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LiftMaster Opener Error Code MAS 2 blinks: Meaning and Fix

MAS 2 blinks
How MAS 2 blinks appears on a LiftMaster opener display.
LiftMaster commercial operator code MAS 2 blinks: logic board
Chamberlain Group product image, liftmaster.com

Also shown as: MAS flashes twice

Reading the opener display

A garage door opener reports faults through blinking LEDs on the motor head, a diagnostic window on the logic board, or the wall control. Count the flashes slowly and repeat the count before you decide what you saw. On LiftMaster the Learn button color and the count of flashes together identify the board.

LiftMaster, from the Chamberlain Group, is the professional-installer line. Its openers with a yellow Learn button report faults as LED flash counts or two-digit diagnostic codes such as 1-1 or 4-5 on the logic board. The codes apply to model numbers such as 8500W and 87504-267; check the label on your unit to confirm yours.

What causes MAS 2 blinks

How to fix it

  1. Disconnect power and release the operator from the door.
  2. Move the door by hand to find binding, a broken spring or bent track.
  3. Repair the mechanical problem before running the operator.
  4. Check the clutch adjustment per the manual.
  5. Restore power and test.

Parts you may need

PartPart no.Buy
Receiver logic board, 315MHz041DS002-2Find part

Part numbers are OEM references; confirm fit by your model number before ordering. Some links are affiliate links; we may earn a commission at no extra cost to you.

Questions

What does MAS two blinks mean?

The clutch is slipping.

Is it the operator?

Usually the door is the problem.

Pro?

Spring and track work should be done by a technician.

Other LiftMaster opener codes

LiftMaster opener code Yellow Learn LED rapid flash: openerYellow Learn LED rapid flashStuck button on a remote or keypadLiftMaster opener code 1-1: safety sensor pair1-1Safety sensor wire open or sensors not connectedLiftMaster opener code 1-2: safety sensor1-2Safety sensor wire shorted or reversedLiftMaster opener code 1-3: wall control panel1-3Door control wire shortedLiftMaster opener code 1-4: safety sensor with sunblocker1-4Safety sensors misaligned or beam blockedLiftMaster opener code 1-5: travel module1-5Travel module or RPM sensor fault

Sources

Part numbers are OEM references; confirm fit by your model number before ordering. Meanings compiled from manufacturer and parts-retailer documentation; see sources below. Unplug the appliance before opening it.

Applies to models including 8500W, 87504-267, LJ8900W, 2265, 2280, 1240R, 1345, 8075.