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Chamberlain
Garage Door Opener

Model # 1255R Official Chamberlain garage door opener

Here are the diagrams and repair parts for Official Chamberlain 1255R garage door opener, as well as links to manuals and error code tables, if available.

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Owner’s manual
Error Codes

Model diagram and schematic

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Showing 10 of 63 parts  |
Garage Door Opener Rpm Sensor Assembly 41C4398A
#15

Motor unit assembly diagram

Garage door opener rpm sensor assembly

Part #41C4398A

The manufacturer no longer makes this part, and there's no substitute part

Garage Door Opener Limit Switch 41D3452
#14

Motor unit assembly diagram

Garage door opener limit switch

Part #41D3452

The manufacturer no longer makes this part, and there's no substitute part

Garage Door Opener Drive And Worm Gear Kit (replaces 3002375, 65409) 41A2817
#3

Motor unit assembly diagram

Garage door opener drive and worm gear kit (replaces 3002375, 65409)

Part #41A2817

The manufacturer no longer makes this part, and there's no substitute part

Garage Door Opener Gear And Sprocket Assembly 41C4220A
#2A

Motor unit assembly diagram

Garage door opener gear and sprocket assembly

Part #41C4220A

The manufacturer no longer makes this part, and there's no substitute part

Start Cap 30B363
#8

Motor unit assembly diagram

Start cap

Part #30B363

The manufacturer no longer makes this part, and there's no substitute part

Garage Door Opener Motor Assembly 41D3058
#11

Motor unit assembly diagram

Garage door opener motor assembly

Part #41D3058

The manufacturer no longer makes this part, and there's no substitute part

Cover (1256r, 1255r) 41A3583-11
#12

Motor unit assembly diagram

Cover (1256r, 1255r)

Part #41A3583-11

The manufacturer no longer makes this part, and there's no substitute part

10 Foot (3m) Complete Rail 1710LM
#3

Accessories diagram

10 foot (3m) complete rail

Part #1710LM

The manufacturer no longer makes this part, and there's no substitute part

3-button Mini-remote Control With Security+(r) 970LM
#14

Accessories diagram

3-button mini-remote control with security+(r)

Part #970LM

The manufacturer no longer makes this part, and there's no substitute part

Cover (1240r) 41A3583-16
#12B

Motor unit assembly diagram

Cover (1240r)

Part #41A3583-16

The manufacturer no longer makes this part, and there's no substitute part

Most common symptoms to help you fix your garage door openers

Choose a symptom to see related garage door opener repairs.

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Why does my garage door opener open and close by itself?

Main causes: neighbor's remote programmed at the same time as yours, faulty wall control wiring, bad wall control unit…

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Why doesn't my garage door opener work?

Main causes: faulty logic control board, bad RPM sensor, broken gears in the drive system, bad drive motor…

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Why is my garage door opener noisy?

Main causes: loose fasteners, broken brackets, need preventive maintenance, worn drive gears, loose or worn belt, loose …

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What preventive maintenance does my garage door opener need?

Things to do: check garage door travel, tighten brackets and fasteners, test safety sensors, check travel limits and for…

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Why won't my garage door opener fully open or close the garage door?

Main causes: garage door opener misaligned, travel limits need adjustment, bad travel limit switches, faulty logic contr…

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Why won't my garage door opener open the garage door?

Main causes: garage door locked, damaged garage door tracks, up-force setting needs adjustment, RPM sensor failure, bad …

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Why does my garage door opener work intermittently?

Main causes: radio interference, weak remote batteries, sunlight interference with safety sensor beams, safety sensors n…

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Why does my garage door opener reverse on its own?

Main causes: safety sensor beams blocked, safety sensors not aligned, downforce setting needs adjustment, damaged garage…

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Most common repair guides to help fix your garage door openers

These step-by-step repair guides will help you safely fix what’s broken on your garage door opener.

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How to replace a garage door opener battery

How to replace a garage door opener battery

The garage door won't move during a power outage if the battery is dead. Here’s how to replace it.…

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Repair difficulty
Time required
 15 minutes or less
How to replace a garage door opener wall control

How to replace a garage door opener wall control

If you push the control button on the wall control and the garage door doesn’t move, the control is defective. Replace i…

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Repair difficulty
Time required
 15 minutes or less
How to replace a chain-drive garage door opener RPM sensor

How to replace a chain-drive garage door opener RPM sensor

Learn how to replace the RPM sensor if the door only moves 6 to 8 inches at a time and the LED light flashes 5 times. …

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Repair difficulty
Time required
 60 minutes or less

Effective articles & videos to help repair your garage door openers

Use the advice and tips in these articles and videos to get the most out of your garage door opener.

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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How to repair broken or damaged wires video

How to repair broken or damaged wires video

Learn how to repair broken, frayed or damaged wires in your appliances.…

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