A.O. Smith HVAC Error Codes
Model Families
| Family | Name | Fuel | Models |
|---|---|---|---|
| Cirrex | — | — | 1 |
| EJCT | — | — | 1 |
| ENS/ENT | — | — | 1 |
| GPVL/GPVT | — | — | 1 |
| ProLine | — | — | 1 |
| ProLine Master | — | — | 1 |
| ProLine XE | — | — | 1 |
| ProMax | — | — | 1 |
| Signature Premier | — | — | 1 |
| Voltex | — | — | 1 |
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 |