Modern escalators are equipped with multiple safety monitoring devices to protect passengers and ensure reliable operation. When a fault occurs, the controller displays a corresponding fault code, allowing maintenance personnel to quickly identify the affected component and take corrective action.
This guide explains the common fault codes used on 508 escalators, their meanings, whether the escalator will stop, and the required reset method.
508 Escalator Fault Code List
|
Code |
Fault Description |
Escalator Status |
Reset Method |
| 1 | Drive chain break switch activated | Stop | Power-off reset |
| 2 | Upper & lower handrail entrance safety switch | Stop | Non power-off reset |
| 3 | Upper landing safety switch | Stop | Non power-off reset |
| 4 | Lower landing safety switch | Stop | Non power-off reset |
| 5 | Auxiliary brake activated | Stop | Non power-off reset |
| 6 | Upper landing step missing | Stop | Power-off reset |
| 7 | Lower landing step missing | Stop | Power-off reset |
| 8 | Motor brake not released or brake shoe worn | Stop | Power-off reset |
| 9 | Lubrication system low oil level | Stop | Power-off reset |
| 10 | Unintended reverse operation | Stop | Power-off reset |
| 11 | Contactor failed to engage after startup | Stop | Power-off reset |
| 12 | Contactor failed to release after stopping | Stop | Non power-off reset |
| 13 | Left handrail speed abnormal | Stop | Power-off reset |
| 14 | Right handrail speed abnormal | Stop | Power-off reset |
| 15 | Safety relay contact welded | Stop | Non power-off reset |
| 17 | Lower pit water level detected | Stop | Non power-off reset |
| 0 | Key switch reset (Zero Position) | Stop | Non power-off reset |
| H | Main drive speed abnormal | Stop | Power-off reset |
| E | Emergency stop button activated | Stop | Non power-off reset |
| J | Motor thermal protection or phase loss alarm | Stop | Non power-off reset |
| P | Normal operating status | Running | — |
| L | Inspection mode | Inspection Operation | — |
Understanding Reset Methods
The controller uses two different reset methods depending on the fault type.
Power-off Reset
These faults require the escalator to be powered off before restarting. They usually involve critical safety systems or mechanical components, including:
- · Drive chain faults
- · Missing steps
- · Brake abnormalities
- · Main drive speed faults
- · Handrail speed faults
- · Motor startup failures
Before restoring power, the root cause must be completely eliminated.
Non Power-off Reset
Some faults can be cleared without disconnecting the power after the abnormal condition has been removed.
Typical examples include:
- · Safety switch activation
- · Emergency stop button
- · Auxiliary brake
- · Water level detection
- · Safety relay faults
Even if power cycling is not required, technicians should always verify that the safety circuit has returned to normal before restarting the escalator.
Operating Status Indicators
In addition to fault codes, the controller also displays operating status.
P — Normal Operation
The escalator is running normally and all monitored safety devices are functioning correctly.
L — Inspection Mode
The escalator is operating under maintenance or inspection mode. Passenger service is disabled while technicians perform testing or servicing.
Whether you need replacement escalator parts, technical support, or modernization solutions, YuanQi provides high-quality products and professional services to keep your escalators operating safely and efficiently.
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Post time: Jun-26-2026