Its most likely springtrap causing both the errors and the phantoms

I think it’s the other way around, the ventilation system is very faulty and the bad airflow causes you to see phantoms

WWF tells us that Springtrap himself can cause hallucinations

Oh, I forgot that, you’re right. But it still doesn’t mean that the phantoms cause the ventilation errors

I think that the night gard hallucinats due to trauma at the fnaf 2 location and gets jump scared by them and bumps a machine that controls what broke