Owners of Japanese household appliances are often faced with a dilemma: does their unit really require periodic disconnection from the network to remove ice crust. The brand's models Hitachi are famous for their advanced cooling systems, but even they require competent maintenance to preserve their service life. Incorrect actions when trying to get rid of ice can lead to damage to internal circuits or failure of electronics.
Before taking active steps, you must clearly determine the type of cooling system of your device. The algorithm of your next steps and the frequency of the procedure directly depend on this. In this article, we will analyze in detail the nuances of servicing various modifications and eliminate common misconceptions.
Determining the type of cooling system
The first step will be to study the technical documentation or inspect the internal structure of the cameras. Most modern models are equipped with a system that automatically removes moisture. In such units, the evaporator is hidden behind a plastic panel, and air circulation is forced through special channels. Hitachi equipped with a system No Frost, which implies automatic removal of moisture. In such units, the evaporator is hidden behind a plastic panel, and air circulation is forced through special channels.
If you are the owner of a classic model with a drip system or combined cooling, the approach will be different. In devices with an open evaporator on the back wall, ice builds up naturally and requires mechanical or natural removal. It is a mistake to believe that the presence of the “automatic defrosting” function completely frees the owner from the need for control.
To accurately determine the type of system, pay attention to the following signs:
- 🧊 The presence of a visible open evaporator (grid) on the back wall of the refrigerator compartment.
- 💨 The presence of a fan that can be heard when the compressor is operating.
- 📜 Marking on the nameplate: the presence of the abbreviation No Frost or Full No Frost.
⚠️ Attention: An attempt to artificially speed up defrosting in No Frost models unless absolutely necessary can disrupt the calibration of the defrost sensors, which will lead to incorrect operation of the thermostat.
When defrosting is really needed
Many users mistakenly believe that equipment Hitachi needs to be “defrosted” for the sake of the procedure itself. In fact, full automation systems only require intervention in emergency situations or during routine hygienic treatment. An ice coat should not form in a working unit.
The main reasons for forced shutdown are the breakdown of the defrost system, when the drainage hole becomes clogged and water begins to flow onto the shelves, forming ice blocks. Defrosting is also necessary before transportation or moving to prevent damage to the condenser tubes by liquid refrigerant or oil.
You should pay attention to the following symptoms that require immediate intervention:
- ❄️ A noticeable decrease in the efficiency of cooling products when the compressor is running.
- 💧 The appearance of puddles of water at the bottom of the refrigerator or freezer compartment.
- 🔊 The appearance of an extraneous hum or crackling sound that was not there before.
If you notice that the door no longer closes tightly due to ice on the seal, this is also a signal to action. In such cases, ignoring the problem leads to increased energy consumption and wear of the motor.
Preparation for the defrosting procedure
The preparation process requires care and adherence to the sequence of actions. First you need to empty the chambers of food. If it is winter outside, you can take the contents to the balcony, otherwise use thermal bags or ice packs for temporary storage.
Next, you should disconnect the unit from the power supply. To do this, remove the plug from the outlet—this is a critical safety step. Do not try to defrost the device when it is turned on, as this will create an extra load on the compressor, which will try to compensate for the heat coming from outside.
After turning off, remove all removable elements:
- 🥣 Glass shelves and plastic containers.
- 🧺 Drawers for vegetables and fruits from the bottom zones.
- 🧊 Ice trays and freezing molds.
☑️ Preparation checklist
Cover the floor around with rags or towels, since the volume of melting water can be significant, especially if the ice crust was thick. Prepare a container in advance to collect liquid if the design of the model does not provide for drainage of water into a special tray.
Step-by-step defrosting process
The safest and recommended by the manufacturer Hitachi method is natural defrosting. Leave cell doors open for long periods of time. For a full freezer model, this process may take from 10 to 24 hours depending on the thickness of the ice and the room temperature.
It is strictly forbidden to use sharp objects such as knives or screwdrivers to chip the ice. Mechanical impact can damage the thin evaporator tubes in which the refrigerantcirculates. Repairing such damage is often not economically feasible and requires calling a specialist with expensive equipment.
To speed up the process, you can use the following safe methods:
- 🪣 Installing hot water containers on shelves (placing a towel).
- 🌬️ Using a fan directed inside the open chamber.
- 🧴 Using a special defrosting spray (certified only).
⚠️ Attention: The use of hair dryers or heaters at close range is prohibited. A sharp temperature change can cause cracking of the plastic, deformation of the seals and damage to the electronic control board.
Why can’t you heat it with a hairdryer?
Sudden heating of the plastic leads to its deformation, which is not reversible. In addition, hot air can melt the insulation of the wires, causing a short circuit the next time you turn it on. Also, steam from the hair dryer settles on the internal parts and freezes in hard-to-reach places, aggravating the problem in the future.
Caring for the drainage system
During defrosting, ideal access to the drainage hole opens, which often causes the formation of ice. It is located on the back wall of the refrigerator compartment. It is through it that the condensate should flow into the evaporator.
If you notice that the water is standing in the groove or does not drain, it means that the channel is clogged with food debris or mold. To clean, use a special brush or soft wire with cotton wool at the end. Carefully push through the blockage and rinse the channel with warm water.
The effectiveness of cleaning can be assessed using the table of symptoms:
| Symptom | Probable cause | Action |
|---|---|---|
| Water at the bottom of the chamber | Clogged drainage | Clean the channel with a brush |
| Ice at the entrance to the channel | Freezing of moisture in the tube | Blow out syringe with warm water |
| Unpleasant odor | Bacterial proliferation in the drain | Treat with a solution of soda or vinegar |
| Water flows along the wall | Displacement groove | Correct the position or call a technician |
After mechanical cleaning, it is recommended to rinse the system with a weak solution of baking soda for disinfection. This will prevent the appearance of mold and unpleasant odors in the future.
Completing the procedure and starting
After all the ice has melted and the water has been removed, you must thoroughly wipe the internal surfaces with a dry soft cloth. Make sure there is no moisture left in the recesses and corners. Wet rubber seals should also be wiped dry to prevent the development of fungus.
Assemble the unit in reverse order: install shelves, drawers and containers. Keep the doors closed for now. Before connecting to the network, let the device stand in a warm room (if it was in the cold) for at least 2-3 hours. This is necessary to equalize the oil temperature in the compressor.
Turn on the power and adjust the temperature mode. Empty chambers may require 2 to 4 hours to cool down initially. Do not load the products immediately - let the equipment return to operating mode.
Frequent errors during maintenance
Inexperienced users often make mistakes that shorten the service life technology Hitachi. One of the main ones is to try to speed up the process by pouring boiling water directly onto the ice block. Thermal shock can lead to cracks in the plastic and metal casing of the evaporator.
Another common mistake is turning on the device immediately after the ice has melted without wiping the floor dry. Water may flow under the housing and onto electrical components, causing a short circuit. It is also dangerous to leave the door open in a draft if dusty work is being done in the room.
Avoid using aggressive chemicals to remove ice. Chlorine-containing products can damage chamber linings and leave toxic residues that can then leach into food. For washing, use only mild detergents intended for contact with food.
Frequently asked questions (FAQ)
Do I need defrost a Hitachi No Frost refrigerator?
In normal mode, there is no need to defrost the No Frost system, as it does it automatically. The exception is general cleaning once a year or emergency situations with ice formation.
How long does complete defrosting take?
The time depends on the thickness of the ice and the temperature in the room. The process usually takes from 8 to 24 hours. Do not rush the process with artificial heating.
Is it possible to use a knife to remove ice?
Absolutely not. The tip of the knife easily pierces the thin tubes of the evaporator, which leads to a freon leak and expensive repairs by a technician.
What to do if the refrigerator does not freeze after defrosting?
Check whether the doors are tightly closed and whether the shelves are installed correctly. If after 4-5 hours of operation the temperature does not drop, the system may have been damaged during defrosting and diagnostics are required.
How often should you clean a Hitachi refrigerator?
It is recommended to carry out hygienic cleaning with unplugging at least once every 6-12 months, even if there is no visible ice.