1. the supply voltage is not connected or fuse fuse is broken.
2. power supply is less than 380V.
3. there is a phase or two phase open circuit in three-phase AC power supply.
The 4. lock switch is in bad or damaged contact.
5. emergency switch button switch does not reset after operation, or its contact is bad or damaged.
6. the safety switch and speed limiter switch are not reset, or the switch itself is bad or damaged.
JIAXING XIE ELEVATOR CO.,LTD.
Contact: Tony Yu