Owners of 11-14 conventionals: seriously consider replacing the flame temp sensor every 75k. At the same time, spray carb cleaner or brake cleaner through the burner nozzle for 20-30 seconds. Do not wipe the carbon off of the tip. I have seen that simple move mash carbon into the tiny ports and...
Things that can cause automatic regen problems in 08-10 trucks (which you are experiencing):
Engine injectors have degraded (common)
Intake throttle valve sticking shut (are you also experiencing low power? Also common)
Turbocharger worn out or is passing a ton of oil through it (less common)...
You will eventually need advanced diagnostic software to successfully diagnose the truck. You're only able to see the NOx sensor codes because they communicate directly to the ecu vs the dosing control unit (dcu).
For this particular problem, remove the two bolts holding the little aluminum...
Check for two AC fuses. Don't forget the fuse boxes outside of the truck. After that, the blower motor switch is the most likely (if AUS and US trucks are essentially the same).