Situation

The door opens but won't close:

Having a Problem? (continued)

Probable Cause & Solution

1.If the opener lights blink, check the safety reversing sensor. See page 23.

2.If the opener lights do not I_link and it is a new installation, check the down force. See Adjustment Step 2, page 29. For an existing installation, see below.

Repeat the safety reverse test after the adjustment is complete•

The door reverses for

no apparent reason and opener lights don? blink:

The door reverses for no apparent reason and opener lights blink for 5 seconds after reversing:

The opener lights:

The opener strains or maximum force is

needed to operate door:

The opener motor

hums briefly, then won't work:

1.Is something obstructing the door? Pull the red emergency release handle. Operate

the door manually. If it is unbalanced or binding, call for professional garage door service.

2.Clear any ice or snow from the garage floor area where the door closes.

3.Review the force adjustment procedures on page 29.

4.If door reverses in the fullyclosedposition, decrease the travel limits (page 28).

Repeat safety reverse test after adjustments to force or travel limits• The need for occasional adjustment of the force and limit settings is normal• Weather conditions in particular can affect door travel•

Check the safety reversing sensor. Remove any obstruction or align the receiving eye. See page 23.

•..don't turn on:

Replace the light bulbs (75 watts maximum). Use a standardneckgarage door opener bulb if regular bulb burns out.

•..don't turn off:

Is the Light feature on? Turn it off.

The door may be out of balance or the springs are broken. Close the door and use the emergency release to disconnect the trolley. Open and close the door manually. A properly balanced door will stay in any point of travel while being supported entirely by itssprings. If it does not, disconnect the opener and call a professionalgarage door serviceman. Do not increase the force to operate the opener.

1.The garage door springs are broken. See above.

2.If the problem occurs on the first operation of the opener, door may be locked. Disable the doorlock. If the belt was removed and reinstalled, the motor may be out of phase. Remove the belt; cycle the motor to the down position. Observe the drive sprocket.

When it turns in a clockwise direction and stops in the down position, reinstall the belt. Repeat the safety reverse test after the adjustment is complete.

The opener won't operate due to

power failure:

The belt droops or sags:

1.Use the emergency release to disconnect the trolley. The door can be opened and closed manually. When the power is restored, press the Door Control push button and trolley will automatically reconnect (unless trolley is in lockout position.) See page 32.

2.The Emergency Key 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 the belt to droop slightly in the closed door position. Use the manual release rope and handle to disconnect the trolley. If no droop remains when the outer trolley is disengaged, no adjustments are needed.

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Craftsman 139.53664SRT2 owner manual Probable Cause & Solution
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139.53664SRT2 specifications

The Craftsman 139.53664SRT2 is a highly regarded garage door opener that combines reliability, advanced technology, and user-friendly features. Designed for residential use, this model stands out due to its robust functionality and ease of installation, making it a popular choice among homeowners.

One of the standout features of the Craftsman 139.53664SRT2 is its powerful motor. It boasts a 1/2 horsepower motor capable of lifting standard residential garage doors with ease. This strength means reliable performance even in adverse weather conditions, ensuring that your door operates smoothly and efficiently each time.

Another key technology in this model is the Smart Control system. The Craftsman 139.53664SRT2 allows users to operate their garage door remotely, thanks to its built-in Wi-Fi connectivity. By connecting to a smartphone app, homeowners can monitor and control their garage door from anywhere, providing added convenience and security. This feature also enables users to receive alerts and notifications, ensuring they are always informed about the status of their garage door.

Security is a top priority for the Craftsman brand, and the 139.53664SRT2 features advanced security measures, including rolling code technology. This technology generates a new access code each time the remote is used, effectively preventing unauthorized access and ensuring that your garage remains secure.

The installation of the Craftsman 139.53664SRT2 is straightforward, thanks to its user-friendly design and comprehensive instructions. Many users appreciate that it can be installed as a DIY project, saving on installation costs while providing the satisfaction of completing the task themselves. The system is compatible with most existing garage door systems, making it versatile for different setups.

In terms of noise level, the Craftsman 139.53664SRT2 operates quietly, allowing for a smooth opening and closing process without disturbing the household. This feature is particularly beneficial for those with living spaces above the garage.

Overall, the Craftsman 139.53664SRT2 is a dependable garage door opener that integrates modern technology, ensuring safety, convenience, and ease of use. Its powerful motor, Wi-Fi capability, and enhanced security features make it a valuable addition to any home.
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