| LED blinks | Meaning |
|---|---|
| 1 | No signal from thermostat. |
| 2 | Furnace lockout due to excessive number of ignition retries (3). |
| 3 | Pressure switch open. |
| 4 | Pressure switch closed. |
| 5 | Flame sensor sensing flame without a call for heat. |
| 6 | Flame sensor not sensing flame. |
| 7 | Continuous LED flashing. |
Now you know what the issue is, Let’s Go Find Some Easy-Fix Solutions
