The refrigerator clicks at night: a dangerous signal or normal operation?

Do you wake up in the middle of the night from rhythmic clicks coming from the kitchen? Or during the day do you notice that the refrigerator periodically makes sharp sounds, similar to a relay switching? Don’t rush to panic - in 80% of cases it is normal operation technicians. But sometimes clicks indicate malfunctions that can lead to compressor failure or freon leakage.

In this article we will analyze in detail:

• 🔍 7 main reasons clicks (from harmless to critical)
• 🛠️ When you can cope on your own, and when you need a master
• 📊 Diagnostic table by the nature of the sound and frequency
• ⚡ Unique features, which distinguish a breakdown from the normal operation of the relay

We will pay special attention to night clicks - why they are heard in silence, and how this relates to the operating modes of modern refrigerators No Frost, Inverter and classic models with a drip system.

1. Normal clicks: how the relay works in the refrigerator

The main cause of clicks is start-protective relaywhich controls the start of the compressor. This small device performs two functions:

• 🔌 Closes/opens compressor power circuit (hence the sound)
• 🛡️ Protects motor from overheating and power surges

In modern refrigerators (for example, Samsung RB30A32N0SA or LG GA-B409SLQZ) the relay is activated every time the compressor is turned on or off. Normal click frequency:

• 🕒 1-2 times per hour — for models with drip system
• 🕓 4–6 times per hour — for No Frost (due to frequent defrosting cycles)
• 🕛 Rare clicks at night —if the refrigerator is operating in economy mode

It may also click thermostat (in models without electronic control, for example, Atlant MHM 1705-80). When the set temperature is reached, it opens the circuit - this is accompanied by a slight click. In inverter refrigerators (Bosch KAN92VI30R) it works instead of a relay electronic controller, but the sound when switching modes can still be heard.

2. Why are clicks heard at night?

At night, the refrigerator seems “louder” for three reasons:

1. Silence in the house. During the day, clicks are masked by household noises (TV, conversations, street noise), and at night even faint sounds can be heard.
2. Temperature change. At night, the air in the kitchen cools, and the refrigerator requires less effort to maintain the mode. The compressor turns on less often, but each start is accompanied by a click of the relay.
3. Eco or Night mode. Many modern models (Liebherr CNef 4315, Electrolux ERN 1400 FO) automatically switch to quiet mode, but in this case the relay may operate more often due to smooth power control.

🔹 Take a test: if clicks are heard only at night, but during the day the refrigerator operates silently - this is normal phenomenon, related to the acoustics of the room. You should contact the service only if clicking sounds are combined with other symptoms (see section 4).

3. 7 reasons for clicks: from harmless to dangerous

We will analyze all possible sources of sound - from standard to those requiring repair.

⚠️ Attention: If clicks are accompanied by burnt smell or smoke —immediately unplug the refrigerator! This is a sign of a short circuit in the relay or compressor winding.

4. How to distinguish a breakdown from normal operation: 5 signs

In order not to confuse normal sounds with malfunctions, check:

Clicks are repeated more often than once every 10 seconds|

The compressor does not start after a click (no hum)|

The temperature in the chambers is above +8°C|

Ice or condensation has appeared on the back wall|

The refrigerator turns off 1-2 seconds after starting-->

🔧 Relay performance test:

1. Unplug the refrigerator for 10 minutes.
2. Plug it back in and listen:
   • ✅ Normal: 1-2 clicks at startup, then silence or a uniform hum.
   • ❌ Failure: Frequent clicks without starting the compressor or with immediate shutdown.

📌 Features of inverter models: they may click more often due to smooth power control. For example, in Samsung RB37J5230SS or Hitachi R-B490P7 the relay is triggered when the compressor speed changes. This is not a breakdown, but a design feature.

5. Self-diagnosis: step-by-step instructions

Before calling a technician, follow these steps:

1. Check the network voltage:

   Use a multimeter or connect another device (for example, a table lamp) to the same outlet. If the light blinks, the problem is in the wiring, not in the refrigerator.

2. Inspect the compressor:

   Remove the back cover (if there is access) and check:

   • 🔌 Contacts relay —there should be no melting or black spots.
   • 🧊 Pipes —ice or oil stains indicate a freon leak.

⚠️ Attention: Do not touch the compressor tubes during operation - they heat up to +90°C! A visual inspection is sufficient for diagnosis.

6. When to call a technician: prices and repair times

You need to contact the service center with the following symptoms:

• 🔌 The relay clicks, but the compressor does not start. → replacement of the relay (1,500–3,000 ₽).
• ❄️ Clicks + ice on the back wall → freon leak (from 3,500 ₽).
• 🔥 Burnt smell or smoke → replacement of the start-up relay or compressor (5,000–15,000 ₽).
• ⚡ Clicking when turning on the light → checking electrical wiring (1,000–2,000 ₽).

📅 Repair time:

• Replacement relay/thermostat - 1 day (if the part is in stock).
• Elimination of freon leaks - 2–3 days (refilling and leak testing required).
• Replacement of the compressor - 3–5 days (system disassembly required).

💡 Saving advice: If the refrigerator is more than 10 years old, compare the cost of repairs with the price of a new one. For example, replacing a compressor in Indesit BIAA 13 (2014) can cost 70% of the cost of a new model.

7. Prevention: how to reduce the noise of a refrigerator

To prevent clicks from disturbing you, follow these recommendations:

• 📍 Installation: The refrigerator should be on a flat surface (check with a level). Adjust the legs to eliminate vibration.
• 🔌 Power supply: Connect via voltage stabilizer (for example, Resanta ASN-1000 N/1-C). This will protect the relay from surges.
• 🧹 Care: Once every 6 months, clean the rear grille from dust - overheating of the compressor increases the load on the relay.
• ❄️ Defrosting: In models with No Frost monitor the condition of the fan. Ice on the blades can cause extraneous sounds.

🔹 For models with an inverter compressor (Panasonic NR-BN30A1, Toshiba GR-RF410WE-PR): use the Eco or Holiday mode (if available). This will reduce the frequency of relay switching.

⚠️ Attention: Do not place the refrigerator close to the wall - at least 5 cm of clearance is needed for air circulation. Overheating leads to increased load on the relay and more frequent clicks.

FAQ: Frequently asked questions about refrigerator clicks

1. refrigerator.
2. Remove the relay (if removable).
3. Test the contacts with a multimeter:
- The resistance between the terminals should be 20–50 Ohms.
- Between the case and the terminals - infinity (no short circuit).