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39
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 26).
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:
l
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.
l
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 32 to activate Wi-Fi LEARN mode.
Cannot connect garage door opener to home Wi-Fi network:
l
Ensure the MyQ Serial number was entered correctly and try again. The MyQ
characters are between A-F and 0-9 only.
l
Weak Wi-Fi signal in the garage. Ensure the Wi-Fi signal is reaching the garage,
see page 4 or visit WiFiHelp.LiftMaster.com 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.
l
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 or when the motion sensor on the door
control detects movement in the garage. This feature can be disabled using the door
control, see page 34.
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.
To troubleshoot the optional automatic garage door lock model 841LM, see the
instructions provided with it.