Defrosting the freezer in a two-chamber refrigerator Bosch: instructions for models with No Frost and drip system

Two-chamber refrigerators Bosch with a system No Frost or drip defrosting are designed for minimal user participation in maintenance, but even they require periodic defrosting of the freezer. Unlike completely defrosting the entire unit, defrosting just the freezer saves time and energy and keeps food in the refrigerator compartment fresh. However, incorrect actions can lead to compressor breakdown, ice formation in the drainage system, or even failure of the electronic control unit.

In this article we will look in detail at how to defrost the freezer compartment in models Bosch (for example KGN39VL30R, KGN36NL32, KGN33NW30 and others) without affecting the refrigerator compartment. We will pay special attention to the nuances for No Frost i Low Frostsystems, and we will also tell you how to avoid typical mistakes that users make when defrosting themselves. If your refrigerator is equipped with a function SuperFreezing or VarioZone, you will find recommendations here for these modes as well.

When you need to defrost the freezer in a Bosch refrigerator

The manufacturer states that models with No Frost not require manual defrosting, but in practice even they require periodic maintenance. Here are the key signs that it’s time to defrost the freezer:

• 🧊 ice more than 5 mm thick appeared on the walls - this worsens heat transfer and increases the load on the compressor.
• ❄️ Door freezers does not close well due to ice on the seal.
• ⚡ Refrigerator turns on more often or works without stopping - a sign of overheating.
• 💧 At the bottom of the chamber water or snow “coat” (relevant for models with Low Frost).
• 📉 Temperature in the freezer rises above -18°C, despite the correct settings.

For refrigerators Bosch with a system No Frost it is recommended to defrost once every 6-12 monthseven if ice is not visually visible in models with a drip system (Low Frost) — every 3-4 months. If you often open the freezer or store a lot of wet foods in it (for example, fresh berries, soups), the interval should be shortened.

⚠️ Attention: If ice forms in the freezer more than once every 2 months, this may indicate a malfunction: clogged drainage, breakdown of the defrosting heating element or a freon leak. In such cases, diagnostics from a service center are required.

Preparation for defrosting: what needs to be done in advance

Proper preparation reduces defrosting time and protects the refrigerator from damage. Follow this algorithm:

1. Disable it. function SuperFreezing. In models Bosch It is indicated by a snowflake with an exclamation mark. If you leave it on, the compressor will work hard, trying to maintain the temperature during defrosting.
2. Take out all the products. Transfer them to a cooler bag, a bowl of cold water, or wrap them in newspaper and place them in a cool place (for example, on a balcony in winter). Do not leave food in the refrigerator compartment next to the freezer - this will speed up their spoilage.
3. Remove all shelves and drawers. You can use them. wash separately in warm water with soda (2 tablespoons per 1 liter). Do not use abrasive detergents - they scratch the plastic.
4. Place a tray to collect water. Put towels or a special tray under the freezer In models with a drainage hole at the bottom (for example, Bosch KGN39XI40) water will flow there - make sure that the hole is not clogged.

If your refrigerator has No Frost fan (it is located on the back wall of the freezer), its blades may be covered with ice. Under no circumstances try to break off the ice with a knife or fork - this will lead to deformation of the blades and disruption of air circulation. For such cases, only natural thawing or a hairdryer is suitable (more on this below).

SuperFreezing mode is turned off|Empty food containers|Warm water and a soft sponge|Towels or absorbent wipes|Hair dryer (optional)|Soda or vinegar for disinfection-->

Step-by-step instructions: how to defrost a Bosch freezer without turning off the refrigerator

The main advantage of two-chamber models Bosch is the ability to turn off only the freezer, leaving the refrigerator compartment to work. Here's how to do it correctly:

Step 1: Turning off the freezer

In most models (for example, KGN36NL32, KGN33NW30the freezer compartment is controlled separately. Find on the control panel:

• Button Freezer (freezer) - hold it for 3-5 seconds until the indicator goes out.
• Or turn the freezer temperature control to position Off or 0.

If an error appears on the display E:01 or F:02, do not be alarmed - this is normal when one of the compartments is turned off. The refrigerator compartment will continue to operate as normal.

Step 2: Acceleration. defrosting

Natural thawing will take 6–12 hours, but the process can be accelerated:

• 🔥 Hair dryer. Set the temperature to the minimum and keep it at a distance of 20–30 cm from the ice. Do not direct hot air at the seal and plastic parts!
• 🍵 Containers with hot water. Place pots or bowls of water on the freezer shelves (temperature no higher than 60°C). Change the water every 15-20 minutes.
• 🧂 Saline solution. Dip a rag in a salt solution (2 tablespoons per 1 liter of water) and wipe the ice build-up - this will speed up the melting.

Prohibited:

• ❌ Use boiling water - this will deform the plastic.
• ❌ Scrape the ice metal objects —damage the evaporator.
• ❌ Place containers with water to the bottom of the freezer —this will block the drainage.

Step 3: Water Removal and Cleaning

When the ice has melted, wipe all surfaces with a dry cloth. Pay special attention to:

• Drainage hole (at the bottom of the back wall) - clean it with a cotton swab.
• Door seal - wash with soapy water and dry.
• Ventilation grilles (in models with No Frost) - dust on them impairs cooling.

For disinfection, use a solution of vinegar (1:1 with water) or special products for refrigerators. Do not use bleach or bleach —they leave a persistent odor.

Step 4: Turning on the freezer

Before turning on:

• Wipe all surfaces dry.
• Make sure that the shelves and drawers are completely dry.
• Close the freezer door and wait 10-15 minutes - this is necessary to stabilize the pressure in system.

Turn on the freezer with the button Freezer or set the temperature to -18°C. After 1–2 hours, check whether the set temperature has been reached. If the refrigerator makes unusual sounds (for example, gurgling or grinding), this may be normal in the first hours after defrosting.

Once every 3 months|Once every 6 months|Only when ice appears|Never defrosted-->

Features of defrosting for different Bosch systems

Defrosting technology depends on the type of system installed in your refrigerator. You can recognize it by the marking on the sticker inside the chamber or in the instructions.

In models with No Frost ice usually accumulates on the fan and evaporator, which are hidden behind the rear panel. If you notice that your freezer has stopped cooling but the fan is running, it's likely that ice is blocking the airflow. In this case:

1. Unplug the refrigerator.
2. Remove the back panel of the freezer (it is secured with latches or screws).
3. Carefully remove the ice from the fan and evaporator with a hairdryer or warm water.
4. Dry the parts and put everything back together.

⚠️ Attention: In refrigerators Bosch with a system No Frost it is strictly forbidden to turn on the freezer if there is ice left on the fan. This will lead to overheating of the motor and its breakdown.

What to do if the freezer does not work after defrosting

Sometimes after defrosting, the freezer refuses to turn on or does not reach the desired temperature. Here are possible reasons and ways to eliminate them:

• 🔌 The refrigerator does not turn on at all:
  • Check whether the door is tightly closed - in some models the lock is activated when the door is open.
  • Make sure that the plug is securely inserted into the socket (sometimes the contacts oxidize after wet cleaning).
  • Try to unplug the refrigerator for 5-10 minutes, then turn it on again - this will reset possible errors in the electronic unit.
• ❄️ The freezer turns on, but does not freeze:
  • Check whether the drainage hole is blocked - if water does not drain, the compressor will work idle.
  • Make sure that the temperature is set to -18°C or lower (in some models the settings are lost after defrosting).
  • Listen to see if the fan is working (in models with No Frost). If not, the ice may not have completely melted.
• 🚨 An error appears on the display (for example, E:01, F:02):
  • Error E:01 - a problem with the temperature sensor. Try turning off the refrigerator for 1 hour, then turning it on again.
  • Error F:02 —fan malfunction. Check if it is blocked by ice or foreign objects.

If after all the manipulations the freezer does not work, the problem is probably:

• Compressor failure (it does not hum and does not heat up).
• Freon leak (the refrigerator works, but does not cool).
• Failure of the control board (all indicators blink or do not respond to pressing).

In these cases, professional repair is required Not. try to disassemble the compressor yourself or solder the tubes - this may aggravate the breakdown.

What to do if an unpleasant odor appears in the freezer after defrosting?

If after defrosting there is a persistent smell in the freezer, the reason may be:

1. Mold in the drainage hole - clean it with a cotton swab, soaked in vinegar.

2. Food residues in hard-to-reach places - check the space under the drawers and behind the seal.

3. Bacteria on plastic parts - wash all removable elements with a soda solution (4 tbsp. spoons per 1 liter of water) and air dry.

4. The smell of new plastic (if the refrigerator is new) - it will disappear in 1-2 weeks.

To eliminate the smell you can use:

- Activated carbon (place in bags on shelves).

- Lemon peels or slices (place for 12 hours).

- Special odor absorbers (for example, Bosch FreshAir).

Do not use air fresheners with a strong aroma - they can be absorbed into the plastic and ruin the taste of the food.

Typical mistakes when defrosting a Bosch freezer

Even experienced users sometimes make mistakes that lead to breakdowns or deterioration of the refrigerator. Here are the most common:

• ❄️ Use of sharp objects to remove ice. This leads to punctures of the evaporator and leakage of freon. In models with No Frost damage to the fan leads to overheating of the motor.
• 🔥 Using hot water or steam. A sudden change in temperature deforms the plastic and can damage electronic components.
• 🚪 Leaving the freezer door open during defrosting. This increases the humidity in the refrigerator compartment and leads to the formation of condensation on its walls.
• ⚡ Turning on the freezer immediately after cleaning. If you do not give time to dry, the moisture will freeze on the evaporator, and ice will form again after a few days.
• 🧼 Use of aggressive chemicals. Chlorine, acetone or abrasive powders destroy the antibacterial coating and seal.

Another common mistake is ignoring the drainage hole. If it is not cleaned, water will accumulate at the bottom of the freezer and then freeze, blocking the operation of the compressor. In models with No Frost this. leads to icing of the fan and cooling stops.

How to extend. time between defrosting

Following simple rules will help reduce the formation of ice and resort to defrosting less often:

• 📦 Pack food correctly. Use cling film, containers with lids or vacuum bags. Store wet foods (soups, berries, greens) in airtight containers.
• 🚪 Minimize the time the door is open. Before opening the freezer, decide what you need so you don't have to keep it open for too long.
• 🌡️ Do not put warm food in the freezer. Wait for them to cool to room temperature. Hot foods increase the load. on the compressor and contribute to the formation of condensation.
• 🔄 Check the seal regularly. If it is dirty or deformed, the freezer will not close properly and ice will begin to accumulate faster. Wipe the seal with a weak soap solution once a month.
• ❄️ Use the mode SuperFreezing only if necessary. Continuous operation in this mode leads to excessive ice formation on the evaporator.

For models with No Frost also important:

• once a month wipe the ventilation grilles from dust (use a soft brush or vacuum cleaner at minimum power).
• Do not cover the ventilation openings products - this interferes with air circulation.

If you live in a region with high humidity, consider installing moisture absorber (for example, silica gel) inside the freezer. This will help reduce the amount of condensation.

FAQ: Frequently asked questions about. defrosting a Bosch freezer

Is it possible to defrost a Bosch freezer without turning off the refrigerator compartment?

Yes, in two-chamber models Bosch the freezer and refrigerator compartments work independently. You can turn off only the freezer with the button Freezer or by setting the temperature to 0, mientras que el compartimento del frigorífico seguirá funcionando con normalidad. However, make sure that your model provides this option - in some budget options, turning off one compartment blocks the other.

How long does defrosting take? Bosch freezers?

Time depends on the thickness of the ice and the method:

• Natural thawing: 6–12 hours (at room temperature 20–25°C).
• With a hairdryer or hot water: 1–3 hours.
• In models with No Frost: 3–6 hours (ice accumulates mainly on the fan).

You can speed up the process, but do not use heat above 60°C, so as not to damage the plastic.

Why doesn’t the Bosch freezer cool after defrosting?

There are several reasons:

1. The fan is blocked (in models with No Frost) - check if there is any ice left on it.
2. Temperature sensor is faulty - the refrigerator “thinks” that the freezer is already cold and does not turn on the compressor.
3. Freon leak —if the compressor works but does not cool, the evaporator tube may be damaged.
4. Board failure controls —reflashing or replacing the module is required.

If after checking the fan and drainage the problem remains, call a technician.

How to defrost a Bosch freezer if ice builds up every week?

Frequent ice formation is a sign of a malfunction. Possible reasons:

• The drainage hole is jammed —the water does not drain and freezes.
• The defrosting heating element does not work (in models with No Frost).
• Problems with the thermostat — the compressor works without stopping, and the moisture does not have time to evaporate.
• Refrigerant leak - the freezer does not cool well, and moisture condenses on the walls.

Temporary solution - defrost more often, but to eliminate the cause, diagnostics are needed at a service center.

Is it possible to use a steam generator to defrost a freezer?

No, steam generator is strictly prohibited to defrost refrigerators Bosch. Hot steam:

• Deforms plastic parts and seals.
• Can damage the electronic control unit (in models with a display).
• Leads to corrosion of metal elements (for example, evaporator).

To speed up defrosting, use a hairdryer at minimum power or a container with warm (not hot!) water.