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Downtime rarely arrives without warning. These five patterns show up first.
1. Longer wait times at peak
If the same traffic now takes noticeably longer to clear, the controller logic is behind the building’s use.
2. Door faults dominate the service log
Door operators are the highest-wear assembly in any lift. Repeated door callouts usually mean the operator, not the doors, needs replacing.
3. Ride quality has changed
Jerky starts and levelling errors point at drive and brake wear.
4. Spare parts take weeks
Once a controller is out of production, every fault becomes a long outage.
5. Energy use keeps climbing
Older drives waste braking energy that a regenerative drive would feed back.