Sub-Zero Control Lockup / Software Hang

Ice maker produces ice but then shuts off and will not restart until power is cycled.

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

Control board firmware glitch, Electrical noise or surges, Failing control board, Poor grounding

Safety: Disconnect power at the breaker before accessing controls.

Steps:

1. Hard reset: Turn off power for at least 10 minutes, then restore and monitor operation.
2. Check grounding: Ensure the outlet is properly grounded. An electrician can verify and correct wiring.
3. Surge protection: Consider using a surge protector rated for appliances to reduce future control damage.
4. Replace control board: If lockups continue, the main control board may need replacement.

Hard 4/5

Main Control Board

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