| LED blinks | Meaning |
|---|---|
| 1 | Flame sensor dirty or not properly aligned. |
| 2 | Pressure switch stuck open. |
| 3 | Pressure switch stuck closed. |
| 4 | Open limit switch. |
| 5 | Flame sensor sensing flame without a call for heat. |
| 6 | Inducer motor not running. |
| 7 | Low flame signal. |
| 8 | Igniter failure. |
| 9 | Lockout due to excessive ignition retries. |
| 10 | Rollout switch open. |
| 11 | Communication error between furnace and thermostat. |
| 12 | Fan relay failure. |
| 13 | Gas valve failure. |
| 14 | Limit switch open and pressure switch stuck open. |
| 15 | Limit switch open and pressure switch stuck closed. |
| 16 | Limit switch open and flame sensor sensing flame without a call for heat. |
Now you know what the issue is, Let’s Go Find Some Easy-Fix Solutions
