Sears 39.18205SR - 1/2 HP Owner's Manual page 25

Having a Problem?
SITUATION
DOOR REVERSES FOR NO
APPARENT REASON
OPENER LIGHT
OPENER STRAINS OR MAXIMUM
FORCE IS NEEDED TO OPERATE
DOOR
OPENER MOTOR HUMS
BRIEFLY, THEN WON'T WORK
OPENER WON'T OPERATE DUE
TO POWER FAILURE
CHAIN DROOPS OR SAGS
OPENER NOISE IS DISTURBING
IN LIVING QUARTERS OF HOME
(Continued)
PROBABLE CAUSE & SOLUTION
1. Is something obstructing the door? Pull red emergency release handle. Operate
door manually. If it is unbalanced or binding, call for professional garage door
service.
2. Clear any ice or snow from garage floor area where garage door closes.
3. Review the Force Adjustment Chart on page 21.
REPEAT SAFETY REVERSE TEST after adjustment is complete.
4. If door reverses in FULLY CLOSED position, decrease travel limits (Page 20).
REPEAT SAFETY REVERSE TEST after the adjustment is complete. THE
NEED FOR OCCASIONAL ADJUSTMENT OF THE FORCE AND LIMIT
SETTINGS IS NORMAL. WEATHER CONDITIONS IN PARTICULAR CAN
AFFECT DOOR TRAVEL.
DOES NOT TURN ON
1. Replace the light bulb (75 watts maximum). Use a "garage door opener bulb" if
standard bulb burns out prematurely due to vibration. Vibration may be caused
by loose end panel. Retighten screws.
DOES NOT TURN OFF
1. There may be a defective ground at ceiling or wall receptacle.
UNIT MUST BE GROUNDED.
1. Door may be out of balance or springs are broken. Close door and use
emergency release rope and handle to disconnect trolley. Open and close door
manually. A properly balanced door will stay in any point of travel while being
supported entirely by its springs. If it does not, call for professional garage door
service.
1. Garage door springs are broken. SEE ABOVE.
2. The trolley may be jammed into stop bolts. Pull or push on door while motor is
humming to release jammed condition. Re-adjust door limits (page 20) to
prevent over-travel.
REPEAT SAFETY REVERSE TEST after adjustment is complete.
3. If the problem occurs on first operation of the opener, door is locked. DISABLE
DOOR LOCK. If chain was removed and reinstalled, motor may be out of phase.
Remove chain; cycle motor to the down position. Observe drive sprocket. When
it turns in clockwise direction and stops in down position, reinstall chain.
REPEAT SAFETY REVERSE TEST after adjustment is complete.
1. Use emergency release rope and handle to disconnect trolley. Door can be
opened and closed manually. When the power is restored, press the Wall Push
Button and trolley will automatically reconnect. Refer to Page 5 for "Lockout"
feature.
2. The emergency release Key Lock accessory (for use on garages with no service
door) disconnects the trolley from outside the garage in case of power failure.
1. It is normal for chain to droop slightly in the closed door position. Use emergency
release rope and handle to disconnect trolley. If chain returns to normal height
when the trolley is disengaged and door reverses on a one-inch obstruction, no
adjustments are needed (see page 9).
1. If operational noise is a problem because of proximity of the opener to the living
quarters, Vibration Isolator Kit 41A3263 can be ordered from any Sears Service
Center and most Sears Stores. This kit was designed to eliminate the "sounding
board effect" and is easy to install.
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