|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
||Check for flame sensor malfunction or low gas pressure.
|Nine LED flashes
||Igniter circuit issue.