HAVING A 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 sensors are properly installed,

aligned and free of any obstructions. Refer to

Installation Step 10: Install The Protector System®.

• Check diagnostic LED for flashes on the motor unit

then refer to the Diagnostic Chart on the following

page.

2. My remotes will not activate the door:

• Verify your door control is not blinking. If it is blinking,

deactivate the Lock Mode following the instructions

for Using the Wall-Mounted Door Control.

• Reprogram remotes following the programming

instructions. Refer to Programming.

• If remote will still not activate your door, check

diagnostic LED for flashes on motor unit then refer to

Diagnostic Chart on the following page.

Bell Wire

Safety Reversing Sensor

Sending Eye Safety Reversing Sensor (Amber Indicator Light)

"Learn" Button LED or

Diagnostic

LED

Receiving Eye Safety Reversing Sensor (Green Indicator Light)

3. My door reverses for no apparent reason: Repeat

safety 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 balance or any binding

problems.

• Refer to Adjustment Step 2, Adjust the Force.

4. My door reverses for no apparent reason after fully

closing and touching the floor: Repeat safety 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. Decrease down 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. Refer to

Operation section; Using the Wall Mounted Door

Control, Light Feature.

6.My motor unit hums briefly:

•First verify that the trolley is against the stop bolt.

•Release the door from the opener by pulling the Emergency Release Rope.

•Manually bring the door to a closed position.

•Loosen the chain by adjusting the outer nut 4 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-engages with the door, pull the Emergency Release Rope to disengage.

•Decrease the UP travel by turning the UP Travel adjustment screw 2 full turns away from the arrow.

•Re-tighten the outer nut so the chain is a 1/2" (13 mm) above the base of the rail. (When the door is reconnected and 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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Chamberlain 3255M 1/2 HP, 3255-2M 1/2 HP, 3245M 1/3 HP owner manual Having a PROBLEM?
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3255M 1/2 HP, 3245M 1/3 HP, 3255-2M 1/2 HP specifications

The Chamberlain 3255-2M, 3245M, and 3255M garage door openers stand out in the market for their reliability and superior performance. Each model offers a unique combination of power and features, catering to different needs and preferences.

The Chamberlain 3255-2M is a robust 1/2 HP opener designed for heavy residential garage doors. Its powerful motor ensures smooth and efficient operation, making it ideal for doors weighing up to 7 feet high. This model incorporates the latest in opening technology, including a durable chain drive mechanism that provides strength and longevity. One of its significant features is the incorporated MyQ technology, enabling users to control their garage door remotely through a smartphone app. This innovative feature brings convenience and peace of mind, as homeowners can check the status of the door from anywhere.

Another excellent choice is the Chamberlain 3245M, a 1/3 HP model that offers a balance of performance and affordability. It is suitable for lighter doors, providing consistent and reliable opening and closing. The 3245M model also boasts a protective cover that enhances its durability against the elements. It operates quietly thanks to its direct drive system, making it an excellent option for garages attached to living spaces. Like the 3255-2M, this model is also equipped with MyQ technology, allowing users to monitor and control their garage door from their smartphones seamlessly.

Finally, the Chamberlain 3255M, another 1/2 HP opener, offers similar features to the 3255-2M but with a focus on belt drive technology. This model is built for quieter performance, making it ideal for homes where noise is a concern. The belt drive reduces vibrations and sound, ensuring a smoother user experience. This model also comes with a battery backup system, which provides added security during power outages.

All these models emphasize safety and security, featuring auto-reverse functionality that senses obstacles and prevents the door from closing on them. The Chamberlain garage door openers are also equipped with a rolling code technology that changes the access code each time the remote is used, enhancing security against unauthorized access.

In summary, the Chamberlain 3255-2M, 3245M, and 3255M garage door openers cater to a variety of needs with their powerful motors, innovative technologies, and user-friendly features. Their reliability and performance make them an excellent investment for any homeowner.
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