| Red LED blinks | Meaning |
| 1 | Flame sensor dirty or not properly aligned. |
| 2 | Pressure switch stuck closed. |
| 3 | Pressure switch stuck open. |
| 4 | Limit switch open. |
| 5 | Rollout switch open. |
| 6 | Ignition lockout due to 3 retries. |
| 7 | Flame signal lost 5 times. |
| 8 | Grounding or line polarity fault. |
| 9 | Gas valve circuit shorted. |
| 10 | Extended limit switch open. |
| 11 | Igniter failure. |
| Green LED blinks | Meaning |
| 1 | No call for heat. |
| 2 | Call for heat. |
| 3 | Limit switch open. |
| 4 | Rollout switch open. |
| 5 | Vent and/or combustion air system restricted. |
| 6 | Flame sensing rod needs cleaning. |
Now you know what the issue is, Let’s Go Find Some Easy-Fix Solutions
