Idk what it means but my trusty echo PAS 225 that has been serving me at least decent for a decade now needing a couple cheap carb replacements(prolly why it doesn't run perfect) today just stopped turning on and after yanking on it and spraying carb cleaner here there and everywhere the final truck was to yank on it with CHOKE OPEN and throttle depressed. I WAS trying with throttle closed.