Lennox Gas Furnace: EL195UH
Re: Diagnostic Code / Fault Codes
| Red Light | Description |
| Off | No Power or Control Failure |
| Heartbeat | Power On - Normal Operation |
| 1 | Reverse Line Voltage Polarity |
| 2 | Improper Earth Ground |
| 3 | Burners Failed to Light, Or Flame was Lost |
| 4 | Low Flame Signal |
| 5 | Multiple Failed Ignition Attempts |
| 6 | Not Available |
| 7 | Primary or Secondary Limit Open > 3 min. |
| 8 | Rollout Switch Open |
| 9 | Pressure Switch Open with Inducer On |
| 10 | Pressure Switch Opened 5 Times in a Heat Cycle |
| 11 | Pressure Switch Closed with Inducer Off |
| 12 | Flame Sensed with Gas Valve Off |
| 13 | Low Line Voltage |