Veichi JT550 Series Manual page 128

Chapter 7 Maintenance and Troubleshooting
9 Err17 Alert
Display
10
"8.8.8.8.8."
Soft-starter does not pull in;
Damaged parts on the control
board;
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JT550 Series Inverter Manual
Check if there are the loose
wires on the contactor;
Check if the contactor
malfunctions;
Check if 24V power supply can
normally power the contactor;
Contact tech support.
Change the control board.