Having A Problem - Chamberlain 1120E-1/2HP Owner's Manual

SITUATION
DOOR REVERSES FOR NO
APPARENT REASON AND
OPENER LIGHTS DON'T
BLINK
OPENER LIGHTS
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

Having a Problem?

PROBABLE CAUSE & SOLUTION
1. Is something obstructing the door? Pull manual 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 24.
4. If door reverses in FULLY CLOSED position, decrease travel limits
(Page 23).
Repeat the safety reverse test after the adjustment is complete. The
need for occasional adjustment of the force and limit settings is
normal. Weather conditons in particular can affect door travel.
...DON'T TURN ON
Replace the light bulb (75 watts maximum). Use a "garage door opener
bulb" if standard bulb burns out prematurely due to vibration.
...DON'T TURN OFF
There may be a defective ground at ceiling or wall receptacle.
Door may be out of balance or springs are broken. Close door and use
manual 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. Do not increase the force to operate the opener.
1. Garage door springs are broken. See above.
2. If the problem occurs on first operation of the opener, door is locked.
Disable the door lock. If the 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 the safety reverse test after the adjustment is complete.
1. Use manual release handle to disconnect the trolley. Door can be
opened and closed manually. When the power is restored, press the
door control push bar or button and trolley will automatically reconnect
(unless trolley is in lockout position). See page 27.
2. The Outside Quick Release accessory (for use on garages with no
service door) disconnects the trolley from outside the garage in case of
power failure.
It is normal for chain to droop slightly in the closed door position. Use
manual release rope and handle to disconnect trolley. If chain returns to
normal height when the trolley is disengaged and door reverses on a 25mm
obstruction, no adjustments are needed.
If operational noise is a problem because of proximity of the opener to the
living quarters, Vibration Isolator Kit 41A3263 can be installed. This kit was
designed to minimize vibration to the house and is easy to install.
30
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