LiftMaster 85870 Instructions D'installation page 37

Troubleshooting
DIAGNOSTIC CODE
Up Arrow Flash Down Arrow Flash
(es) (es)
4 1-4
4 5
4 6
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 30 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
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 4 or
visit LiftMaster.com/Customer-Support for more information.
My door will not close:
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.
SYMPTOM
Door is moving, stops or reverses.
Opener runs approximately 6-8" (15-20 cm), stops and
reverses.
The garage door opener will not close.
SOLUTION
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 26).
Communication error to travel module. Check travel module connections, replace travel module if
necessary.
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.
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
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
characters
provided with it.
37
®
is not programming to my garage door opener: