Blink 1-4

How to Fix It

1. Power off and locate the travel switches.

   Switch the breaker off.
   Look at the rail near the trolley's two extreme positions (one at the open end, one at the closed end).
   Each has a small switch with a springy arm that the trolley contacts at end of travel.

2. Inspect the switch arms.

   Each switch arm should stick out into the trolley's path.
   If a switch arm is bent away, the trolley passes without triggering it — that's blink 1-4.
   Bend it gently back toward the trolley path with pliers.
   Don't over-bend — the spring should still flex when contact is made.

3. Test by manually moving the trolley.

   With power off, manually push the trolley along the rail (release the rope first if it's locked to the door).
   As you reach each end, the trolley should depress the switch arm — listen for a click.
   If no click, the switch is broken inside and needs replacement.

4. Check the switch wiring.

   Each switch has two thin wires running back to the controller.
   Push each wire connector firmly to reseat.
   Look for any wire that's frayed where it enters the connector — frayed wires cause intermittent blink 1-4.

5. Replace the switch if necessary.

   If the arm is straight, wires are tight, and the switch still doesn't click, the switch itself has failed.
   Replacement switches are 10–15 USD from LiftMaster.
   Two screws and a wire connector — 5-minute swap.
   Match the part number for your specific opener.