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Well, the NPS is the Neutral Position Switch, so I'd focus on that first... I don't know how the AC being on would matter... the whole code doesn't make a whole lot of sense to me.
yeah... that's what it looked like to me. It was right between two "duh, you screwed up the test" codes, so I figured that's what it should be but I couldn't tell for sure...
Does your A/C work? If it is say low on refridgerant, and the switch was stuck on.. it wouldn't run anyway. Mines dry, wont run if I try. Just a thought.