Now I don't know what kind of escalator model you're working on, but if it's an Kone it probably has a 501 controller, so I'd look at parameter S.03 is Fan control selection
Yes, 501 controller, Kone TransitMaster. I found the parameter list and your are right, S03 is about the fan. There are 3 modes in S03, 0-1-2, do you know what they mean?