Z2020 plasma THC factory reset and E5 (P09) Source-Date (SAST): 2023-08-19 12:53 Dest: public Review-after: 2027-02-28 Status: current Facts Compatible with other THC models, but a default install can show E5. Factory reset (Z2020): press ENTER and - (minus) together, then + (plus) to confirm. No prompt; the unit reboots after the sequence. P09 is limit-switch type. Wrong setting causes E5. 0 = NO, 1 = NC. If the THC torch up/down motor runs in reverse, swap the wires of 2.4 MOTOR1 and 2.5 MOTOR2.