Modern refrigerators Whirlpool are complex climate systems, where maintaining a given microclimate is entirely dependent on electronics. The key element of this system is temperature sensor, which continuously sends signals to the control board. It is this small component that dictates to the compressor when to turn on for cooling and when to stop.
If you notice that the food in the chamber begins to freeze or, conversely, spoil from the heat, the problem often lies in this sensor. It may transmit incorrect data or fail completely. Understanding where the sensor is locatedis the first and most important step to self-diagnosis and repair of your equipment.
In this article we will analyze in detail the location of thermistors in various brand models Whirlpool, consider methods for checking them and describe the replacement procedure. You do not need to be a professional engineer to understand the basic device, but accuracy and attentiveness are required here.
Principle of operation and types of Whirlpool sensors
Refrigerators Whirlpool use thermistors, the resistance of which varies depending on the ambient temperature. The electronic module reads these resistance changes and translates them into temperature values. Unlike old mechanical thermostats, modern ones do not have moving parts, which makes them more reliable, but electronically dependent. Thermistors The number of sensors in one unit can vary from one to five or more, depending on the number of cameras and the availability of the function. data-i="59">. Typically, sensors are installed in the evaporator, in the air duct, on the back wall of the refrigerator compartment and sometimes in the freshness zone. Each of them is responsible for its own control area. thermistors have no moving parts, which makes them more reliable, but electronically dependent.
The number of sensors in one unit can vary from one to five or more, depending on the number of cameras and the availability of the function No Frost. Typically, sensors are installed in the evaporator, in the air duct, on the back wall of the refrigerator compartment and sometimes in the freshness zone. Each of them is responsible for their own control area.
It is important to understand that sensor malfunction often simulates a compressor breakdown or freon leak. The unit may hum non-stop or remain silent for days. Accurate diagnostics begins with a visual search and resistance check.
⚠️ Attention: Before starting any work to find or replace sensors, be sure to disconnect the refrigerator Whirlpool from the electrical network. Working with live electronics is dangerous and can short-out the control board.
Location of the sensor in the refrigerator compartment
In refrigerators Whirlpool with a system No Frost or static cooling, the main sensor is often hidden behind plastic panels. In classic models, it can be installed in a special plastic casing on the rear wall, hidden behind the shelves. To get to it, it is often necessary to dismantle the internal elements.
In models with a display on the door, the sensor can be integrated into the control unit or located next to it, reading the air temperature at the entrance to the chamber. In more complex systems Whirlpool 6th Sense sensors can be built into the ceiling of the chamber or side walls, disguised as decorative elements.
To access the sensor in the rear, you usually need:
- 🔹 Completely empty the refrigerator compartment of food.
- 🔹 Remove all shelves and drawers for vegetables to provide free access to the rear wall.
- 🔹 Carefully unscrew or unscrew the plastic panel covering the technical components.
- 🔹 Find the wire element enclosed in a plastic tip or metal sleeve.
Visually serviceable sensor must not have traces of oxidation, cracks or melted insulation. If you see condensation inside the connector or corrosion on the contacts, this is a sure sign of the need for replacement.
Looking for the thermistor in the freezer and No Frost system
In the freezer compartment, especially in systems No Frost, sensors play a critical role in defrost cycles. They are located directly on the evaporator or near the heating element. Getting to them is more difficult, since it requires partial disassembly of the case or removal of the rear panel inside the freezer.
Often the defrost sensor is attached to the evaporator fins using a special clip or inserted into a hole in an aluminum tube. In refrigerators Whirlpool it can be located in the lower part of the evaporator, hidden behind the plastic duct cover. It is this sensor that tells the board that there is enough ice and it’s time to turn on the heating element.
If the sensor is stuck in the “defrost” position, the refrigerator will stop freezing. If it shows “cold” constantly, a coat of ice will build up on the evaporator, which will block the air circulation. To search, follow these steps:
- ❄️ Defrost the refrigerator for 12-24 hours (for safety when disassembling).
- ❄️ Remove the inside back panel of the freezer (usually held on by screws or latches).
- ❄️ Inspect the area around evaporator and heater.
- ❄️ Look for the wire going to the aluminum radiator or plastic duct housing.
The design may vary depending on the series Whirlpool. In some models, the sensor is built into the plastic panel itself, and replacing it requires removing the entire structure.
⚠️ Attention: Plastic becomes very fragile at low temperatures. If you disassemble the freezer without first defrosting, there is a high risk of breaking fasteners or damaging the sensor housing.
Table of location of sensors in popular Whirlpool series
Different lines of refrigerators Whirlpool have their own design features. Below is summary information that will help you navigate the search for an item depending on the series of your device.
| Refrigerator series | System type | Location of the main sensor | Access features |
|---|---|---|---|
| Whirlpool WBE | No Frost | For rear panel in the freezer | Requires removal of the evaporator panel |
| Whirlpool WBA/WBD | Static / No Frost | In a plastic casing on the rear wall of the cold storage unit | Access without disassembling the case |
| Whirlpool W7 | 6th Sense | Integrated into the control panel/ceiling | Difficult disassembly, requires experience |
| Whirlpool ARC | Combined | In the niche under the lighting lamp | Removing the lamp shade |
This table is for reference only. The design of a particular instance may vary depending on the year of manufacture and region of assembly.
⚠️ Attention: Design features of models may vary depending on the year of manufacture. If the description does not match your device, be guided by the visual presence of thermistors and wires in accessible areas, checking the technical diagram of the specific model.
Why do sensors fail?
The main cause of failure is natural wear and tear and leakage of the sensor housing. Moisture penetrating inside oxidizes the contacts, causing the resistance to change chaotically. Also, the cause may be a power surge in the network or mechanical damage when defrosting with sharp objects.
Diagnostics and testing with a multimeter
After you have found the expected location of the sensor, it needs to be checked. Visual inspection does not always provide a 100% guarantee of serviceability. The main diagnostic method is to measure resistance using a multimeter. location of the sensor, it must be checked. Visual inspection does not always provide a 100% guarantee of serviceability. The main diagnostic method is to measure resistance using a multimeter.
To check, disconnect the sensor connector from the control board. Switch the multimeter to resistance (ohms) measurement mode. At room temperature (about +20...+25°C), a working thermistor Whirlpool usually shows a resistance in the range from 4 to 7 kOhm, but the exact values depend on the model.
Critical important point: resistance must change with temperature. If you hold the sensor in your hand, it will heat up and the readings on the device should change (usually decrease). If the device shows a “break” (infinity) or “zero” (short circuit) regardless of temperature, the element is faulty.
The test process looks like this:
- 🔌 Disconnect the refrigerator from the network.
- 🔌 Remove the sensor connector from boards.
- 🔌 Connect the multimeter probes to the sensor contacts.
- 🔌 Record the readings and warm up the sensor by hand.
If you are not sure of your readings, compare them with the resistance table for a specific model Whirlpool, which can be found in the service manual.
☑️ Checklist for checking the sensor
Instructions for replacing a faulty element
If the diagnostics showed malfunction replacing the sensor is the only solution. Do not try to repair the old sensor, as it is impossible to restore the tightness, and an error in measurements will lead to unstable operation of the refrigerator.
To replace, you will need a new sensor with similar characteristics (resistance and mounting geometry). Refrigerators Whirlpool often use universal sensors, but it is better to select an original or a high-quality analogue.
Procedure for replacement:
Carefully remove the old sensor from its seat. If it is secured with a clip, press it out. If the sensor is inserted into a hole in the evaporator, be careful not to damage the aluminum tubes. The new element is installed in the reverse order.
Pay special attention to the connection of the wires. It is better to solder the twists and insulate them with heat shrink to avoid oxidation in high humidity conditions. After assembly, turn on the refrigerator and monitor its operation for several hours.
Frequently asked questions (FAQ)
Is it possible to operate a Whirlpool refrigerator with a faulty sensor?
It is strictly not recommended. A faulty sensor will lead to improper operation of the compressor, which can cause either defrosting of food or freezing of the evaporator and failure of the compressor due to constant operation.
Where to buy an original temperature sensor for Whirlpool?
Original spare parts can be found in authorized service centers or specialized stores of spare parts for household appliances. When purchasing, pay attention to the markings and resistance specified in the documentation.
Why does the refrigerator not work correctly after replacing the sensor?
Perhaps a sensor with the wrong resistance was installed, or the tightness of the connection was broken. Also, the problem may lie not in the sensor itself, but in the control board or wiring.
How many temperature sensors are usually installed in a Whirlpool refrigerator?
In simple models - one or two. In modern two-chamber systems No Frost with function 6th Sense their number can reach four or more (in the refrigerator, freezer, on the evaporator, in the freshness zone).