Sub-Zero Classic Series (BI) Relay Faults | Defrost System | Open | Error 15 4 00
- Error code 15 4 00
- Classic Series (BI) shows 15 4 00
- 15 4 00
- Defrost relay open
- Defrost relay stuck open
- Turn the home circuit breaker to the unit off for 30 seconds then back on again.
- Retest the unit operation.
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