Why does the Bosch refrigerator click: is it normal or a signal of a breakdown?

The refrigerator Bosch is a symbol of German reliability, but even it sometimes begins to make suspicious sounds. Clicks, crackles, occasional clatters: owners are often frightened when they hear them for the first time. In fact, most sounds this is normal operation of the system, but in 15-20% of cases they signal malfunctions that cannot be ignored.

In this article we will analyze all possible causes of clicking - from harmless to critical. You will learn how to distinguish the normal sound of the relay from a compressor failure, why the refrigerator clicks when turned on or off, and what to do if the clicks are accompanied by other symptoms (does not cool, the light blinks, the case gets hot). And also - step-by-step instructions for self-diagnosis and advice on when to call a specialist.

⚠️ Important: if your refrigerator Bosch not just clicks, but also does not turn on after 3-5 attempts to start the compressor, this may indicate an interturn short circuit of the windings - one of the most expensive breakdowns. In this case, independent repair is not recommended.

1. Normal clicks: how a Bosch refrigerator works

Any refrigerator is a complex system with mechanical and electronic components. Clicks can come from:

• 🔌 Compressor start relay —the most common occurrence. When the engine starts, the relay closes its contacts with a characteristic click, and when it stops, it opens. In models Bosch Serie 4 i Serie 6 this relay is often located next to the compressor in the lower part.
• ❄️ Thermostat (in mechanical models). When the set temperature is reached, the thermostat contacts open with a click. In electronic refrigerators (Bosch KIN86AF30R, KAN92VI30R), the role of a thermostat is performed by a sensor, but the sound can be produced by a control relay.
• 🧊 NoFrost systems. The fan and defrost timer in models with NoFrost (for example, Bosch KGN39XL35R) periodically turn on/off, which is accompanied by light clicks.

How to distinguish a normal click from a breakdown?

✅ Normal: the sound is one-time, repeated at intervals of 10-30 minutes (compressor operating cycle), not accompanied by other symptoms (heating, vibration, errors on the display).

❌ Problem: frequent clicks (once every 1-2 seconds), the compressor does not start, the refrigerator does not freeze, errors are displayed on the panel (for example E01, E24).

2. Clicks when turned on: why the Bosch refrigerator does not start

If the refrigerator clicks, but does not start working hums, the light inside is on), the problem lies in one of three nodes:

1. Start relay —the most vulnerable element. Over time, its contacts burn out, and the relay “sticks” in the open state: there is a click, but the compressor does not start, after 2-3 minutes the attempt is repeated.
2. Compressor. If the motor windings are shorted or burned out, the relay clicks, but no current flows. In this case, the compressor housing may be hot.
3. Thermal protection (in models with Bosch SuperCooling). When it overheats, it opens the circuit, and the refrigerator is “silent” until it cools down.

🔧 How to check it yourself?

Unplug the refrigerator for 10 minutes, then turn it on again. If after 3-4 clicks the compressor does not start, there is a problem. in the relay or compressor. Do not try to start the refrigerator repeatedly: this can lead to burnout of the motor windings.

Disconnect the refrigerator from the mains for 10 minutes|Listen to whether the compressor hums after the click|Check whether the compressor housing is hot (careful - do not get burned!)|Inspect the start relay for melting or burning smell|Ring the compressor with a multimeter (if you have the skills)

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3. Frequent clicks: when it is dangerous

If the refrigerator Bosch clicks every 1-3 seconds, this is an alarming signal:

⚠️ Attention: if clicks are accompanied burning smell, immediately disconnect the refrigerator from the network! This may indicate a short circuit in the compressor windings or melting of the relay contacts. Further operation is dangerous.

What will happen if you ignore frequent occurrences. clicks?

If the cause is not eliminated, the compressor may completely fail (replacement cost - from 8000 ₽). In the worst case, a short circuit and fire. It is especially dangerous to ignore clicks with a burning smell or smoke.

4. Clicks in Bosch refrigerators with NoFrost. data-i="126">Models with the system

Models with system NoFrost (for example, Bosch KAN92VI30R, KGN39XL42R) have additional sources of clicks:

• ⏱️ Defrost timer. Every 8-12 hours it turns on the heater to remove frost. A click is heard when the timer is switched.
• 🌀 Fan. When changing the rotation speed (for example, when opening the door), it may make light clicks.
• 🔄 Air duct damper. In two-chamber models, it regulates the flow of cold air between the compartments.

🔍 How to distinguish a normal sound from a breakdown?

Normally, clicks in NoFrost:

• They are repeated at long intervals (once every few hours).
• They are not accompanied by the fan stopping or icing of the back wall.
• Does not affect the temperature in the chambers.

🚨 Alarming signs:

• Clicks every 10-20 seconds + fan does not spin → defrost timer is faulty.
• Clicks + ice on the back wall → the heater or defrost sensor is broken.
• Clicks + error E24 on the display → problem with the system NoFrost.

5. Clicking when opening the door: why does this happen

If the refrigerator clicks exactly when opening or closing door, the reasons may be as follows:

1. Light switch. When you press the button (or magnetic contact), a click is heard. This is normal if the sound is one-time and does not repeat.
2. Door opening sensor (in models with a display, for example, Bosch KIN86AF30R). triggered.
3. Depressurization of the seal. If the door does not close tightly, the compressor turns on more often, which is accompanied by relay clicks.
4. Problems with the fan (in NoFrost). When you open the door, it stops, and when you close it starts with a click.

🛠️ What to do?

Perform a simple test:

1. Open the door and listen: there should be a click. single (light switch).
2. Close the door and check if it fits tightly. If the seal is worn out, replace it (cost ~2000-3500 ₽).
3. In models with NoFrost after closing the door, the fan should start in 1-2 minutes. If the clicks are repeated longer, there may be a malfunction.

6. Clicks and errors on the display: decoding codes

If clicks are accompanied flashing indicators or errors on the display, this significantly narrows the range of possible problems. Let's look at the most common error codes in refrigerators Bosch:

⚠️ Attention: if an error appears on the display F02 or E01, and the refrigerator clicks every 2-3 seconds, do not try to reset the error by repeatedly turning it on/off. This may cause the compressor to burn out. It is better to turn off the refrigerator once for 10 minutes, and if the error appears again, call a technician.

7. When to call a technician: 5 signs of a serious breakdown

Not all clicks require professional repair, but there are symptoms in which independent intervention is dangerous:

• 🔥 Smell of burning or smoke from the back of the refrigerator → short circuit.
• ⚡ Sparks or crackling when clicking → problem with electrical wiring.
• ❄️ The compressor does not start after 5 attempts (clicks repeat every 2-3 minutes).
• 📉 The temperature in the chambers has risen above +10°C, despite the relay clicks.
• 💥 The refrigerator turns off 5-10 seconds after starting (thermal protection is triggered).

💰 Repair cost:

• Replacement of the start relay: 1500–2500 ₽.
• Replacement of the compressor: 8000–15000 ₽ (depending on the model).
• Repair of the control board: 3000–6000 ₽.
• Replacement of the timer defrost (NoFrost): 2000–3500 ₽.

📞 How to choose a technician?

Contact authorized service centers Boschor specialists with experience working with this particular brand. Check if they provide a guarantee for repairs (standard - 6-12 months). If the refrigerator is under warranty, do not open it yourself —this will void the warranty.

FAQ: Frequently asked questions about clicks in Bosch refrigerators

❓ The Bosch refrigerator clicks, but does not turn on. What should you do first?

Unplug the refrigerator for 10 minutes, then turn it on again. the compressor did not start:

1. Check whether the compressor housing is hot (if so, overheating is possible).
2. Inspect the starting relay for melting or a burning smell.
3. If you do not have the skills, call a technician Replacing the relay yourself is possible, but requires. accuracy.

⚠️ Do not try to start the refrigerator multiple times in a row - this may burn the compressor windings.

❓ Is it normal for a new Bosch refrigerator to click when first turned on?

Yes, this is normal during the first hours of operation:

• The compressor starts more often to reach the desired temperature.
• The relay and thermostat are calibrated, which may be accompanied by clicks.
• In models with NoFrost the defrost system is turned on.

If after 12-24 hours the clicks have not become less frequent, check whether the refrigerator is installed correctly (the distance to the wall is at least 5 cm for ventilation).

❓ Why does the Bosch refrigerator click when unplugged?

It could be:

• The residual current in the capacitors (light click when discharged).
• Thermostat (in mechanical models) returns to its original position.
• Protection relay triggered in case of a sudden shutdown.

If the sound is one-time, it is not dangerous. If the clicks are repeated after switching off, the control board may be faulty.

❓ Is it possible to replace the start relay in a Bosch refrigerator yourself?

Yes, if you have basic skills in working with electrical equipment:

1. Unplug the refrigerator.
2. Remove the back cover (at the bottom).
3. Disconnect the wires from the relay (take a photo of their location!).
4. Unscrew the relay and install a new one (the model must match!).
5. Connect the wires, close the lid, turn on the refrigerator.

⚠️ Attention: if after replacing the relay the compressor does not start, the problem may be in the motor itself. Further diagnostics require special equipment.

❓ Clicking noises in the Bosch refrigerator. intensify at night. Why?

Probable reasons:

• 🌙 Silence in the house — during the day, clicks are drowned out by household noises.
• 📉 Voltage drop in the network at night can cause frequent relay operation.
• ❄️ The defrost cycle NoFrost often occurs at night.

If clicks at night are accompanied by additional symptoms (heating, vibration, errors), check the voltage in the socket (should be 220-230 V).