Question about liftmaster Chamberlain Garage Door Opener Transmitter 300MC
Door opened and closed fine in the am; in evening when attempted to open the door using remotes it would not open, would open with hard wired control; would close using hardwired control but not remote; changed batteries, no effect; attempted to reprogram remotes using smart button, remotes would not reprogram; went online to check faq for suggestions - the two offered were change batteries in remotes and reprogram; NEED HELP
Reset the Liftmaster unit. There should be a red reset button on the unit in the garage. If this does not work, reset the breaker. Good Luck!
Posted on Jul 22, 2009
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Posted on Jan 02, 2017
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WHEN HOLDING IT DOWN MAKES THE DOOR CLOSE PROPERLY THE PROBLEM IS IN THE SAFETY EYES.
ARE BOTH LEDS ON? - CHECK FOR A LOOSE OR BROKEN WIRE.
ARE THE EYES WIRED CORRECTLY?
ARE THEY AIMED AT EACH HOLDING DOWN THE WALL BUTTON OVERRIDES THE SAFETY EYES.
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