Sub-Zero No Power / Control Board or Supply Failure

Refrigerator does not power on at all; display is blank and no lights or fans run.

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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

Tripped circuit breaker, Loose power cord connection, Failed main control board, Open internal thermal fuse

How to Fix / Troubleshooting

Safety first: Use caution when working with household electrical circuits. If unsure, consult an electrician.

Step 1 – Check power source

  • Verify the outlet has power by plugging in another device.
  • Check the circuit breaker or fuse panel and reset if tripped.

Step 2 – Inspect power cord

  • Ensure the refrigerator’s power cord is fully inserted and not damaged.

Step 3 – Access main control board

  • Unplug the unit and access the main control board.
  • Look for blown fuses on the board (if present) or obvious burn damage.

Step 4 – Replace control board if failed

  • If the board shows damage or does not supply low‑voltage power to the UI, it likely needs replacement by a technician.
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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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