Can’t find your part? Contact us:

+1-309-603-4777

Garage Door Opener

Model # 3850-267 Official Chamberlain garage door opener

Here are the diagrams and repair parts for Official Chamberlain 3850-267 garage door opener, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

Click a diagram to see the parts shown on that diagram.
In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual

Model diagram and schematic

SEARCH WITHIN THIS MODEL

ALL PARTS

Showing 10 of 49 parts |

Garage Door Opener Light Socket 4A1344

Garage door opener light socket

Part #4A1344

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

One-piece T-rail 2777BD

One-piece t-rail

Part #2777BD

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

Push Bar For Door Control 101D173

Push bar for door control

Part #101D173

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

3-button Mini-remote Control With Security + 370LM

3-button mini-remote control with security +

Part #370LM

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

Smart Control Panel (trademark) 398LM

Smart control panel (trademark)

Part #398LM

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

Installation Hardware Bag 41A2770-13

Installation hardware bag

Part #41A2770-13

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

Security + 4-button Remote Control 374LM

Security + 4-button remote control

Part #374LM

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

Garage Door Monitor 915LM

Garage door monitor

Part #915LM

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

3-button Security + Remote Control 373P

3-button security + remote control

Part #373P

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

Outside Quick Release 1702LM

Outside quick release

Part #1702LM

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.

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…

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…

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…

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…

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 …

Why is my garage door opener noisy?

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

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…

Why does my garage door opener work intermittently?

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

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.

How to replace a chain-drive garage door opener motor

How to replace a chain-drive garage door opener motor

Get your garage door moving again by replacing a defective motor in your garage door opener.…

Repair difficulty

Time required

60 minutes or less

How to replace a belt-drive garage door opener motor

How to replace a belt-drive garage door opener motor

The garage door won't move if the motor is defective. Here’s how to fix it.…

Repair difficulty

Time required

60 minutes or less

How to replace a garage door opener drive chain and cable assembly

How to replace a garage door opener drive chain and cable assembly

If your garage door won’t move, the chain and cable assembly on your garage door opener could be broken. Follow these st…

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.

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.…

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.…

How to open a garage door with an opener manually

How to open a garage door with an opener manually

Learn how to open a garage door manually if power to your garage door opener fails.…

Stay Connected