I have a furnace (Model: NUGK050CF01) that has recently been experiencing some weird behavior. The furnace will come on (I can see the flames) and it will run for a little over a minute. Then the flames will go out for about 7 minutes, then the cycle repeats itself. The blower is on continuously while all of this happens.
I've done some research and this kind of behavior can be consistent with a dirty flame sensor or if the furnace isn't getting enough airflow. I have checked my air filter and it looks fine. I was unable to located the flame sensor and it looks like my unit does not have one. I've included some pictures.