Hitachi Inconsistent Temperature Control

Freezer interior temperature fluctuates widely, causing soft and hard spots

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.

Possible Causes

Faulty thermistor, Intermittent fan operation, Blocked air vents, Control PCB algorithm issues

Safety first: Unplug the freezer before working inside.

Check air vents: Ensure vents are not blocked by food packages.
Verify fan operation: Confirm the evaporator fan runs whenever the compressor is on.
Test thermistor: Replace the Hitachi freezer thermistor if resistance readings are unstable.
Control PCB: If hardware is good but fluctuations persist, the main control PCB may need replacement.

Medium 3/5

Freezer Thermistor

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