Honeywell: S8610U
Re: Diagnostic Codes / Fault Codes
| # of Flashes | Description |
| Off | No Call for Heat |
| Fast Flash | Power-up - Internal Check |
| Heartbeat | Normal Operation - Heating |
| 2 | Pilot flame not detected - 5 min retry delay |
| 3 | Flame failed during a run cycle |
| 4 | Flame sensed with no call for pilot |
| 5 | Vent damper fault - failed to open or failed to close |
| 6 | Internal control fault |
| 7 | Flame rod shorted to ground |
| 8 | Low voltage detected |