Safety first: Disconnect power and do not force the door manually if it is jammed.

Steps:

Allow motor to cool: If the opener has been used repeatedly, wait 20–30 minutes for the motor thermal cut‑out to reset. Restore power and test.
Check door balance: Release the manual release (CAME carriage lever or key release) and move the door by hand. It should move smoothly and stay roughly halfway open. If heavy or binding, have the springs and tracks serviced.
Inspect for obstructions: Check tracks, rollers, and the CAME sliding carriage for debris or bent sections that could jam movement.
Adjust force settings: On the CAME control board (e.g. ZLJ24), reduce the force trimmer if set too high, then re‑run the learning cycle as per the manual. Excessive force can trigger overcurrent protection.
Check motor connections: With power off, inspect motor wiring at the terminals (e.g. "M1", "M2"). Tighten loose screws and look for burnt insulation.

If E3 persists with a free‑moving door, the motor or thermal protector may be defective and should be tested or replaced by a technician.

Door does not move, control unit shows E3 and may beep, motor does not start

Possible Causes