E4
Hitachi
Low Voltage / Power Supply Error
Freezer displays E4 and interior light or alarm behaves erratically
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Unstable mains voltage, Faulty internal power supply circuit on main PCB, Loose power cord connection, Damaged surge components
How to Fix / Troubleshooting
Safety first: Unplug the freezer before inspecting the power cord or control board.
- Check outlet: Plug another appliance into the same outlet to verify stable power. Avoid using extension cords.
- Inspect power cord: Look for cuts, kinks, or burn marks on the Hitachi power cord. Replace if damaged.
- Inspect main control PCB: Look for burnt components in the power supply section (near where the cord connects).
- Use surge protection: After repair, consider using a high-quality surge protector rated for refrigerators.
- Replace main control PCB: If E4 persists and external power is stable, replace the main control PCB.
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Repair Difficulty
Medium
3/5
Required Part
Main Control PCB
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