Sub-Zero No Cooling – Control or Power Supply Failure

Wine cooler not cooling at all; interior is warm, lights may work, but compressor and fans are not running.

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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 breaker or no power to outlet, Failed main control board, Faulty compressor start device, Open thermal overload on compressor

How to Fix / Troubleshooting

Safety first: Before any internal work, unplug the unit or switch off the breaker. Do not bypass safety devices.

Step 1 – Verify power

  • Check that the outlet has power by plugging in another device.
  • Reset any tripped breakers or GFCI outlets.

Step 2 – Check control settings

  • Ensure the unit is not in Sabbath or showroom/demo mode.
  • Confirm the temperature is not set to OFF or the warmest setting.

Step 3 – Listen for compressor and fans

  • With power on, listen at the back or bottom for compressor hum or fan noise.
  • If completely silent, suspect control board or power supply issues.

Step 4 – Inspect control board

  • Disconnect power and remove the control access panel.
  • Look for burnt components or loose connectors.
  • Reseat all harnesses and restore power to test.

Step 5 – Compressor start device

  • If you hear periodic clicking but no sustained compressor run, the start device may be faulty; see EC30 procedure for replacement.

When to call a technician: If basic checks do not restore cooling, professional diagnosis of the control and sealed system is required.

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Repair Difficulty

Hard 4/5

Required Part

Main Control Board
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