Goodman Gas Furnace: GMS8/GMS9 OR GCS8/GCS9
Re: Lockout Codes
| # of Flashes | Description |
| Off | No Power or Faulty Control |
| On | Normal Operation |
| 1 | Ignition lockout (3 failed tries) - 1hr Auto Reset |
| 2 | Pressure switch stuck closed |
| 3 | Pressure switch stuck open |
| 4 | Limit switch open (auto reset) |
| 5 | Flame present with gas valve off |
| 6 | Rollout switch open or Low Voltage fuse blown |
| 7 | Low flame signal |
| Rapid Flash | Reversed polarity |