Heating between the freezer and refrigerator compartments: normal or broken?

Have you noticed that the side wall or partition between the freezer and refrigerator compartments has become hot? This causes concern for many owners - especially if this has not happened before. In fact heating in this zone can be either an absolutely normal phenomenonand a sign of a serious malfunction. It all depends on refrigerator modelits technical condition and even on time year.

Modern refrigerators with system No Frost or combined cooling systems often have zones of increased heat transfer. But how to distinguish normal operation from a breakdown? In this article we will analyze unique signs by which you can determine whether your refrigerator requires urgent repairs or is it just a design feature. You will learn which temperature readings are considered acceptable and which ones should be alarming, as well as what to do if heating is accompanied by other alarming symptoms.

1. Why does the refrigerator heat up between the chambers: main reasons

Heating of the partition between the freezer and refrigerator compartments is most often associated with work condenser or evaporator. In modern models like Samsung RB37A52 or LG GA-B489YVQZ this zone can heat up to 40-50°C —and this is not always a breakdown. Let's consider the key reasons:

• 🔥 Compressor operation: during active cooling, heat is removed through the side walls, especially in models with a bottom freezer.
• ❄️ Defrosting cycle: in systems No Frost heating occurs during automatic defrosting of the evaporator (every 8-12 hours).
• 🌡️ Thermoregulation: if the temperature in the refrigeration chamber is set to low, the compressor works more intensely, which increases heat transfer.
• 🔌 Electronic components: in inverter models (Bosch KAN92VI30R), the control unit can heat up during prolonged operation.

It is important to distinguish uniform heating (norm) from local overheating (potential problem). For example, if only one point on the partition becomes hot, this may indicate a malfunction of thermal sensor or heating element system No Frost.

2. When is heating between the chambers normal?

In most modern refrigerators, heating the partition to 35-45°C is considered acceptable. This is due to:

1. The design of the cooling system. In models with one compressor (for example, Indesit DF 4180 W) heat from the freezer is transferred through the partition to the refrigeration zone.
2. Fan operation. In systems No Frost fans distribute cold air, and excess heat is removed through the walls.
3. External conditions. In hot weather or high humidity, the compressor runs longer, which increases heat transfer.

To understand whether this is the norm or not, check:

• 📏 Is the entire partition heated evenly or just a part?
• ⏱️ Is the heating constant or appears periodically (for example, while the compressor is running)?
• 🔊 Is heating accompanied by unusual sounds (humming, crackling)?

3. Alarming signs: when heating indicates a breakdown

There are several symptoms for which heating between chambers requires diagnosis:

Critical sign - if heating accompanied refrigerator shutdown (thermal protection is triggered). This may indicate:

• 🔥 Overheating of the compressor due to a faulty start relay
• 💥 Short circuit in the electrical circuit
• 🧊 Freezing of the evaporator in systems No Frost

4. How to check if heating is normal?

To assess the situation yourself, follow these steps:

1. Measure the temperature of the partition with an infrared thermometer (normal: 30-45°C)

2. Check if the freezer is working (should support -18°C)

3. Listen to the sounds of the compressor (uniform hum is normal, knocking/crackling is not)

4. Inspect the rear wall for oil stains (a sign of freon leakage) -->

If you have a model with electronic control (for example, Liebherr CNef 4815), check the error codes on the display:

• E1 - problem with temperature sensor
• E2 — system malfunction No Frost
• E4 — compressor overheating

For models with mechanical control (Atlant MXM 1705) pay attention to:

• 🔄 Compressor switching frequency (norm: 4-8 times per hour)
• ❄️ Ice on the back wall of the refrigerator compartment (a sign of evaporator malfunction)

How to measure the temperature without a thermometer?

Touch the partition with the back of your hand. If you can hold your hand for more than 5 seconds, the temperature is lower 50°C (acceptable). If it burns immediately, the temperature is higher 60°C (requires checking).

5. heating

If the diagnostics showed deviations from the norm, the most likely malfunctions are:

5.1. Malfunction of the thermostat or temperature sensor

Signs:

• 🌡️ The refrigerator works without stopping or, conversely, rarely turns on
• 🔥 The partition is hot, but the chambers are too warm
• ⚡ The temperature indicator flashes on the display

In models Samsung RL38*** this problem is often associated with oxidation of the sensor contacts B Indesit —with failure of the mechanical thermostat.

5.2. Freon leak

Symptoms:

• 🧊 The freezer does not freeze well, but the motor runs constantly
• 🔥 The partition is hot, and the rear grille (condenser) is cold
• 🛢️ Oil stains on the floor under the refrigerator

Leakage most often occurs in places where pipes are soldered or due to corrosion of the evaporator (typical for models older than 10 years).

5.3. Malfunction of the No Frost system

Manifests:

• ❄️ Ice on the back wall of the freezer
• 🔥 Local overheating in the fan area
• 💨 Weak air flow from the ventilation holes

In refrigerators LG with a system Total No Frost this problem is often associated with the failure of the defrost heater.

6. What to do if the partition is too hot?

The algorithm of actions depends on the symptoms:

1. If the heating is uniform and the temperature does not exceed 45°C:
   • 🔄 Reduce the temperature in the refrigerator compartment to +4...+5°C
   • 🌬️ Make sure that the ventilation holes are not blocked by food
   • 🔌 Check whether the refrigerator is standing close to the wall (a gap of 5-10 cm is needed)

If the heating is local (>50°C) or is accompanied by malfunctions:

• ⚡ Disconnect the refrigerator from network
• 📞 Call a technician (indicate the model and symptoms)
• 🚫 Do not try to disassemble the refrigerator yourself (risk of freon leakage or electric shock)

For a temporary solution (if the refrigerator is still working, but gets hotter than usual):

• 🧊 Defrost the refrigerator for 12-24 hours (sometimes it helps with clogged drainage)
• 🧹 Clean the rear grille from dust (use a vacuum cleaner with a narrow nozzle)
• 🔧 Check the door seals (if they are worn, the compressor runs more intense)

7. Prevention of overheating: how to avoid problems

To minimize the risk of overheating:

• 📅 Defrost the refrigerator every 3-6 months (even if it has No Frost)
• 🧴 Lubricate the door seals with silicone grease once a year
• 🌡️ Do not set the temperature lower -20°C in the freezer unless necessary
• ☀️ Avoid placing the refrigerator next to a stove or radiator
• 🔌 Use a surge protector to protect against power surges

For models with electronic control:

• 📱 Update the firmware regularly (relevant for Samsung Family Hub)
• 🔄 Reset settings to factory settings once every 2 years (prevents sensor failures)

In refrigerators with linear compressor (LG Inverter Linearit is important:

• 🚫 Do not overload the freezer (maximum 2/3 of the volume)
• 🍖 Do not store hot foods (even in the “freshness zone”)

FAQ: Frequently asked questions about heating the refrigerator

❓ Why does the new refrigerator have a hot partition, but the old one did not?

Modern models (especially those with inverter compressors) have a more efficient, but also “hotter” cooling system. In older refrigerators ( No Frost and inverter compressors) have a more efficient, but also “hotter” cooling system. In old refrigerators (ZIL, Minsk), heat was dissipated mainly through the rear grill. (Bosch, Liebherr) use the partition as an additional radiator for uniform heat distribution.

❓ Is it possible to reduce heating by covering the partition with thermal insulation?

No! This will disrupt heat transfer and can lead to overheating. compressor. At best, the refrigerator will work less efficiently, at worst, it will fail. If the heating seems excessive, check the cleanliness of the condenser. data-i="230">❓ Why does heating increase at night? ventilation gaps (5-10 cm from the walls) and capacitor cleanliness.

❓ Why does heating increase at night?

This is due to two factors:

1. At night the house is usually warmer (heating works more intensely), so the compressor turns on more often.
2. In the dark there is no natural cooling of the case (there are no drafts from open windows).

If the temperature difference between day and night exceeds 10°C, the compressor will work at its maximum capacity.

❓ Does the partition heat up in Side-by-Side refrigerators?

In models Side-by-Side (Samsung RS68A8840**, LG GC-B247SLUV) heating between chambers is less common, since the freezing and refrigerating zones are separated vertically rather than horizontally. However upper part of the partition (where the control unit is located) can heat up to 30-35°C —this is normal. Heating above 50°C or uneven heat distribution is considered critical.

❓ Can heating be related to the network voltage?

Yes! At reduced voltage (<200V), the compressor works for wear, which increases heat transfer. At elevated levels (>240V), the protection is triggered, but before that the motor has time to overheat. Use voltage stabilizer (especially relevant for dachas and old houses). In refrigerators Atlant i Biryusa this is one of the main reasons for premature wear.

⚠️ Attention: Long-term operation at voltage <190V or >250V can damage the compressor starting relay. Check the voltage in the socket with a multimeter.