Gas and Oil Home Heating Furnaces - Heater/Burner Suts Off After 10 Secs

I have a gas furnace with a controller model 50A50-112 (General 90, Inter City Products). It starts up good but the flames and fan shut off after about 9 Secs. The trouble indicator light flashes 6 times yet the code list only goes from 1-5. Can anyone help me troubleshoot the problem?
Thanks,
David

If the inducer fan is what is shutting off, along with the flame, I'd first see if the ~24 VAC current is shutting off. What kind of stat do you have and has it been changed recently?

You can try to temporarily test jumper the heating circuit wires associated with the stat, to see if that starts her up and keeps things going. Jumper the red and white wire terminals down there where the hookup terminals are, in the furnace.

If that keeps the furnace going, something went wrong with the thermostat, or possibly the thermostat wires between furnace and back of stat (even a loose connection). If the jumper test works, and you then know it to be stat or wires or connections, you then can remove the stat and check connections and jumper the red and white wires back there because if it ran then, this would eliminate the thermostat wiring as the problem. It then would have to be the stat or a setting inside the stat.

50A50-112 is "not" a furnace model number, it is a White-Rodgers part, likely the gas valve of this furnace.

Please check the furnace's correct M/N and post it.

General-90 is the marketing name but not the M/N either.