Chamberlain HD750WF Manual page 40

Troubleshooting
DIAGNOSTIC CODE
Up Arrow Down Arrow
Flash(es) Flash(es)
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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
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garage door monitor, see page 33.
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
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door opener 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 sensors are properly installed, aligned and free of any obstructions.
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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. These features 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).
The LEDs on the door control blink:
If you have a Smart Control Panel installed and the TTC is set to a custom time, press the ON button on
the Premium Motion-Detecting Control Panel to set the time properly.
SYMPTOM
Opener runs approximately 6-8", stops and reverses.
The garage door opener will not close and the light bulbs flash.
SOLUTION
Communication error to travel module. Check travel module connections, replace travel module if
necessary.
Safety 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.
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My vehicle's Homelink is not programming to my garage door opener:
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Compatability Bridge (not included) may be necessary for certain vehicles. Visit
bridge.chamberlain.com to find out if a Bridge is needed.
Wi-Fi troubleshooting
If your black adjustment button is not solid green go to wifihelp.chamberlain.com.
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