Where is the temperature sensor in the Ariston refrigerator: search, check and replacement

Refrigerators Ariston (including branded models Hotpoint-Ariston) are equipped with thermal sensors that monitor the temperature in the chambers and transmit signals to the control board. When the sensor fails, the refrigerator begins to work incorrectly: it either does not turn off at all, or, conversely, does not cool enough. But before replacing, you need to know exactly where is the temperature sensor in your model - its location depends on the type of refrigerator (single-chamber/double-chamber), defrosting system (No Frost, drip) and even the year of manufacture.

In this article you you will find detailed sensor placement diagrams for popular series Ariston (including MBF, MBA, HBM and others), as well as instructions on how to check them with a multimeter and dismantle them without the risk of damaging the system. We will analyze the features of sensors in the freezer and refrigerator compartments, and also tell you why sometimes the problem lies not in the sensor itself, but in the wiring or control board.

Types of temperature sensors in Ariston refrigerators

In refrigerators Ariston Two main types of temperature sensors are used:

• 🔹 Thermistors (NTC sensors) —the most common option. Their resistance decreases when heated. Used in most models after 2010.
• 🔹 Capillary thermostats - an outdated type, found in refrigerators until 2005–2008. They are a tube with gas connected to a relay.

Modern models (for example, series Ariston HBM 1852 or Hotpoint-Ariston MBA 2201) are equipped with several thermistors:

• 📍 fridge compartment sensor (main)
• ❄️ Freezer chamber sensor
• 🌡️ Ambient sensor (in some models with No Frost)
• 🔄 Evaporator sensor (for systems No Frost)

Important: in refrigerators with electronic control (display on the door) the sensors are connected to the main board, and in models with mechanical control (twist handle) the thermostat is usually combined with a relay and located inside the chamber.

Where is the temperature sensor located in the Ariston refrigerator

In single-chamber refrigerators Ariston (for example, Ariston MB 105) the temperature sensor is usually located:

• 🔍 On the back wall of the chamber, under the plastic panel (with a drip defrosting system).
• 🔍 Inside the plastic box next to the light lamp (in models with a top freezer).
• 🔍 Behind a decorative plug on the ceiling of the chamber (in new models with No Frost).

In double-chamber refrigerators (series HBM, MBA) the refrigeration chamber sensor is most often hidden:

• 📌 Under the top shelf, closer to the rear wall (for example, in Ariston HBM 1852).
• 📌 In a plastic casing next to the fan (in models with No Frost).
• 📌 Behind the control panel (if the sensor combined with the display).

To get to the sensor, you usually need to:

1. Disconnect the refrigerator from the network.
2. Remove shelves and drawers blocking access.
3. Carefully pry up the plastic panel (if the sensor is under it).
4. Disconnect the sensor connector from the wiring.

Location of the temperature sensor in the freezer

In the freezer, the temperature sensor Ariston is most often located:

• ❄️ On the evaporator (in models with No Frost —for example, Ariston HBM 2052). The sensor is attached to a tube or a plastic holder.
• ❄️ Inside the back wall (in drip models). To get it, you need to remove the inner panel.
• ❄️ Under the ice boxes (in refrigerators from the bottom). freezer, for example Ariston MBA 2201).

Features:

• In systems No Frost the freezer sensor is often combined with defrost sensor (defrost).
• In older models (before 2010), the freezer thermostat could be mechanical and located outside, on the back wall of the refrigerator.

Warning: when dismantling the sensor in the freezer do not use sharp tools - you can damage the freon tubes. It is better to remove the plastic panels manually or using a plastic spatula.

How to distinguish the freezer sensor from the refrigerator compartment sensor?

Sensor freezers usually have thicker insulation on the wires (since they work at -18°C and below) and are often painted blue or white. The refrigerator compartment sensor is thinner and can be black or brown.

What does an Ariston temperature sensor look like: photo and connection diagram

Thermistors Ariston usually a small plastic cylinder with two terminals for connecting to wiring. Dimensions:

• 📏 Length: 2–4 cm
• 📏 Diameter: 5–8 mm
• 📏 Wires: 2 insulated wires (most often red). and white or black and brown)

Connection diagram:

Example of sensor appearance:

(Description for visualization: the thermistor is a plastic cylinder with a metal tip, from which two insulated wires extend. Sometimes the sensor is enclosed in an additional protective casing made of foam plastic or rubber.)

How to check an Ariston temperature sensor with a multimeter

To check the temperature sensor, you will need a multimeter with a resistance measurement function (ohmmeter). Procedure:

1. Unplug the refrigerator and remove the sensor (or disconnect its connector from the board).
2. Switch the multimeter to resistance measurement mode (range 20 kOhm).
3. Connect the probes to the sensor terminals (polarity is not important).
4. Measure the resistance at room temperature (+20°C).
5. Heat sensor (you can hold it in your hand or put it in warm water) and measure the resistance again - it should decrease.

Normal resistance values for Ariston NTC sensors:

• 🌡️ +20°C: 5–12 kOhm (depending on the model)
• 🧊 0°C: 12–20 kOhm
• ❄️ -18°C: 30–50 kOhm

If the resistance:

• 🚫 Close to 0 Ohm —short circuit in the sensor.
• 🚫 Close to ∞ (break) —the wire or the thermistor itself is damaged.
• 🚫 Does not change when heating/cooling —the sensor is faulty.

⚠️ Attention: If the sensor is working, but the refrigerator is not working properly, the problem may be control board or wiring. Check the circuit for breaks and oxidation of contacts.

How to replace the temperature sensor in an Ariston refrigerator

If the sensor is faulty, it needs to be replaced. To do this:

1. Buy analog sensor are suitable with the same characteristics (resistance at +20°C should be the same). For models Ariston sensors marked NTC 5D-9, NTC 10D-11 or Sensata 13G0018.
2. Unplug the refrigerator and remove the back cover (if the sensor is located outside) or the internal panel (if inside the chamber).
3. Disconnect the sensor connector from the control board.
4. Carefully remove the old sensor from the mount (it can be glued or fixed with a plastic clip).
5. Install a new sensor, connect the connector and reassemble the refrigerator in the reverse order.

⚠️ Attention: When replacing the sensor in the freezer do not touch the evaporator tubes with bare hands - this can lead to frostbite or damage to the tubes. Use gloves.

The cost of a new sensor for Ariston varies from 300 to 1500 rubles depending on the model. Original spare parts can be found by article number:

• C00348800 — refrigerator compartment sensor (for series HBM, MBA)
• C00348801 —freezer compartment sensor
• C00348802 —evaporator sensor (No Frost)

Frequent errors when finding and replacing the sensor

When working with temperature sensors Ariston users often make the following mistakes:

• 🔧 The sensors of the refrigerator and freezer compartments are confused.. They may look the same, but have different resistance!
• 🔌 They do not check the connectors on the control boardSometimes the problem is not the same. sensor, but in oxidized contacts.
• ❄️ They forget to defrost the refrigerator before replacing. Ice on the evaporator can interfere with dismantling.
• 📉 Ignore resistance check and change the sensor "by eye", although it could be OK.

Also a common mistake - purchase of an incompatible sensorFor example, a sensor from Indesit or Samsung may not match the resistance, even if it is externally identical. check original spare part article number.

⚠️ Attention: In refrigerators Ariston with a system No Frost after replacing the sensor it may be required resetting errors via the service menu. To do this:

1. Turn off the refrigerator for 10 minutes.
2. Turn on and press the buttons simultaneously Super Cool + Super Freeze (for models with a display).
3. Hold for 5 seconds until a beep appears.

FAQ: Frequently asked questions about Ariston temperature sensors

Can the temperature sensor be repaired or just replaced?

Thermistors and capillary thermostats cannot be repaired —they can only be replaced. Exception: if the problem is break. wiresit can be soldered, but only if the sensor itself is working.

The Ariston refrigerator does not turn off - is the sensor to blame?

Not always. The reasons can be different:

• 🔹 Faulty sensor (shows too high a temperature).
• 🔹 Broken control board.
• 🔹 Leakage freon (the compressor runs non-stop, but does not cool).
• 🔹 Clogged capillary tube.

First check the sensor with a multimeter, then inspect the board for burnt elements.

Which sensor is responsible for the temperature in an Ariston refrigerator with No Frost?

In systems No Frost two sensors are responsible for the temperature in the refrigerator compartment (controls the overall temperature).:

• 📍 Air sensor in the refrigerator compartment (controls the overall temperature).
• ❄️ Evaporator sensor (regulates the operation of the fan and defrost).

If the fan does not work or ice builds up on the back wall, most likely the problem is in the second sensor.

Where to buy an original sensor for Ariston?

Original sensors can be ordered:

• 🛒 In service centers Ariston/Hotpoint.
• 🛒 On spare parts websites: Spare parts for refrigerators, 220-volt, All-Zap.
• 🛒 In electronics stores (for example, Chip and Dip), if you know the exact model of the thermistor.

Cost of the original sensor: 500–1500 rubles. Analogs (for example, from Sensata) may cost less (200–800 rubles).

Is it possible to temporarily operate a refrigerator without a sensor?

❌ No. Without a sensor, the control board will not receive temperature data, and the refrigerator will either:

• 🔹 It will not turn on (if protection is triggered).
• 🔹 It will work continuouslywhich will lead to breakdown of the compressor.

In extreme cases, you can temporarily connect a working sensor from other equipment (with similar resistance), but not for a long time.