat without replacing

If the thermostat is working, but the refrigerator does not work correctly (for example, it freezes slightly or, on the contrary, freezes), it can be calibrateThis is true for mechanical models with a manual regulator.

Adjustment instructions:

1. Turn the thermostat knob to position “0” (off) and unplug the refrigerator.
2. Remove the knob and protective cover to gain access to the adjustment screw (it is usually located under handle gear).
3. Rotate the screw clockwiseto increase temperature in the chamber (the compressor will turn on less often), or counterclockwiseto decrease temperature (the compressor will work longer).
4. Make 1-2 turns, then turn on the refrigerator and check the temperature after 6-8 hours.

Critical information: In thermostats TAM-133 i K-59 the adjusting screw has a seal - breaking it can lead to incorrect operation. If you are not sure of your actions, it is better to replace the entire thermostat.

Problem	Action	Cause
The refrigerator does not turn off	Turn the screw clockwise (1 turn)	Thermostat switches on when the temperature is too low
Poor cooling	Turn the screw counterclockwise (1 turn)	Thermostat turns off the compressor too early
The compressor turns on rarely	Turn the screw counterclockwise (0.5 turns)	The response threshold is too high

⚠️ Attention! In electronic refrigerators (Samsung, LG), the thermostat is calibrated through the service menu. To do this, you need to press a combination of buttons (for example, Power + Freezer + Fridge simultaneously for 5 seconds). Incorrect settings can damage the equipment - without experience, it is better to call a specialist.

Typical mistakes when replacing a thermostat

Even experienced ones technicians sometimes make mistakes that lead to repeated breakdowns. Here's what you can't do:

• ❌ Ignore the test. multimeter -the new thermostat may also be defective. Before installation, check it in the "diagnosis" mode: when you rotate the knob, the contacts should close/open.
• ❌ Shorten the capillary tube unnecessarily - if it is too short, the thermostat will operate with a delay. The optimal length for most models is 1.2–1.8 m.
• ❌ Mix up the wires - if you connect the phase and zero incorrectly, the thermostat will burn out. In mechanical models, the phase usually goes to contact “3”, zero - to “4”, and the wire to the compressor - to “2”.
• ❌ Close. thermostat without test After replacement, the refrigerator should work for at least 1 hour. If the compressor does not turn off or turn on, it means something is connected incorrectly.

Example from practices: In refrigerators Indesit BIAA 13 the wires of the thermostat and the compressor start relay are often mixed up. As a result, the equipment turns on for 5 seconds and turns off. To avoid this, always check the connection diagram (it can be found according to the refrigerator model on the Internet).

Where to buy a thermostat and how much does it cost

You can get a new thermostat purchase:

• 🛒 In specialized spare parts stores (for example, "Rembytekhnika", "Spare parts for refrigerators") - here you can get a guarantee and advice.
• 🌍 On marketplaces (Wildberries, Ozon, AliExpress) - cheaper, but there is a risk of running into a fake. Pay attention to the reviews and rating of the seller.
• 🔧 In service centers —they often sell used parts from disassembly (30–50% cheaper, but without a guarantee).

Average prices for thermostats (2026):

• K-59 (for Atlant, Minsk) — 800–1 200 ₽.
• TAM-133 (for Stinol, Indesit) — 1 000–1 800 ₽.
• EVM-3 (electronic, for Samsung, LG) — 2 000–3 500 ₽.
• Danfoss 077B6 (for Beko, Ariston) — 1 500–2 500 ₽.

⚠️ Attention! Prices and availability of spare parts may vary depending on the region. Before purchasing, check the compatibility of the thermostat with your refrigerator model - some parts are similar in appearance, but have different characteristics (for example, response temperature range).

Where can I find the connection diagram? If you have lost a photo of the wires, you can:

• Find in the instructions for the refrigerator (section "Electrical diagram").
• Download on sites like ManualsLib or All-Guides (enter the refrigerator model).
• Request at the manufacturer's service center (sometimes they send diagrams by email).

FAQ: Frequently asked questions about refrigerator thermostats

Can the thermostat be repaired or just replaced?

Mechanical thermostats (K-59, TAM-133) are usually not repaired - they are replaced entirely. Exception: if the problem is in oxidized contacts (they can be cleaned with sandpaper). Electronic thermostats can sometimes be repaired (replacing the sensor, soldering the tracks), but this requires experience in working with microcircuits.

How to check the thermostat. multimeter?

Switch the multimeter to the “continuity” mode (or resistance measurement). Connect the probes to contacts “3” and “4” (for K-59) or “1” and “2” (for TAM-133. Rotate the thermostat knob: in the “Off” position, the resistance should be ∞ (open), in the "On" position - 0 Ohm (closed). If the readings do not change, the thermostat is faulty.

What to do if after replacing the thermostat the refrigerator does not freeze?

Possible reasons:

1. Wrong connection of the wires - check the circuit.
2. The new thermostat is faulty - test it with a multimeter.
3. Out the control board is faulty (in electronic models).
4. Freon leak - in this case, the compressor will turn on, but there will be no cooling.

If you are not sure of the diagnosis, call a technician - some breakdowns (for example, a refrigerant leak) require special equipment.

Is it possible to use a thermostat from another model refrigerator?

Yes, but only if they match:

• Type (mechanical/electronic).
• Voltage (220–240 V).
• Length of capillary tube (for mechanical models).
• Contact resistance (for electronic ones).

For example, a thermostat K-59 is suitable for Atlant MXM-1708 i Minsk-15M, and TAM-133 — for Stinol-102 i Indesit BIAA 13.

How long does it take to replace a thermostat?

In mechanical refrigerators (Atlant, Birusa) - 30–60 minutes. In electronic (Samsung, LG) - 1–2 hours (care is required when working with the board). If this is your first time doing repairs, please have time and patience!