Gas Furnace: G6R, GM
Re: Lockout Codes
| Red Light | Description |
| On | Power On |
| 1 | Limit switch open |
| 2 | Pressure switch stuck open |
| 3 | Pressure switch stuck closed |
| 4 | Ignition Failure |
| 5 | Reversed Polarity |
| Continuous Flash | Flame sensed with no call for heat |
| Yellow Light | Description |
| Continuous Flash | Low Flame Signal |
| On | Flame Sensed |
Replacement furnace control boards: