| Slow flashing LED light | This means that your furnace is on, but it’s not calling for heat. | This is only an issue if you have raised your thermostat and your furnace doesn’t respond. |
| Rapidly flashing LED light | Means that your furnace is on and is actively calling for heat. | Only beware this if your furnace is continuously calling for heat and isn’t responding to your thermostat. |
| Continuous LED on | Control panel issue. | Replace the control panel. |
| Two LED flashes | System lockout due to lack of flame or reversed polarity. | Check for miswiring, clogged pilot tube, or humidity in the unit. |
| Three LED flashes | Draft pressure error. | Check if the drain tubes are full of moisture or obstructed with dirt. |
| Four LED flashes | The furnace is experiencing an open temperature limit circuit issue. | The issue with thermal protection. |
| Five LED flashes | A flame was sensed within your furnace that shouldn’t be present. | Check for a leaky gas valve, stuck gas valve, or defective flame sensor. |
| Six LED flashes | AC power voltage is too low. | Correct line voltage polarity, check the wiring. |
| Seven LED flashes | An issue with your gas circuit. | Check your unit’s gas valves for the issue. |
| Eight LED flashes | Low Flame. | Check for flame sensor malfunction or low gas pressure. |
| Nine LED flashes | Igniter circuit issue. | Check igniter. |
