Travel limits not programmed

A LiftMaster or Chamberlain 4 up-arrow, 6 down-arrow flash means the opener has lost its travel limits — it no longer knows where the floor is or where fully-open sits. That commonly happens after a power event, a board reset, or on a freshly installed unit that was never programmed. The door may run to the wrong spot, stop short, or refuse to move until the limits are set.

Re-running the travel programming clears it: on most units you hold the black or adjustment buttons per the manual to teach the up and down positions, then let the opener run a full force-learning cycle. It's a DIY job with the manual in hand. The one caveat is a board that won't hold the limits — if the opener keeps forgetting its travel after you set it, the logic board is failing and it's time for a tech quote.

Meaning: The opener doesn't know where the floor and the fully-open position are — travel limits were never set or were lost (often after a power event or board reset).
Likely fix: Re-run the travel programming: on most units, hold the black/adjustment buttons per the manual to set the up and down positions, then let it run a full force-learning cycle.
DIY or pro: DIY-possible with the manual in hand; pro if the limits won't hold — a board that keeps forgetting its travel is failing.

Code tables vary by model year — confirm against your model's manual (model number is on the motor head, under the light lens). Unplug the opener before touching any wiring.

Check another — Select your opener's flash pattern

Use the Garage Door Opener Blink Code Decoder to check any other option, or jump straight to one of these:

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