1. Craftsman 1/2 Hp Garage Door Opener Manual 41a5021-3g
2. Troubleshoot Craftsman 1 2 Hp Garage Opener
3. Craftsman Garage Door Openers Manuals
4. 1 2 Hp Craftsman Garage Door Troubleshooting
5. Craftsman 3 4 Garage Door Opener Manual

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Planning (Continued)

ONE-PIECE DOOR INSTALLATIONS

• Generally, a one-piece door does not require

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1. Each of the several models of the Craftsman 1/2 HP garage door opener is operated by a chain drive. Most of the features and functions on each model work in the same way. When problems arise, following some basic troubleshooting steps will help diagnose the cause of the problem.
2. The CRAFTSMAN 1/2 HP Chain Drive Garage Door Opener features many safety, security, and convenience features built-in. This chain drive opener will provide years of dependable performance.

reinforcement. If your door is lightweight, refer to

the information relating to sectional doors in

Installation Step 11.

• Depending on your door’s construction, you may

need additional mounting hardware for the door
bracket (Step 11).

A

WARNING

Without a properly working safety reversal system,

persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
• The gap between the bottom of the garage door and

the floor MUST NOT exceed 1/4' (6 mm). Otherwise,
the safety reversal system may not work properly.

• The floor or the garage door MUST be repaired to

eliminate the gap.

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ADJUSTMENT STEP 2

Adjust the Force

Force adjustment controls are located on the back
panel of the motor unit. Force adjustment settings
regulate the amount of power required to open and

close the door.

If the forces are set too light, door travel may be
interrupted by nuisance reversals in the down

direction and stops in the up direction. Weather
conditions can affect the door movement, so
occasional adjustment may be needed.

The maximum force adjustment range is about
3/4 of a complete turn. Do not force controis
beyond that point. Turn force adjustment controls
with a screwdriver.

NOTE: If anything interferes with the door’s upward

travel, It will stop. If anything interferes with the

door’s downward travel (including binding or

unbalanced doors), it will reverse.

Craftsman 1/2 Hp Garage Door Opener Manual 41a5021-3g

A

WARNING

Without a properly installed safety reversal system,
persons (particularly small children) could be
SERIOUSLY INJURED or KILLED by a closing garage
door.
• Too much force on garage door will interfere with

proper operation of safety reversal system.

• NEVER increase force beyond minimum amount

required to close garage door.

• NEVER use force adjustments to compensate for a

binding or sticking garage door.

• If one control (force or travel limits) is adjusted, the

other control may also need adjustment.

• After ANY adjustments are made, the safety reversal

system MUST be tested. Door MUST reverse on
contact with f-f/2' (3.8 cm) high object (or 2x4 laid
flat) on floor.

HOW AND WHEN TO ADJUST THE FORCES

1. Test the DOWN (close) force

• Grasp the door bottom when the door is about

halfway through DOWN (close) travel. The door
should reverse. Reversal halfway through down

travel does not guarantee reversal on a 1-1/2'
(3.8 cm) obstruction. See Adjustment Step 3,

Troubleshoot Craftsman 1 2 Hp Garage Opener

page 29.
If the door is hard to hold or doesn't reverse,

DECREASE the DOWN (close) force by turning

the control counterclockwise. Make small
adjustments until the door reverses normally.
After each adjustment, run the opener through a
complete cycle.

• If the door reverses during the down (close)

cycle and the opener lights aren't flashing,

INCREASE DOWN (close) force by turning the

control clockwise. Make small adjustments until
the door completes a close cycle. After each
adjustment, run the opener through a complete
travel cycle. Do not increase the force beyond

the minimum amount required to close the door.

2. Test the UP (open) force

• Grasp the door bottom when the door is about

halfway through UP (open) travel. The door
should stop. If the door is hard to hold or
doesn't stop, DECREASE UP (open) force by

turning the control counterclockwise. Make small
adjustments until the door stops easily and
opens fully. After each adjustment, run the
opener through a complete travel cycle.

• If the door doesn’t open at least 5 feet (1.5 m),

INCREASE UP (open) force by turning the

control clockwise. Make small adjustments until
door opens completely. Readjust the UP limit if
necessary. After each adjustment, run the
opener through a complete travel cycle.

Force

Adjustment

Craftsman Garage Door Openers Manuals

Controls

Back panel

ADJUSTMENT LABEL

A

* A

Open Force

Close Force

1 2 Hp Craftsman Garage Door Troubleshooting

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