How to properly remove the thermostat from a refrigerator: instructions for different models

Thermostat (or thermostat) is a key element of the refrigerator, responsible for maintaining the set temperature. When it fails, the refrigerator stops freezing, runs without stopping, or, conversely, turns off too early. Replacing the thermostat is one of the most common repair operations that you can do yourself, saving on calling a technician. However, improper dismantling can lead to damage to the capillary tube, freon leakage or short circuit.

In this article we will look at how to remove the thermostat from refrigerators of different brands (Atlant, Indesit, Samsung, LG, Biryusa etc.), what tools will be needed, and What to pay attention to so as not to aggravate the breakdown. You will also find unique wiring diagrams for popular modelswhich are rarely found in open sources.

Signs of a thermostat malfunction: when replacement is needed

Before removing the thermostat, make sure that it is the problem. Here are the typical symptoms:

• 🔴 The refrigerator does not turn on at all (there is no sound of the compressor running).
• ❄️ The freezer freezes food, and the main compartment is too warm.
• 🔄 The compressor runs non-stop, not responding to temperature changes.
• 💡 The light inside is on, but there is no cooling.
• 🔊 The relay clicks too often or is absent altogether.

If at least one of these signs is observed, there is a high probability that the thermostat has failed. However before dismantling check:

• 🔌 The reliability of connecting the refrigerator to the network (perhaps the problem is in the socket or cord).
• 🧊 The cleanliness of the condenser (a dusty grill on the back wall can simulate thermostat breakdown).
• 🔧 Correct setting of the temperature mode (perhaps the adjustment knob is out of order).

For accurate diagnostics, you can check the thermostat with a multimeter. If, when you rotate the adjustment knob, the resistance between the contacts does not change (or is equal to zero/infinity), the part is faulty.

Tools and materials for removing the thermostat

To remove the thermostat, prepare:

Additionally, you may need:

• 📸 Camera (to photograph the wiring diagram).
• 🧲 Magnet (to hold small screws).
• 🧴 WD-40 (if the fasteners are rusty).

Step-by-step instructions: how to remove the thermostat from the refrigerator

The dismantling process depends on the refrigerator model, but the general diagram looks like this:

1. Disconnect the refrigerator unplug and remove all products.
2. Remove the top cover (if the thermostat is located on top) or the bottom panel (for models with a bottom location).
3. Disconnect temperature control knob (usually it is secured with a latch or screw).
4. Take a photo of the wire connection to the thermostat (this is critical for proper reassembly!).
5. Disconnect the capillary handset from the evaporator (carefully so as not to bend it!).
6. Unscrew the fastening screws and remove the thermostat.

Now let's look at the nuances for different brands:

Disconnect the refrigerator from the mains|

Defreeze the refrigerator (minimum 2 hours)|

Prepare tools and camera|

Remove decorative panels (top/bottom)|

Mark with a marker the position of the adjustment knob-->

Dismantling features for refrigerators Atlant i Biryusa

In most models of these brands, the thermostat is located inside the refrigerator compartment, under the plastic panel on top. To get to it:

1. Remove the plastic cover above the door (it is secured with latches).
2. Unscrew the two screws holding the control panel.
3. Carefully pull it out temperature control knob (it sits on the slot of the thermostat).
4. Disconnect the wires, having previously marked them (for example, with tape with numbers).

Attention! In models Atlant with the system No Frost the thermostat can be hidden behind the back panel of the freezer. In this case, you will need to remove the inner lining.

How to remove the thermostat from refrigerators Indesit i Samsung

For these brands, the thermostat is often located outsideon the back wall, next to the compressor. Algorithm of actions:

1. Unscrew the screws of the rear protective cover.
2. Find the thermostat - this is a small box with a capillary tube coming out of it.
3. Disconnect the tube from the evaporator (it is attached clamp or clip).
4. Remove the terminals from the wires (remember their location!).
5. Unscrew the fastening nuts or screws and remove the thermostat.

In models Samsung with a display, the thermostat can be integrated into the electronic control unit. In this case, you will need a complete replacement of the moduleand not a separate part.

What to do if the capillary tube breaks off?

If the tube going from the thermostat to the evaporator is broken, it can be carefully soldered silver solder (not ordinary tin!). However, it is better to replace the entire thermostat, since after soldering, refrigerant leaks through microcracks are possible.

Wire connection diagrams: how not to mix up the contacts

An error in connecting the wires can lead to short circuit or failure of the compressor. Below are typical diagrams for popular models:

If your model has wires of other colors, be guided by their location:

• 🔌 Phase usually goes from the plug directly to the thermostat.
• ⚡ Zero often connected to the body or goes to a light bulb.
• 📡 Signal wire (to the compressor) - the thinnest, can be braided.

Attention! In refrigerators with No Frost the thermostat may have additional contacts to control the fan and defrost heating element. Do not connect them at random!

Common mistakes when removing a thermostat and how to avoid them

Even experienced craftsmen sometimes make mistakes that lead to additional breakdowns. Here are the most common:

• ⚡ Damage to the capillary tube during dismantling. It is very fragile - do not bend it or pull it by the end.
• 🔌 Mixed up wires when connecting back. Always check the circuit with a multimeter before assembly.
• 🔧 Lost screws or latches. Use a magnet to avoid losing fasteners.
• 🧊 Incomplete defrosting before work. Ice on the evaporator may interfere with dismantling.
• 📸 Lack of photo of the original assembly. Without it, it will be difficult to restore the connection.

Another typical problem is damage to the sealing rubber band doors when removing the top panel. To avoid this, pry the panel with a flat screwdriver carefully, without applying force to the rubber band.

If, after replacing the thermostat, the refrigerator does not turn on:

1. Check whether the wires are connected correctly (especially phase and neutral).
2. Make sure that the capillary tube fits tightly to the evaporator.
3. Test the thermostat with a multimeter - it may also be defective.

How to check the removed thermostat for functionality

Before installing a new thermostat, make sure that the old one is really faulty To do this:

1. Place the thermostat in a container with cold water (temperature about +5°C).
2. Connect the multimeter in dial mode to the contacts 3 and 4 (usually these are signal pins).
3. If during cooling the circuit opens, and when heating (for example, in warm water) it closes, the thermostat is working.
4. If the resistance does not change or is zero/infinity, the part must be replaced.

For electronic thermostats (for example, in Samsung or LG) the check is more complicated:

• 🔍 You will need a connection diagram (it can be found according to the refrigerator model).
• 📊 The output voltage is checked at different temperatures (for this you need an adjustable heat source).

Attention! Some thermostats (for example, in refrigerators Lieberr) have non-separable housing. They can only be checked by replacing them with a known working one.

Installing a new thermostat: step-by-step algorithm

Installing a new one thermostat is performed in the reverse order:

1. Connect the capillary tube to the evaporator (it should fit tightly, without gaps).
2. Connect the wires according to the diagram (use your photographs or markings).
3. Fix the thermostat in its original place with screws or latches.
4. Replace the temperature control knob (it should fit tightly on the slot).
5. Return the decorative panels and covers in place.
6. Connect the refrigerator to the network and check the operation.

After installation:

• 🕒 Let the refrigerator operate for 2-3 hours so that the temperature stabilizes.
• 📏 Check whether the compressor turns off (if not, there may be a connection error).
• ❄️ Make sure that frost begins to form in the freezer.

If the refrigerator does not turn on:

• 🔌 Check whether voltage is supplied to the thermostat (perhaps the problem is in the power cord).
• 📡 Make sure that the signal wire is correctly connected to the compressor.
• 🔧 Recheck the fastening of the capillary tube - it must touch the evaporator.

FAQ: Frequently asked questions about replacing the thermostat

Is it possible to replace the thermostat without defrosting the refrigerator?

Technically it is possible, but not recommended. Ice on the evaporator prevents removal of the capillary tube, and condensation on the wires can cause a short circuit. Defrosting takes 2–4 hours, but guarantees safety.

Which thermostat is suitable as a replacement for a refrigerator Atlant?

For most models Atlant suitable thermostats K-59 (mechanical) or TAM-133 (for No Frost). Check the exact model by the marking on the old thermostat or in the documentation.

What to do if after replacing the thermostat the refrigerator runs non-stop?

Probable causes:

1. The wires are connected incorrectly (check the phase and signal contact).
2. The capillary tube does not touch the evaporator (reinstall it).
3. The new thermostat is defective (check it with a multimeter).

Is it possible to repair a thermostat instead of replacing it?

Mechanical thermostats cannot be repaired (they are sealed). You can try to restore electronic ones if the problem is in the contacts or soldering, but more often it is easier and cheaper to replace the entire module.

How much does it cost to replace a thermostat in a service center?

The cost depends on the model of the refrigerator and the type of thermostat:

• Mechanical thermostat: 1500–3000 ₽ (with work).
• Electronic thermostat: 3000–6000 ₽.
• Replacement in refrigerators No Frost: 4000–8000 ₽ (due to difficulty of access).

Independent replacement costs 500–2000 ₽ (cost of the part).