The above thread is all I could really find; seems to be absolutely no support on the luxaire site for their products. You should call out who did the installation or a 3rd party company to repair it.
Ok, it seems to be that time of year again so bear with me while I swith gears from A/C to heat.
Check the furnace compartment for a manual reset for a flame rollout device or a hi-temp cutout device. Use a Volt/Ohm meter to see if your pressure switch is open. If so, check to see if there are any blockages in the exhaust. Possibly a wasp nest or something of that nature.