Havinga Problem - Craftsman 139.53903DM Owner's Manual

Havinga Problem?
1. 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. Refer to Installation
Step 10: Instal/The Protector System°.
• Checkdiagnostic LEDfor flashes on the motor unit then refer
to the Diagnostic Chart on the following page.
2. My remoteswill not activate the door:
• Reprogram remotes following the programming instructions.
Refer to Programming.
• If remote will still not activate your door, check diagnostic
LEDfor flashes on motor unit then refer to Diagnostic Chart
on the following page.
-Safety R_,versing Sensor
Bell Wire
3. My door reversesfor no apparent reason: Repeatsafety
reverse test after adjustments to force or travel limits. The need
for occasional adjustment for the force and limit settings is
normal. Weather conditions in particular can affect door travel.
• Manually check door for balanceor any binding problems.
• Refer to Adjustment Step 2, Adjust the Force.
Sending Eye Safety Reversing
Sensor (Amber Indicator Light)
\
Receiving Eye Safety Reversing
Sensor (Green Indicator Light)
4. My door reversesfor no apparent reasonafter fully closing
and touchingthe floor: Repeatsafety reverse test after
adjustments to force or travel limits. The need for occasional
adjustment for the force and limit settings is normal. Weather
conditions in particular can affect door travel.
• Refer to Adjustment Step 1, Adjust the UP and DOWN Travel
Limits. Decreasedown travel by turning down limit
adjustment screw clockwise.
5. My lights will not turn off when door is open:
• The garage door opener is equipped with a security light
feature. This feature activates the light on when the safety
sensor beam has been obstructed. See Accessories page.
6. IVlymotor unit hums briefly:
• First verify that the trolley is against the stop bolt.
• Releasethe door from the opener by pulling the Emergency
Release Rope.
• Manually bring the door to a closed position.
• Loosen the chain by adjusting the outernut4 to 5 turns.
This relieves the tension.
• Run the motor unit from the remote control or door control.
The trolley should travel towards the door and stop. If the
trolley re-engageswith the door, pull he Emergency Release
Rope to disengage.
• Decreasethe UP travel by turning the UP travel adjustment
screw 2 full turns awayfrom the arrow.
• Re-tighten the outer nut so the chain is a 1/4" (6 ram) above
the base of the rail. (When the door is reconnectedand
closed, the chain will sag. This is normal.)
• If the trolley does not move away from the bolt, repeat the
steps above.
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