York Rooftop Unit: ZF
Re: Ignition Lockout Codes
| Light Status | Description |
| Off | No Power |
| On | Control Failure - Replace Control |
| Heartbeat | Normal Operation - No faults |
| 2 Flashes | Pressure switch stuck closed |
| 3 Flashes | Pressure switch failed to close |
| 4 Flashes | Limit switch open |
| 5 Flashes | Flame present with no call for heat |
| 6 Flashes | Ignition failure |