Exhaust temp sensor

Does this tell stove its to hot or not hot enough. After cleaning stove it ran for about 3 hours and then the fire went out, Restarted normally and this happened again after about 3 hrs. Flashing #3. Had plenty of pellets and when I restarted pellets immediately started falling. I cleaned stove thoroughly and am wondering if I might have damaged the sensor while cleaning the exhaust shaft as stated in my other post (any enviro owners ever try this) stove is running fine since 3am. Can ash cause a false reading.

Problem solved. While cleaning stove I hit the Hi-LO to AUTO-OFF.