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Sub-Zero Classic Series (BI) Control Faults | High Voltage System | Bad Micro Communication | Error 90 H 83


  • Error code 90 H 83
  • Classic Series (BI) shows 90 H 83
  • 90 H 83
  • Control faults high-voltage system bad micro communication


  • Communications problems on main board


  1. Turn the home circuit breaker to the unit off for 30 seconds then back on again.
  2. Retest the unit operation.


If these steps do not resolve the issue, no further customer troubleshooting advice is available. Contact Factory Certified Service to schedule an appointment for repair.


Need further assistance? Contact Customer Care at 800.222.7820 or provide your information below and request a Customer Care representative contact you.

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