Opener does not respond, display shows code 6 or flashes six times after a failed cycle.

Safety first: Ensure the door area is clear of people and objects before running any setup or auto‑learn cycle.

• Reset limits: On Merlin openers with digital controls, press and hold the "SET" or "PROGRAM" button (refer to your specific model) until the display enters setup mode. Follow the on‑screen or LED prompts to set the fully closed and fully open positions.
• Manual limit adjustment (if equipped): Some older Merlin units have mechanical limit screws. With power off, remove the cover and locate the UP and DOWN limit screws. Turn in small increments (1/4 turn) and test travel until the door stops correctly at both ends.
• Check travel sensor/encoder: Inspect the travel encoder wheel or magnetic sensor on the motor shaft or rail (depending on model) for dirt, damage, or loose mounting. Clean gently and reseat connectors.
• Run full auto‑set cycle: Many Merlin models require running a full open and close cycle to learn force and travel. Start the cycle and do not interrupt until complete.
• Power cycle: After programming, disconnect power for 30 seconds, reconnect, and test normal operation.