A.O. Smith Error Codes
10 Error Codes
| Code | Description | Severity |
|---|---|---|
| E06 | Flammable Vapor Detection | Critical |
| E1 | Thermistor Failure | Warning |
| E2 | Dry Fire Protection | Warning |
| E3 | Sensor Fault | Warning |
| E4 | High Temperature Cutoff | Critical |
| E5 | Communication Error | Warning |
| ECO | Emergency Cutoff | Critical |
| LOC | Controls Locked | Warning |
| LWR | Lower Element Fault | Warning |
| UPR | Upper Element Fault | Warning |