Refrigerators LG are known for their reliability, but even they sometimes require diagnostics - especially when it comes to incorrect operation of temperature modes. If your unit begins to freeze too much, does not cool enough, or produces errors like Er IF or Er rF, the problem may lie in temperature sensor. But where exactly to look for it? Depending on the model and cooling system (No Frost, drip, Linear Cooling) the location of the sensors varies - and this often confuses even experienced craftsmen.
In this article we will look at where the temperature sensors are located in refrigerators LG different series (from budget GA-B419 to premium InstaView Door-in-Door), how to identify them visually and what signs indicate a malfunction. You will also find out whether it is possible to check the sensor without special equipment and when it is worth contacting service. For clarity, we present diagrams and photos from real models - this will help to avoid mistakes in self-diagnosis.
Types of temperature sensors in LG refrigerators
In modern refrigerators LG it is used from 2 to 5 temperature sensors, each of which is responsible for its own zone. Their type and quantity depend on the cooling system and functionality of the model. Here are the main varieties:
- 🔹 NTC thermistors - the most common type. Their resistance decreases when heated. Used in 90% of models LG, including series GA, GB, GC.
- 🔹 PTC thermistors - less common, resistance increases with increasing temperature. They are most often installed in freezers of premium models.
- 🔹 Digital sensors - are used in refrigerators with a Smart ThinQ system (for example, LRMVC2306S). They transmit data to the control board in digital format.
- 🔹 Evaporator sensors - control the temperature on the radiator No Frost. They often fail due to icing.
It is important to understand that in refrigerators with Linear Cooling (for example, GR-B247JVQA) sensors can be duplicated for more accurate control. For example, in the main chamber there are two of them: one at the back wall, the other in the freshness zone Fresh Balancer.
Where the sensor is located in the main chamber of the LG refrigerator
In main compartment (not the freezer!) the temperature sensor is usually located in one of three places. Its exact position depends on the design of the model:
- Rear wall is the most common place. The sensor is hidden under a plastic panel next to the light bulb or fan (in models with No Frost). To see it, just remove the cover by unlatching the latches.
- Upper part of the chamber - typical for refrigerators with the Multi Air Flow system (for example, GA-B429). The sensor can be mounted in the air duct.
- Freshness zone — in models with a compartment Fresh Balancer or DoorCooling+ (for example, GC-B247) an additional sensor is installed directly in the plastic case box.
Visually, the sensor is a small cylinder with a diameter of 5–8 mm with two wires (usually red and white or black). In refrigerators LG 2018–2026, it is often enclosed in a transparent silicone case to protect it from moisture.
How to distinguish the sensor from other elements?
The temperature sensor is easily confused with door closing sensor (located on body) or humidity sensor (found in freshness zones). The main difference is that the temperature sensor always has two wires, and the door sensor has three (or four in new models).
| LG refrigerator model | Cooling system type | Sensor location in the main chamber |
|---|---|---|
| GA-B419, GA-B429 | Drip | Rear wall, under the lighting panel |
| GC-B247, GC-X247 | No Frost + Linear Cooling | Upper air duct and zone Fresh Balancer |
| LRMVC2306S | Smart ThinQ + DoorCooling+ | Two sensors: at the evaporator and in door |
| GR-B207, GR-B247 | No Frost (budget) | Rear wall, next to the fan |
⚠️ Attention: In refrigerators LG with function Express Freeze (fast freezing), the main chamber sensor can be connected to a separate connector on the control board. When replacing, it is important not to mix up the wires - this will lead to an error. Er CF.
Location of the sensor in the freezer compartment
B freezer The temperature sensor is usually located in a more accessible place than in the main chamber. This is due to the need to quickly react to changes in modes (for example, when activated Super Freeze). Typical places:
- 🔸 On the evaporator — in models with No Frost (for example, GA-B489) the sensor is attached directly to the radiator or next to it. It is often covered with a layer of frost, which complicates diagnostics.
- 🔸 In the ceiling of the chamber —in refrigerators with a top freezer (for example, GR-N309) the sensor is built into a plastic panel under the lid.
- 🔸 On the back wall —in drop freezers (rarely found in new models LG), the sensor can be hidden under a metal plate.
A feature of freezer sensors is that they are often have reinforced wire insulation (for example, in models InstaView use Teflon-coated wires), as they operate at temperatures down to –24°C. During a visual inspection, pay attention to the integrity of the insulation: cracks or abrasions can cause false alarms and errors Er FF.
How to check a temperature sensor without instruments
If you suspect a sensor malfunction, you can first check without a multimeter. This method is not 100% accurate, but it helps identify obvious problems:
Inspect the wires for damage or oxidation|
Check that the sensor is not covered with ice (especially in the freezer)|
Turn off the refrigerator for 10 minutes and turn it on again - if the error disappears, the problem may be in the board, not in the sensor|
Listen to the operation of the compressor: if it turns on for 2-3 seconds and turns off, this may indicate a sensor malfunction|-->
A more accurate method - test with a multimeter. To do this:
- Disconnect the sensor from the control board (usually a connector with 2 contacts).
- Switch the multimeter to resistance measurement mode (20 kOhm).
- Measure the resistance of the sensor at room temperature (~20°C). For NTC thermistors it should be within 4–6 kOhm.
- Place the sensor in a glass of cold water (5–10°C) - the resistance should increase to 8–12 kOhm.
If the readings do not change or the sensor shows a break (OL on the multimeter), it needs to be replaced. In refrigerators LG with digital sensors (for example, in models with Smart Diagnosis) this method will not work - specialized equipment will be required to read the signal.
⚠️ Attention: In refrigerators LG with inverter compressors (series Linear) faulty the sensor may cause motor overheating due to continuous operation. If, after disconnecting the sensor, the compressor begins to operate stably, the problem lies with it.
Signs of a malfunctioning temperature sensor
Failure of the temperature sensor is manifested not only by errors on the display. Here are the key symptoms that you should pay attention to:
- ❄️ Continuous operation of the compressor —the refrigerator does not turn off, although the temperature in the chamber has long reached the set temperature.
- 🔥 Too warm air —food spoils, despite the fact that the compressor is running.
- ⚡ Frequent on/off —the compressor starts for 5–10 seconds and stops (the so-called “relay clicking”).
- 📛 Errors on the display:
Er IF—problem with the evaporator sensor;Er rF— malfunction of the freezer chamber sensor;Er dH— short circuit in the sensor circuit.
In refrigerators with a system Smart ThinQ a sensor malfunction can lead to independent temperature change (for example, the freezer suddenly goes into mode Super Freeze). Also pay attention to condensation on the rear wall in models with No Frost this is an indirect sign that the evaporator sensor is transmitting incorrect data.
How to replace a temperature sensor yourself
Replacing a sensor in a refrigerator LG is a task of medium complexity that requires accuracy and basic skills in working with equipment. Here are step-by-step instructions:
- Disconnect the refrigerator unplug and wait until the ice in the freezer melts (if the sensor is located on the evaporator).
- Remove the protective panels:
- In the main chamber - pry up the plastic cover next to the lamp.
- In the freezer - unscrew the screws on the back wall (you will need a Phillips screwdriver).
The cost of a sensor for LG varies from 500 to 2500 rubles depending on the model. For example, an original sensor for GA-B419 (article 6601JB1006A) will cost ~800 rubles, and for GC-B247 s Linear Cooling (article 6601JB2007B) - about 1800 rubles. When purchasing, check the compatibility using the VIN code of the refrigerator (located on the sticker inside the chamber).
⚠️ Attention: In refrigerators LG with a system DoorCooling+ (for example, LRMVC2306S), the sensor in the door is attached to double-sided tape. When replacing, use heat-resistant glue (for example, Loctite 326), otherwise the sensor may fall off over time.
When to contact service: 3 cases
Not all problems with temperature sensors can be solved on your own. Here are situations when you should turn to professionals:
- The error does not disappear after replacing the sensor — this may indicate a faulty control board (especially in models with Smart ThinQ).
- The refrigerator displays several errors at the same time (for example,
Er IF+Er dH) - complex diagnostics is required. - The sensor is soldered into the board —in some premium models (for example, Signaturethe sensors are integrated into the electronic module. Self-repair is impossible here.
Medium. the cost of diagnostics in service centers LG — 1500–2500 rubles. If the problem is in the control board, its replacement will cost 5000–12000 rubles (depending on the model). In cases where the refrigerator is under warranty, not. disassemble it yourself this will void the warranty.
FAQ: Frequently asked questions about temperature sensors in LG
Is it possible to clean the temperature sensor with alcohol or water?
No, it is strictly not recommended to use alcohol or water to clean the sensor. Alcohol can damage the silicone insulation, and water can cause corrosion of the contacts. To remove dust or frost, just carefully blow off the sensor with compressed air (for example, with a can for cleaning equipment), if there are greasy stains on the sensor, wipe it off. it with a dry lint-free cloth.
Why does the LG refrigerator work unstably after replacing the sensor?
This can happen for three reasons:
- Incorrect connection of the connector (wires are mixed up).
- Incompatibility of the sensor with the refrigerator model (even if visually it looks the same).
- Problems with the control board that were not identified before replacement.
Check whether the article number of the new sensor matches the original one. If the problem persists, contact the service to diagnose the board.
How to reset. temperature sensor error on the display?
In most models LG the error can be reset by simultaneously pressing and holding the Freezer and Fridge buttons for 5-10 seconds. In refrigerators with a touch screen (for example, InstaView) try the combination: press and hold Ice Plus and Door Alarm until a beep sounds. If the error appears again, the sensor needs to be replaced or the board repaired.
Can a faulty temperature sensor cause a compressor to break down?
Yes, but only in refrigerators with inverter compressors (series Linear). If the sensor transmits incorrect data, the compressor can work without stopping, which leads to its overheating. In conventional models with a relay, the compressor will simply turn on/off more often, but the risk of failure is minimal. Signs of overheating of the inverter compressor: strong hum, hot housing at the back, error Er CH.
Where to buy an original sensor for an LG refrigerator?
It is better to buy original sensors in the following places:
- Official service centers LG (warranty for the part is 6-12 months).
- Stores of spare parts for household appliances (for example, 220-Volt, All-Spares).
- Platforms like AliExpress or eBay - but only from verified sellers with a rating above 98%. Pay attention to reviews and photographs of the actual product.
Before purchasing, check the sensor article number with what is indicated in the instructions or on the sticker inside the refrigerator.