ThyssenKrupp Elevator Fault Codes - Service Troubleshooting Reference
ThyssenKrupp elevators (Evolution, Synergy, MRL, Endura, and custom traction systems) use computerized controls that log fault codes accessible via the technician’s service tool or keypad.
Use this guide to document symptoms and decide how urgent the service call is. It is not a bypass, reset, or pit-access procedure for building staff.
| Fault | Meaning | Service Focus |
|---|---|---|
| Safety Circuit Open | Door, safety shoe, or limit switch open | Door contacts and safety chain |
| Door Fault | Door not closing or opening within time | Door motor, operator, and contacts |
| Overspeed | Car exceeded rated speed | Governor, brake, and speed feedback |
| Drive Fault | VFD or drive system fault | Drive fault history and power quality |
| Motor Overtemperature | Motor thermal protection tripped | Cooling, load, and brake drag checks |
| Encoder Fault | Speed feedback error | Encoder wiring and position feedback |
| Leveling Fault | Car not leveling at floor | Floor sensors, vanes, and brake state |
| Buffer Contact | Pit buffer switch triggered | Pit buffer and safety circuit |
| Governor Switch | Centrifugal governor tripped | Governor and overspeed circuit |
| Emergency Stop | Emergency stop button pressed | Stop circuit and reset cause |
Safe Troubleshooting Checklist
Before calling the elevator contractor, record the displayed fault, car number, floor, car position, door position, passenger status, recent outage or maintenance event, and any visible controller message. Keep the landing secure and keep the car out of service if the fault involves doors, brakes, overspeed, governor, buffer, pit stop, car-top stop, leveling, or drive control.
Do not bypass door locks, governor circuits, brake monitors, pit switches, car-top switches, terminal limits, or safety-chain wiring to clear a fault. Those circuits protect passengers and technicians.
Most Common Faults
Safety Circuit Open
The elevator safety circuit is a series chain of normally-closed contacts: door contacts, gate switches, terminal limit switches, governor switch, pit stop switch, and others. When any contact opens, the elevator stops immediately. Use the service tool to read which safety input is open. Door contacts and gate switches are common first checks, but the car should stay out of service until the open input is verified.
Door Fault
A door that doesn’t close within the preset time (typically 5–15 seconds) triggers a door fault. Check the door operator for mechanical obstructions, verify the door motor coupling, and check the door close limit switch. On ThyssenKrupp systems with TWIN door operators, also check the door reversing device (light curtain or safety edge).
Drive Fault
ThyssenKrupp MRL and traction systems use variable frequency drives (typically KEB, Vacon, or proprietary drives). A drive fault from the elevator’s main controller should be supplemented by reading the drive’s own fault code directly at the drive keypad. Common drive faults: overvoltage on deceleration (check brake resistor), overcurrent (check motor and encoder), and communication fault (check CAN or serial link).
Leveling Fault
If the elevator car doesn’t reach exact floor level within tolerance, a leveling fault prevents door opening. Check the landing zone vanes and magnetic sensors at each floor. Bent vanes or shifted sensors cause false floor detection.
Parts Often Needed
| Part | Notes |
|---|---|
| Door contact (mechanical) | Replace when worn |
| Door operator belt/coupling | Replace on door fault |
| Encoder | Replace on feedback fault |
| Brake coil | Replace on drag or release fault |
| Drive module | Replace on repeated drive faults |
Service Parts and Support
ThyssenKrupp elevator door, brake, drive, encoder, governor, and controller parts should be sourced through the building’s elevator contractor or the OEM service channel. Record the lift model, controller display, fault history, and car position before requesting parts or service.
When to Call a Pro
Elevator maintenance and repair must be performed by licensed elevator mechanics (NAEC or equivalent certification). Bypassing safety circuits or working in elevator pits and on top of cars without proper training is extremely dangerous.