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Repair guides, service help, and troubleshooting information regarding Hitachi refrigeration units.

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Why my refrigerator did not stop?

Hi. A few days ago I have a repetitive grid failure. After that my HITACHI R-S37SVUK is undercooling in refrigerator part. Everything is in ice. Seems it did not stop. What part must be replaced?

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An outage occurring from a grid failure usually won’t damage your appliances, but a surge will - and there can be surges associated with outages. Modern fridges have a lot of sensitive controls these days, electronics, etc. so they are very susceptible to even a very small surge, unlike the older, simpler models which were a bit more resilient. Here are some tips that might help resolve the issue:

  • Unplug the refrigerator for at least 10 minutes, then plug it back in.
  • Check the circuit breaker for the refrigerator. If the handle is halfway between on and off, the breaker has tripped.
  • Inspect the refrigerator for signs of electrical damage, particularly along the power cord.
  • Check the control board, which is the most sensitive component in the refrigerator.

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Thank You for response. Now I am checking the control board. Look like that temperature sensors are OK. I suspect that electric dumper was burned out, but the windings of the motor ( I think it is stepper) are not damaged. What else can I check myself?


Here are some further steps you can take:

Check the damper motor and mechanism - The damper controls the airflow between the refrigerator and freezer compartments. If it is stuck open, it could lead to continuous cooling. Inspect the damper motor and mechanism for any binding, damage, or obstructions.

Test the start relay - The start relay provides power to the compressor and fan motors. Use a multimeter to test if it is providing power. If faulty, it could cause continuous running.

Inspect the compressor - Visually check the compressor for signs of damage or leaks. Use a multimeter to test the motor windings for continuity. If damaged, the compressor may run non-stop.

Check the control board voltages - Use a multimeter to test if the control board is providing the correct voltages to components like the thermistors, motors, etc.

Test the thermistors - The thermistors sense temperature. Test them for continuity.

Reset the control board - Unplug the fridge, wait a few minutes, and plug it back in.


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