Otis · DSD 412 Elevator System
One or more of the three AC line fuses is open. This condition is checked on power-up and can be confirmed upon request through the PCU F#998 PCU Diagnostics function, via measurements on the Armature Interface PCB, A2.
Click steps to track your progress.
Check all AC input fuses for open circuits and replace any blown ones.
Inspect power wiring for problems.
Check for a faulty DSPR power relay.
Use the PCU F#998 PCU Diagnostics function to confirm the fault.