Bell Wire

Diagnostics

Located On

Motor Unit

 

LED or

 

Diagnostic

 

LED

 

"Learn"

Safety Reversing Sensor

Button

Installed

Safety Reversing

Sensor

Your garage door opener is programmed with self-diagnostic capabilities. The “Learn” button/diagnostic LED will flash a number of times then pause signifying it has found a potential issue. Consult Diagnostic Chart below.

Diagnostic Chart

1 FLASH

Safety reversing sensors wire open (broken or disconnected).

OR

2 FLASHES

Safety reversing sensors wire shorted or black/ white wire reversed.

3 FLASHES

Door control or wire shorted.

4 FLASHES

Safety reversing sensors slightly misaligned (dim or flashing LED).

5 FLASHES

Motor overheated or possible RPM sensor failure. Unplug to reset.

6 FLASHES

Motor Circuit Failure.

Replace Receiver

Logic Board.

Symptom: One or both of the Indicator lights on the safety reversing sensors do not glow steady.

•Inspect sensor wires for a short (staple in wire), correct wiring polarity (black/ white wires reversed), broken or disconnected wires, replace/attach

as needed.

•Disconnect all wires from back of motor unit.

•Remove sensors from brackets and shorten sensor wires to 1-2 ft. (30-60 cm) from back each of sensor.

•Reattach sending eye to motor unit using shortened wires. If sending eye indicator light glows steadily, attach the receiving eye.

•Align sensors, if the indicator lights glow replace the wires for the sensors. If the sensor indicator lights do not light, replace the safety reversing sensors.

Symptom: LED is not lit on door control.

•Inspect door control/wires for a short (staple in wire), replace as needed.

•Disconnect wires at door control, touch wires together. If motor unit activates, replace door control.

•If motor unit does not activate, disconnect door control wires from motor unit. Momentarily short across red and white terminals with jumper wire. If motor unit activates, replace door control wires.

Symptom: Sending indicator light glows steadily, receiving indicator light is dim or flashing.

•Realign receiving eye sensor, clean lens and secure brackets.

•Verify door track is firmly secured to wall and does not move.

Symptom: Motor has over heated; the motor unit does not operate or trolley is stuck on stop bolt = Motor unit hums briefly; RPM Sensor =

Short travel 6-8" (15-20 cm).

•Unplug unit to reset. Try to operate motor unit, check diagnostic code.

•If it is still flashing 5 times and motor unit moves 6-8" (15-20 cm), replace RPM sensor.

•If motor unit doesn’t operate, motor unit is overheated. Wait 30 minutes and retry. If motor unit still will not operate replace logic board.

Symptom: Motor unit doesn’t operate.

•Replace logic board because motor rarely fails.

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Chamberlain 3255-2M 1/2 HP Safety reversing sensors wire open broken or disconnected, Door control or wire shorted
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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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