Display shows E13; unit will not start due to handle or trigger error

Safety: Unplug the unit before opening the handle assembly.

• Inspect trigger movement: Squeeze the trigger and confirm it returns smoothly. If it feels loose or does not spring back, the internal lever or spring may be broken.
• Open handle housing: Remove screws from the handle and separate the halves. Locate the trigger microswitch and check that the trigger tab properly actuates it.
• Test microswitch: Disconnect the switch and test continuity with a multimeter while pressing the button. Replace the switch if it does not change state reliably.
• Check wiring: Follow the handle cable down to the main body. Ensure the connector is fully seated on the control board and the cable is not pinched.