Temperaturr goes from 180 to over 500 without thermostat is changed

[ewuerstlin]

Pit Boss PP150PPG – Portable Tabletop Pellet Grill​

Temperature goes from 180 to over 500 without thermostat is changed from 180

 

[Cowboy1955]

Pit Boss PP150PPG – Portable Tabletop Pellet Grill​

Temperature goes from 180 to over 500 without thermostat is changed from 180

How often do you clean the temperature sensor?
I clean mine after every other cook.
If you do keep it clean then you probably have a controller issue
I’d call pitboss support
Hopefully this helps you