Came to a job to do new rack chains. Escalator runs both directions in normal operation and down on inspection, but won't run up on inspection. Makes an attempt (kinda) then contractors drop out. No faults are being registered and I have zero experience with this model. Service tech said he's never had an issue on inspection before, but we've only had this job for a little over a year, so not sure how many times he's tried it. Can't even find the inspection circuit in the prints and they are pretty basic.
Any ideas?
