At Control Box.
Check power is on to Control Unit (Red LED illuminated).
IF NOT, check mains plug and fuse.
Plug fully engaged on top of Control Box.
Motor wiring connections properly engaged.
Manual release lever in “engaged” position.
Limit switch cams correctly set, i.e. upper Limit Switch for fully open position, lower Limit Switch for fully closed position.
Move door manually to half-closed position and try again.
Try operation with Hand Transmitter.