The switch assembly or the internal wire assembly has a bad connection.
First, check the battery. Ensure it's fully seated in the battery cover assembly and charged. If the battery is good, the issue is electrical.
- Inspect the internal wire assembly (part number 202-6) for any visible damage or loose connections where it plugs into the power unit.
- Check the film switch (part number 202-1) on the handle. Look for tears or debris.
- Examine the switch assembly (part number 7) and the switch electric assembly (part number 202-17). Ensure all screws (part number 5620157006) securing them are tight.
If that didn't work, the fuse PCBA (part number 201-14) might be blown. This requires checking with a multimeter or replacing the component.
Heads up: Always disconnect the battery before inspecting any electrical components.