Understanding escalator fault codes and alarm descriptions is essential for ensuring reliable performance and user safety in vertical transportation systems.
This guide focuses on the AS330 escalator inverter system. We list common fault codes and buzzer alarms in detail. Each code helps identify issues fast and accurately.
| Fault Codes | Fault Description |
| E29 | Lower Left Comb Plate Protection Switch |
| E29 | Lower Right Comb Plate Protection Switch |
| E28 | Lower Left Entrance Safety Switch |
| E28 | Lower Left Skirt Panel Protection Switch |
| E28 | Lower Left Handrail Protection Switch |
| E27 | Lower Right Entrance Safety Switch |
| E27 | Lower Right Skirt Panel Protection Switch |
| E27 | Lower Right Handrail Protection Switch |
| E26 | Left Step Chain Protection Switch |
| E26 | Right Step Chain Protection Switch |
| E26 | Water Level Protection Switch |
| E25 | Lower Key Box Emergency Stop Switch |
| E25 | Lower Inspection Box Emergency Stop Switch |
| E25 | Lower Junction Box Emergency Stop Switch |
| E24 | Lower Step Kicker Protection Switch |
| E24 | Upper Step Kicker Protection Switch |
| E23 | Upper Left Comb Plate Protection Switch |
| E23 | Upper Right Comb Plate Protection Switch |
| E22 | Upper Left Entrance Safety Switch |
| E22 | Upper Left Skirt Panel Protection Switch |
| E21 | Upper Right Entrance Safety Switch |
| E21 | Upper Right Skirt Panel Protection Switch |
| E19 | Drive Chain Breakage Protection |
| E18 | Handwheel Detection Switch |
| E17 | Thermosensitive Switch |
| E16 | Upper Key Box Emergency Stop Switch |
| E16 | Upper Inspection Box Emergency Stop Switch |
| E16 | Control Cabinet Emergency Stop Switch |
| E14 | Thermal Protection |
| E13 | Safety PCB Fault (see sub-codes below) |
| E12 | Phase Sequence Protection |
| Buzzer sounds for 10s | Contactor Sticking |
| Buzzer sounds for 10s | Safety Contact Sticking |
| Buzzer sounds for 10s | Inverter Fault / VFD Fault |
Note
1.Fault codes are generated automatically by the controller for efficient troubleshooting.
2.Safety-related activations typically stop escalator operation.
3.Buzzer alerts do not always halt operation but should be checked promptly.
Summary and Support
This guide is a quick reference for the AS330 escalator fault codes.
If you have any questions or encounter unusual issues, contact our support team anytime.
We are here to help ensure your escalator runs safely and smoothly.
Let us know your needs — fast response, reliable solutions.
