Trane Package Unit: 4YCY
Re: Control Board Lockout / Fault Codes
| Red Light Status | Description |
| Off | No Power or Control Failure |
| On | Normal - No Call for Heat |
| Slow Flash | Normal - Call for Heat |
| 2 | Ignition Failure |
| 3 | Pressure Switch Fault |
| 4 | High Limit Switch or Roll-Out Open |
| 5 | Flame Sensed with Gas Valve Off |
| 6 | Rollout Switch Open |
| 7 | W2 Received Without W1 |