How to correctly install the thermostat on the refrigerator: instructions with photos and tips

The thermostat is the “brain” of the refrigerator, which controls the temperature and controls the operation of the compressor. If it fails, the equipment stops freezing, works without stopping, or, conversely, turns off at the most inopportune moment. Replacing a thermostat is one of the most common operations when repairing refrigerators, and you can do it yourself, without resorting to the services of a technician.

In this article we will look in detail at how to install a thermostat on refrigerators of different brands (Indesit, Atlant, Samsung, Stinol and others), what tools will be needed, how to check the functionality of the part before installation and avoid common mistakes. You will also learn how to calibrate a new thermostat so that the refrigerator operates as efficiently as possible.

Signs of a thermostat malfunction: when replacement is needed

Before you start replacing, make sure that the problem is in the thermostat. Here are the key symptoms of its breakdown:

• 🔴 Refrigerator does not turn on or turns on for a few seconds and immediately turns off.
• ❄️ Compressor works without stopping, but the temperature in the chambers is not drops to the required level.
• 🌡️ In the freezer compartment ice has formed, and in the refrigerator it is too warm (or vice versa).
• 🔊 You can hear relay clicks, but the engine does not start.
• 💡 The light inside is on, but there is no cooling.

If at least one of these signs appears, with an 80% probability the thermostat is to blame. However, before replacing, check:

• 🔌 Power — there may be a problem in the socket or power cord.
• 🧊 Door seal —if it is damaged, the cold goes away and the thermostat may not work correctly.
• ⚙️ Temperature settings — sometimes users accidentally turn the knob to minimum.

⚠️ Attention: In refrigerators with electronic control (for example, Samsung No Frost or LG Inverter) instead of a mechanical thermostat, temperature sensor and control board. Replacing them requires other skills and is often impossible without diagnostic equipment.

What tools and spare parts will be needed

Replacing the thermostat does not require professional tools - the minimum is enough set:

When buying a thermostat, pay attention to:

• 📌 Refrigerator model — thermostats differ in resistance, capillary tube length and mounting. For example, for Atlant MHM-170 suitable TAM-133, and for Indesit B18 — K59-L1954.
• 🔧 Type of fastening — some thermostats are fixed with screws, others with latches.
• 📏 Length of the capillary tube —it must correspond to the original one, otherwise the readings will be inaccurate.

⚠️ Attention: If you buy thermostat AliExpress or Wildberries, check with the seller whether the part is suitable for your model. Photos in the product card are often universal and do not reflect real compatibility.

Preparing the refrigerator for replacement thermostat

Before starting work, be sure to:

1. Disconnect the refrigerator from the mains and wait 10–15 minutes —this is necessary to discharge the capacitors (in some models they can retain voltage).
2. Remove all products and defrost the chambersif they are covered with ice. This will simplify access to the parts.
3. Remove shelves and drawers that may interfere with dismantling the control panel.

Then proceed depending on the design of the refrigerator:

• 🔹 In models with mechanical control (handle inside the chamber) the thermostat is usually located behind the plastic panel in the upper part of the refrigerator compartment.
• 🔹 In refrigerators with electronic display (for example, Samsung RL-34) the thermostat can be located behind the back wall or in the control module.
• 🔹 In two-chamber models (for example, Atlant XM 4026) are sometimes installed two thermostats -separately for the refrigerator and freezer compartments.

To get to the thermostat in refrigerators with an internal regulator (for example, Stinol 102 or Birusa 140), follow these steps:

1. Remove decorative trim around the temperature control knob (usually it is held on by latches).
2. Unscrew screwsthat secure the plastic panel inside the chamber.
3. Carefully remove the panel without damaging capillary tube the thermostat (it is thin and bends easily).

Disconnect the refrigerator from the mains|Defrost and remove food|Remove shelves and drawers|Take photographs of wire connections|Prepare a new thermostat and tools-->

Step-by-step instructions for replacing the thermostat

The replacement algorithm is the same for most refrigerators with mechanical control (Indesit, Atlant, Stinol, Nord etc.). Let's look at the process using the model as an example Indesit B16FNF:

1. Disconnect the wires from the thermostat.

   Take a photo of the connection diagram or mark the wires with a marker. Usually there are 3–4 of them:

   • 🔌 Brown/black —phase (power).
   • 🔌 Blue —zero.
   • 🔌 Yellow/green —grounding (if yes).
   • 🔌 Orange/red —wire to the compressor.

Some models may have an additional wire for lighting lamp.

Remove the old thermostat.

Unscrew the mounting screws (usually 2 pieces) and carefully pull out the thermostat along with capillary tube. Do not pull the tube - it is fragile!

Install a new thermostat.

Place it in place of the old one, secure it with screws and connect the wires according to the diagram. Make sure that capillary tube is not pinched and does not touch hot parts (for example, a compressor).

Check the operation.

Turn on the refrigerator and set the regulator to the middle position. After 10–15 minutes the compressor should start, and after an hour it should turn off (if the thermostat is working properly).

For refrigerators with electronic control (for example, Samsung RL-33) the process is more complicated:

• 🔧 The thermostat is often built into control board, and its replacement requires soldering.
• 🔧 Sometimes it is enough to replace temperature sensor (it looks like a small plastic cylinder with wires).
• 🔧 In such cases, it is better to contact a specialist, since an error can damage the entire board.

What to do if after replacement the refrigerator does not turn on?

If the compressor does not start, check:

1. The wires are connected correctly (compare with the diagram or photo).

2. Availability of power in the outlet (try another device).

3. Integrity of the fuse (if your model has one).

4. The performance of the new thermostat (check with a multimeter).

If everything is in order, but the refrigerator does not work, there may be a problem with the compressor or the start relay.

How to check the thermostat with a multimeter before installation

Even a new thermostat can be defective. Before installation, check its functionality:

1. Contact continuity.

   Switch the multimeter to continuity (or resistance measurement) mode and check:

   • 🔋 Contacts 3 and 4 (usually these are terminals for the compressor) - in position Off. they should be closed (resistance ~0 Ohm).
   • 🔋 When turning the knob to position Max the contacts should open.

Checking the capillary tube.

Dip thermostat bulb (the metal cylinder at the end of the capillary tube) into a glass with ice water. After 1–2 minutes, the contacts should closed (the compressor will turn on).

If the thermostat does not respond to temperature changes or the contacts do not close/open - the part defective.

⚠️ Attention: In thermostats with anti-icing system (for example, in some models Samsung) there may be an additional contact for defrosting. It also needs to be checked for short circuit when turning the knob.

Calibrating the thermostat: how to set the optimal temperature

After replacing the thermostat, the refrigerator may work unstably: it may freeze too much or, conversely, not cool well. This is due to incorrect calibration. Here's how to do it:

1. Set the knob to the middle position (usually this is 3–4 on a scale from 1 to 7).
2. Place the thermometer in the refrigerator compartment (on the middle shelf) and leave for 6-8 hours.
3. Check the temperature:
   • 🥶 Optimal range for the refrigerator compartment: +2…+5°C.
   • ❄️ For the freezer: –18…–24°C.

If the temperature is outside these limits, adjust the position of the knob.

In some models (for example, Atlant or Stinol) the thermostat has calibration screw under the plastic cover. It can be tightened with a screwdriver for more precise adjustment:

• 🔩 Turning clockwise arrow will increase the temperature (the compressor will turn on less often).
• 🔩 Turning counterclockwise will reduce the temperature (the compressor will work longer).

Important: not all thermostats have a calibration screw. Do not confuse it with the mounting screws! housing.

Common mistakes when replacing a thermostat and how to avoid them

Even experienced technicians sometimes make mistakes that lead to repeated breakdowns. Here are the most common ones:

Another typical problem is incorrect installation. thermostat flaskIt should:

• 📍 Be at a distance of 5–10 cm from the chamber wall (not close!).
• 📍 Be fixed so that it does not dangle (for example, using a plastic clamp).
• 📍 Do not touch products or shelves - this will distort the readings.

FAQ: Answers to frequently asked questions

Is it possible to repair an old thermostat or just replace it?

In 90% of cases, thermostats cannot be repaired are replaced with new ones. Exception: if the problem is in oxidized contacts (they can be cleaned) or loose fastening capillary tube. But even after such repairs, the part often works unstably.

How much does a thermostat cost and where to buy it?

The price depends on the model:

• 💰 For budget refrigerators (Atlant, Birusa) — 500–1200 ₽.
• 💰 For imported ones (Indesit, Samsung) — 1500–3000 ₽.
• 💰 For premium brands (Liebherr, Bosh) — from 4000 ₽.

You can buy:

• 🛒 In the manufacturer's service centers.
• 🛒 On AliExpress (cheaper, but longer delivery).
• 🛒 In stores spare parts for household appliances (for example, “Chip and Dip”)

How to understand that the thermostat is working correctly after replacement?

Signs of proper operation:

• ✅ Compressor turns on 5-15 minutes after installation temperature.
• ✅ After 1–2 hours turns off (if the door was not opened).
• ✅ The temperature in the chambers corresponds set (check with a thermometer).
• ✅ No extraneous sounds (clicks, hum).

If the compressor works continuously or does not turn on at all - the thermostat is faulty or connected incorrectly.

Is it possible to replace the thermostat in a refrigerator with No Frost?

Yes, but the process is more complicated:

• 🔧 In systems No Frost often used electronic sensorrather than a mechanical thermostat.
• 🔧 Replacement requires control board diagnostics - without soldering skills it is not possible get by.
• 🔧 Sometimes the problem lies not in the sensor, but in defrost timer or heater evaporator.

If you are not confident in your abilities, it is better to call a specialist.

What to do if after replacing the thermostat the refrigerator gets very cold?

Possible reasons:

• ❄️ Thermostat not calibrated — try turning the knob to a lower value.
• ❄️ Capillary tube pressed to wall —it should hang freely in the chamber.
• ❄️ Incorrectly connected contacts —check the diagram.
• ❄️ New thermostat incompatible with refrigerator model.