Alarm Off error on a Bosch refrigerator: explanation, reasons and how to fix

You opened the refrigerator door Bosch, and the message suddenly lit up on the display «Alarm Off» —and now you don’t understand what this means and how serious the problem is? Don't panic: in 80% of cases, this error can be fixed on your own, without resorting to the help of a wizard. But first you need to figure out what exactly triggered the alarm.

Error Alarm Off (or ALARM with a flashing indicator) is a universal warning for refrigerators Bosch about an emergency situation. It can indicate both minor failures (for example, a door that is not tightly closed) and serious breakdowns (failure of sensors or compressor). In this article we will analyze in detail:

• 🔍 What it means error Alarm Off and how to decipher it based on the refrigerator model
• 🛠️ Step-by-step actions to fix the problem at home
• ⚠️ When you can’t ignore signal and you need to urgently call a technician
• 📊 Error code table for refrigerators Bosch series KGE, KGN, KIV and others

Important: if the error appeared after a power outage, moving, or defrosting, most likely it was a temporary glitch. In other cases, diagnostics will be required. Let's start with the simplest thing - checking the obvious reasons.

What does the “Alarm Off” error mean on a Bosch refrigerator

The inscription «Alarm Off» (or simply ALARM) on the display of refrigerators Bosch is a signal o critical deviation from normal working conditions. Unlike other brands, where errors are coded in letters and numbers (for example, E1, F2), a universal warning is used here, which can mean:

• 🚪 The door is not closed or the seal is damaged (the most common reason - 60% of cases)
• ❄️ Sharp increase in temperature in the chamber (for example, after loading hot products)
• ⚡ Power failure or power surge
• 🔧 Sensor malfunction, compressor or electronic module

In models with a display (for example, Bosch KGE39XW2AR or KGN39XL30R), the error may be accompanied by a flashing temperature indicator or a sound signal. In refrigerators without a screen (series KIV), the red LED lights up ALARM.

💡 How to distinguish a “false alarm” from a serious breakdown? If the error disappears after closing the door or rebooting, the problem is not critical. If Alarm Off it is constantly on, diagnostics is required.

Causes of errors and how to eliminate them

Let's look into them top 5 reasons errors Alarm Off and ways to eliminate them. Start checking from the first point and move along the list - this will save time.

1. A door that is not tightly closed or a damaged seal

This is the most common reason. The refrigerator Bosch fixes the open door for more than 1-2 minutes and turns on the alarm. Check:

• 🧲 Magnetic seal: there are no tears, dirt or deformations. Wipe it with soapy water and dry it.
• 📏 Gaps: place a sheet of paper between the door and the body. If it falls out, the seal is worn out.
• 🪫 Obstacles: make sure that shelves or products are not blocking the closure (for example, a bottle or bag).

🔧 How to fix: If the seal is damaged, it needs to be replaced. For models Bosch original rubber bands with article numbers are suitable 00643430 (for two-chamber) or 00643429 (for single-chamber).

2. A sharp increase in the temperature in the chamber

The refrigerator Bosch may produce Alarm Offif the temperature in the freezer or refrigerator compartment rises above +10°C. This happens due to:

• 🍲 Loading hot foods (soup, roast, boiling water in bottles).
• 🔌 Long shutdown electricity (more than 2 hours).
• 🧊 Incorrect settings mode (for example, SuperCool or SuperFrost off, and the chamber is +25°C).

❄️ Solution: Give the refrigerator 3-4 hours to restore temperature. If the error does not disappear:

1. Check the settings: in the menu Settings → Temperature set -18°C for the freezer and +4°C for the refrigerator.
2. Activate the mode SuperFrost for 6–12 hours (if available).
3. Defrost the refrigerator (if the ice in the freezer is thicker than 5 mm).

3. Power surges or power problems

Refrigerators Bosch are sensitive to voltage surges. If there was a disconnection or surge in the network (for example, below 180V or above 250V), the electronic module may generate an error Alarm Off.

🔌 How to check:

• Make sure that the plug is firmly inserted into the socket.
• Check the voltage in the network with a multimeter (should be 220–240V).
• If there are frequent outages in the house, connect the refrigerator via voltage stabilizer (recommended power - from 300 W).

⚠️ Attention: If the error appeared after a thunderstorm or an accident at a substation, it is possible firmware failure. In this case, flashing the electronic module is required (it is not recommended on your own!).

4. Malfunction of the temperature sensor

If all external causes are excluded, but Alarm Off it is constantly on, the problem may be in the temperature sensor (thermistor). It transmits incorrect data to the control module, and the refrigerator “thinks” that the chamber is too warm.

🔍 Signs of a faulty sensor:

• The error appears even when the door is closed and the temperature is normal.
• The compressor is working without stopping or, conversely, does not turn on.
• The display shows an unreal temperature (for example, -30°C in the refrigerator compartment).

🛠️ What to do: The sensor needs to be checked with a multimeter (resistance at +20°C should be ~5–10 kOhm). If values ​​are out of range, replacement is required. For models Bosch sensors with article numbers are suitable 00643456 (for the freezer) or 00643457 (for the refrigerator).

5. Failure of the electronic module or compressor

If none of the previous methods helped, the reason may lie in:

• 🖥️ Failure of the control board (burnt elements, oxidized contacts).
• ⚙️ Compressor failure (does not start or works with interruptions).
• ❓ Firmware failure (after a power surge or update).

🚨 Signs of a serious breakdown:

• The refrigerator does not cool, but the error Alarm Off is on.
• The display flashes or shows random characters.
• The relay clicks are heard, but the compressor does not start.

⚠️ Attention: If you suspect a module or compressor failure, do not try to repair it yourself - this may lead to a freon leak or short circuit. Contact the service center Bosch or a trusted technician.

Error code table for Bosch refrigerators (KGE series, KGN, KIV)

In some models Bosch the error Alarm Off may be accompanied by additional codes. Below is a breakdown of the most common ones:

📌 If your model refrigerator Bosch gives a different code, check it with operating instructions (section Troubleshooting). In most cases, errors E/F require specialist intervention.

What to do if the "Alarm Off" error does not disappear

If you have checked all possible reasons, but Alarm Off continues to burn, follow the algorithm:

1. Reset settings:

   Disconnect the refrigerator from the network at 10-15 minutes, then turn it on again. In some models (for example, Bosch KAN92VI30R), the reset is performed by holding the button SuperCool + SuperFrost for 5 seconds.

2. Check the power circuit:

   Make sure that the outlet is working (connect another device if the refrigerator). connected via an extension cord - remove it from the circuit.

3. Activate test mode (for advanced users):

   Some models Bosch have a service menu To enter it, press and hold Menu + Temperature Up 10 seconds. In the menu, check the sensor readings (must correspond to the actual temperature).

   How to exit the test mode?

   Press and hold the button Menu 5 seconds or disconnect the refrigerator from the power supply. Do not change the parameters in the service menu if you are not sure about them. value!

4. Contact the service:

   If the error remains, write down exact model of the refrigerator (located on the sticker inside the camera or on the back) and contact an authorized service BoschThe average cost of diagnostics is 1,500–2,500. rubles.

Prevention: how to avoid the “Alarm Off” error in the future

To minimize the risk of an error, follow simple rules:

• 🧴 Caring for the seal: once every 2 months, wash the elastic band with warm water and soap and lubricate it with silicone grease (for example, WD-40 Specialist).
• ⚡ Protection against power surges: use a surge protector or stabilizer (especially in rural location).
• ❄️ Proper loading of food:
  • Do not put hot foods in the refrigerator (let cool to room temperature).
  • Do not overload the shelves (especially in the freezer).
  • Distribute food evenly for good air circulation.
• 🔄 Regular defrosting: even in systems NoFrost carry out general cleaning (unplug, wash, dry) once a year.

📅 Schedule preventive checks:

⚠️ Attention: If your refrigerator Bosch was released before 2015, some recommendations (for example, on firmware) may not be suitable. Check the latest instructions at the official service center.

Frequently asked questions about the “Alarm Off” error on the refrigerator Bosch

🔹 Is it possible to use the refrigerator if “Alarm Off” is on?

If the refrigerator cools normally (the temperature in the chambers is normal), and the error appears periodically, you can use it, but you need to find the reason. If Alarm Off it is on constantly and the temperature is elevated, the food may spoil. In this case, it is better. turn off the refrigerator and call a technician.

🔹 Why does the error appear after defrosting?

Most likely, after defrosting the normal temperature has not been restored. Give the refrigerator 3-4 hours to cool. If the error does not disappear, check:

• The door is closed tightly (possibly, the seal is still wet).
• Temperature settings (possibly lost after switching off).
• Fan operation (in models with NoFrost it should spin).

🔹 How to reset the "Alarm Off" error without disconnecting from network?

In most models Bosch reset is performed as follows:

1. Press and hold the button Alarm Off (or Mute) for 3-5 seconds.
2. If there is no button, simultaneously press SuperCool + SuperFrost for 5 seconds.
3. In refrigerators with touch controls (for example, Bosch KIN86VF30R), swipe your finger across the display left and right.

If the error returns, look deeper for the reason.

🔹 How much does it cost to repair an “Alarm Off” error?

The cost depends on the reason:

• Replacing the seal: 1,500–3,000 rubles (with work).
• Replacement of temperature sensor: 2,000–4,000 rubles.
• Repair of electronic module: 3,500–8,000 rubles.
• Replacement of the compressor: 8,000–15,000 rubles.

💡 Advice: If the refrigerator is under warranty, the repair will be free. Keep the receipt and product passport!

🔹 Can the “Alarm Off” error appear due to a dirty capacitor?

Yes, but extremely rarely. The condenser (radiator on the back wall) becomes clogged with dust, causing heat transfer to deteriorate and the compressor to overheat. Alarm OffThis can occur, but is usually accompanied by other symptoms:

• The refrigerator runs without stopping.
• The case gets very hot at the back.
• A loud hum of the compressor is heard.

Solution: Turn off the refrigerator, vacuum the condenser and wipe it with a damp cloth. Repeat cleaning every six months.