Restoring operation of refrigeration equipment brand Bosch after a full defrosting cycle is a procedure that requires strict adherence to time intervals and sequence of actions. Many owners make the mistake of starting the unit immediately after wiping off the last puddle, which can lead to serious damage to the compressor. The main reason lies in the physics of the operation of the refrigerant and oil, which must take their regular places in the system after a long period of inactivity.
The German engineering school represented by the brand Boschprovides high standards of reliability, however, the sensitivity to improper operation of modern models with inverter compressors is extremely high. Ignoring the rules for initial startup after defrosting often causes the failure of expensive components, the repair of which will require significant financial investments. In this material we will analyze a detailed algorithm of actions.
It is important to understand that the defrosting process changes the temperature and pressure in all circuits of the system. A sudden start to a “hot” or insufficiently prepared system creates extreme stress. That is why there are clear regulations, the violation of which is undesirable for either single-compressor or dual-circuit models.
Physics of the process: why you can’t rush
During defrosting of the refrigerator Bosch the refrigerant circulating in the system is distributed unevenly throughout the entire circuit, and the compressor oil drains into the lower part of the unit or into the heat exchangers. If you turn on the power immediately, the compressor will try to compress the refrigerant gas, causing water hammer. This is mechanical damage to the piston group or valves, which often cannot be repaired.
In addition, electrical components, such as the start relay and thermostats, could cool down or, conversely, heat up during the washing process. They need time to stabilize. Thermal balance must recover naturally so that the sensors correctly read the temperature and send the correct signals to the control unit.
⚠️ Attention: An attempt to start a Bosch refrigerator less than 2 hours after defrosting may void the manufacturer's warranty, since service centers can easily determine the fact water hammer or starting the compressor without oil.
The time required for settling depends on the type of system NoFrost or drip defrosting, as well as on the duration of inactivity. On average, it takes 2 to 4 hours for the pressure to completely stabilize and the oil to drain into the compressor crankcase, but in some cases this period can be extended.
Why does oil escape from the compressor?
During horizontal transportation or prolonged idle time, oil can flow into the evaporator circuit. When started abruptly, the compressor runs “dry”, which leads to rapid wear of the rubbing parts and jamming of the shaft.
Preparatory stage before connection
Before inserting the plug into the socket, it is necessary to conduct a visual and tactile inspection of the internal space and external elements of the refrigerator Bosch. Make sure there is no water inside the chambers. Even a small amount of moisture in the drainage holes can freeze upon first start-up and create an ice plug that interferes with air circulation.
Check the integrity of the rubber seals on the doors. After defrosting and washing, they may have become deformed or shifted. A tight fit of the door is a critical parameter for the correct operation of thermostat and the formation of the correct microclimate inside the chambers.
- 🧹 Thoroughly wipe all shelves and drawers with a dry rag, removing any remaining moisture.
- 🔌 Inspect the power cord for damage, especially if the refrigerator has been washed.
- 🌡️ Make sure that the temperature sensors are not covered by food or packaging.
- 🚪 Check the free movement of the doors and the operation of the magnetic latches.
Pay special attention to the back wall unit. If you defrosted using a hair dryer or other heating devices, make sure that the plastic elements have not melted and the condenser tubes are not deformed. Any mechanical damage can cause freon leakage at the first increase in pressure in the system.
Step-by-step instructions for turning on a Bosch refrigerator
The process of activating the equipment after defrosting should take place in stages. First, make sure that the refrigerator is installed on a flat, horizontal surface. Misalignment can cause improper operation of the oil pump in the compressor and increased noise during operation.
Next, you should connect the device to the power supply. Use only a fixed grounded outlet, avoiding extension cords and tees that may not withstand the starting currents of a powerful motor. Bosch. After connecting the power, do not rush to open the door or load food.
☑️ First start algorithm
The first startup should be idle. This means that the cells must be empty. By loading products at once, you will create a thermal load that the system may not survive during the first hours of operation, when the refrigerant has not yet reached the operating circulation mode. Let the refrigerator operate for 1-2 hours without load.
After the unit has worked for a couple of hours and turns off on its own (you will hear a characteristic click of the relay), you can check the temperature inside the chambers. If everything is normal, a gradual loading of products is allowed, not exceeding 50% of the total volume on the first day.
Setting temperature modes
Modern refrigerators Bosch are equipped with electronic controls, which require correct initial settings. After defrosting, the system can reset the settings to factory settings or go into “demo” mode, so it is important to check the parameters.
For the main refrigeration chamber, the optimal temperature is considered to be in the range from +3 to +5 degrees Celsius. In the freezer, especially if a system is used NoFrost, the temperature should be set at -18 degrees or lower for long-term storage of food.
| Storage area | Recommended temperature | Operating mode | Features |
|---|---|---|---|
| Refrigerator compartment | +4°C | Standard | Optimal for most products |
| Freezer | -18°C | Frozen | Long-term storage of meat and fish |
| Fresh zone | 0°C ... +2°C | VitaFresh | For vegetables and perishable products |
| Super freezing | -24°C | SuperFrost | Only enable when loading fresh products |
It is not recommended to immediately activate the SuperFrost or maximum cooling mode unless there is an urgent need for it. Aggressive operating mode in the first hours after inactivity can lead to overheating of the compressor. Let the system return to mode smoothly.
Operation control and the first signs of malfunctions
On the first day after turning on the refrigerator Bosch it is necessary to periodically monitor its operation. Listen to the sound of the engine: it should be smooth, low and monotonous. The absence of vibrations of the case and extraneous knocks is a good sign.
Pay attention to heat transfer. The side walls or rear grill should heat evenly. If you notice that one part of the cabinet is hot and the other is icy, or the compressor is running continuously without turning off for more than 3-4 hours, this is a cause for concern.
⚠️ Attention: If the refrigerator makes a loud metallic clang, whistle or hum, immediately unplug it. Continued operation may lead to complete destruction of the compressor.
It is also worth checking for condensation formation. In models with a drip system, drops of water should periodically appear on the back wall and flow into the drainage hole. If water flows into the chamber or onto the floor, the drain hole may be clogged and needs to be cleaned.
Typical startup errors
One of the most common mistakes is ignoring the instructions and turning on the device immediately after washing. Owners often forget that moisture may have gotten into electrical contacts or onto the control board. This is fraught with a short circuit.
Another mistake is loading warm food into the refrigerator that has just been turned on. Thermal inertia is large, and the compressor will have to work hard to cool a large amount of heat, which, combined with unstable pressure after inactivity, is critical.
- ❌ Use of aggressive chemicals when washing, the vapors of which could damage plastic parts.
- ❌ Installing the refrigerator close to the wall, which disrupts the ventilation of the condenser.
- ❌ Frequent opening of doors in the first hours of operation, which disrupts the defrosting algorithm.
Remember that proper operation begins with a proper launch. Following simple rules will allow your Bosch to serve the stated 10-15 years without major repairs.
Frequently asked questions (FAQ)
How long exactly should you wait before turning on the Bosch refrigerator?
The minimum waiting time is 2 hours if the refrigerator was standing vertically. If the unit was transported lying down or defrosting took a long time, it is better to wait 4 hours for the oil to completely drain and equalize the pressure.
Is it possible to load products immediately after the first start?
No, it is absolutely not recommended. The refrigerator should run idle for at least 1-2 hours to stabilize the temperature and pressure in the system. Loading warm products will create excess load.
What to do if the refrigerator hums after turning it on?
A slight hum in the first minutes is normal, as the refrigerant begins to circulate. If the noise is strong, metallic or does not subside after 15-20 minutes, turn off the device and contact service.
Do you need to wash the refrigerator before turning it on for the first time after purchase?
Yes, it is advisable to wipe the inner chamber with a damp cloth and a mild detergent to remove factory dust and odors, but after that be sure to let it dry and wait a while before turning on.
Why doesn’t the Bosch refrigerator freeze immediately after turning it on?
The system requires time (from 30 minutes to 2 hours) to reach operating mode. At this time, the compressor builds up pressure and the refrigerant is distributed throughout the circuits. Do not open the door during this period.