Sub-Zero Classic Series (BI) Control Faults | Invalid E2 Checksum | Error 90 0 74
- Error code 90 0 74
- Classic Series (BI) shows 90 0 74
- 90 0 74
- Control fault miscellaneous invalid E2 checksum
- Flash failure
- Turn the home circuit breaker to the unit off for 30 seconds then back on again.
- Retest the unit operation.
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