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45
Troubleshooting
DIAGNOSTIC CODE SYMPTOM SOLUTION
Up Arrow Flash(es) Down Arrow Flash(es)
4 1-4 Door is moving stops or reverses. Manually open and close the door. Check for binding or obstructions, such as a broken spring or
door lock, correct as needed. If the door is binding or sticking contact a trained door systems
technician. If door is not binding or sticking attempt to reprogram travel (refer to page 30).
4 5 Opener runs approximately 6-8" (15-20 cm), stops
and reverses.
Communication error to travel module. Check travel module connections, replace travel module if
necessary.
4 6 The garage door opener will not close and the light
bulbs flash.
Safety reversing sensors are misaligned or were momentarily obstructed. Realign both sensors to
ensure both LEDs are steady and not flickering. Make sure nothing is hanging or mounted on the door
that would interrupt the sensor’s path while closing.
The garage door opener will NOT enter Wi-Fi
®
LEARN mode:
• After the initial installation of the garage door opener, the garage door opener must
complete a full cycle (open and closed) before the Wi-Fi LEARN mode can be activated.
• If there has been a recent power outage, the garage door opener must complete a full cycle
before the Wi-Fi LEARN mode can be activated.
See page 36 to activate Wi-Fi LEARN mode.
Cannot connect garage door opener to home Wi-Fi network:
• Ensure the myQ
®
Serial number was entered correctly and try again. The myQ
®
characters
are between A-F and 0-9 only.
• Weak Wi-Fi signal in the garage. Ensure the Wi-Fi signal is reaching the garage, see page 4
or visit LiftMaster.com/Customer-Support for more information.
My door will not close and the light bulbs blink on my motor unit:
The safety reversing sensor must be connected and aligned correctly before the garage door opener
will move in the down direction.
• Verify the safety reversing sensors are properly installed, aligned and free of any
obstructions.
My garage door opener light(s) will not turn off when the door is open:
The garage door opener is equipped with a feature that turns the light on when the safety reversing
sensors have been obstructed. This feature can be disabled using the door control, see page 38 or
page 40.
My neighbor’s remote control opens my garage door:
Erase the memory from your garage door opener and reprogram the remote control(s).
My vehicle's Homelink
®
is not programming to my garage door opener:
Depending on the make, model, and year of your vehicle an external adapter may be required. Visit
www.homelink.com for additional information.
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