My Pelpro pp60 just quit feeding pellets last night, would the auger motor just suddenly quit with no warning? or did the pressure switch fail?

There are a few possible causes for this issue with your pellet stove. One possibility is that there is an issue with the auger feeding the pellets into the burn pot. The auger could be clogged, or the timing of the auger may need to be adjusted. Another possibility is that there is an issue with the airflow in the stove, which is preventing the fire from maintaining a consistent flame. The air intake or exhaust vents could be blocked, or the blower fan could be malfunctioning. Additionally, the control board of the stove could be malfunctioning, causing the auger and blower to cycle on and off erratically. It may be best to consult with a professional technician to diagnose and fix the issue with your pellet stove.

read here to find out more https://www.manualslib.com/manual/916663/Pelpro-Pp60.html?page=20 this video may help

Have you checked to see that the auger is not blocked? Or the pellet hopper is not blocked ? if the auger is turning then it has to be that something is blocking the pellets from getting in to it.

Are the pellets getting stuck or jammed in the auger? Take a look at this website and perhaps it will give you some ideas to look at:
http://www.pelletstovefires.com/pellet-stove-problems.html

How to Repair a Pellet Stove Auger That Won't Turn ' Home ...

homeguides.sfgate.com > Outdoors > General Repair

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vacuum switch helps all to work and power supply if more than 2 bends in the exhaust can b a problem to there is a intake air lever on the back of some that allow more or less vac pressure in to the chamber auger will not turn if door is open to create the vacume

hmm, could be low power to the motor, heavier power cord, or it's possible the auger needs new bushing/bearings, wiggle the auger to see if it has any play in it OR it's fussy about the size of pellets it made to feed. please send pictures and or results.
Jay

Take it back and replace if not working properly. Why go crazy. U paid with good money - you are entitled to a good working product.

Several of things come to mind: Have you changed the type (Brand) of pellets, recently?
Have you had your chimney (stack) cleaned in the past year? Is the fresh air intake functioning properly? Is the auger feeding to much or to little pellets?

Changing brand of pellets - Not all wood pellets are made the same. If you recently changed brands, you will need to tweak your stove to handle this new brand. This will affect how the auger feeds.

If you chimney (stack) hasn't been cleaned in the past 12 months, it may be partially clogged with creosote and not drawing properly and it is liquefying and running back down the chimney and not allowing for a clean burn. And could cause a chimney fire.

Fresh air intake: If that's not functioning properly, you're getting incomplete combustion. Which will cause the black tar looking substance you described. Couple that with changing brands of pellets and you have a problem.

The above are the first things that came to mind. I hope it steers you in the right direction to troubleshoot the problem. Please let me know.