Chamberlain B353 Owner's Manual page 39

Troubleshooting
DIAGNOSTIC CODE
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Flash(es) Flash(es)
4 1-4
4 5
4 6
The garage door opener can beep for several reasons:
Garage door opener has been activated through a device or feature such as Timer-to-Close or garage door
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monitor, see page 34.
My remote control will not activate the garage door:
Verify the lock feature is not activated on the door control.
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Reprogram the remote control.
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If the remote control will still not activate the door check the diagnostic codes to ensure the garage door opener
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is working properly.
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.
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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 and the light bulbs flash.
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 page 30).
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 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.
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:
Compatibility Bridge (not included) may be necessary for certain vehicles. Visit bridge.chamberlain.com to find out if a
Bridge is needed.
Wi-Fi troubleshooting
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
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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
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LEARN mode can be activated.
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