Chamberlain retail belt-drive openers B4613T (3/4 HPS, PLUS Lift) and B970 (1-1/4 HPS, MAX Lift): quick sheet

Covers: Chamberlain retail DC belt-drive openers with built-in myQ Wi-Fi and battery backup: B4613T (PLUS Lift, rated as equivalent to 3/4 HP, integrated LED lighting, Bluetooth setup) and B970 (MAX Lift, rated as equivalent to 1-1/4 HP). Same Chamberlain Group platform as LiftMaster units of the era; for the B6765 / B4643T see the LiftMaster/Chamberlain belt-drive quick sheet.

Single sourceBrands: Chamberlain3 components

Home-center openers with a DC motor (soft start and stop), a steel-reinforced belt, myQ Wi-Fi and a backup battery. The HP figures are 'equivalent' lifting ratings, not motor nameplate horsepower. Battery-backup beeping, myQ and sensor calls dominate. Deep diagnostics: trolley opener field manual and the opener diagnostic-codes guide.

Safety first

Springs and cables: inspection only, refer to a trained door technician.
Retest reversal after any adjustment.

How it works

DC motor with soft start and stop drives the trolley through a steel-reinforced belt; quieter than chain.

Backup battery in the motor head runs the door during a power outage. The B4613T sheet states about 3 days of standby with a full charge and normal use. A beeping opener usually means the battery needs replacing.

Security+ 2.0 radio and built-in myQ Wi-Fi; the B4613T also offers Bluetooth setup.

Timer-to-close is offered in the app; it requires the safety features described in the timer-to-close guide.

Components & tests

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Ceiling-mounted chain-drive garage door opener with its rail by Dave Dugdale, CC BY-SA 2.0

Diagnostic guides for this appliance

Guide · Garage Door Opener

Garage door openers: reading LED, arrow and light-flash diagnostic codes (LiftMaster/Chamberlain, Genie)

Openers report problems through the indicator that model has: LiftMaster/Chamberlain uses the LED next to the Learn button or a pair of UP and DOWN arrows (read as a count of UP flashes then DOWN flashes); Genie uses powerhead LEDs and separate sensor LEDs. The model number on the motor label decides which chart applies. The method is the same: identify the indicator, count over two repeats, look up that model's chart.

6 steps ~15 mineasy

Guide · Garage Door Opener

Garage door opener safety tests: monthly reversal test, photo-eye test and after-adjustment retest

Chamberlain/LiftMaster say the safety reversal system must be tested every month and after any adjustment to force, travel, the door arm, springs, hardware or the floor. Place a 1-1/2 in object (a 2x4 laid flat) centered under the open door and close it: the door must reverse on contact. Then break the photo-eye beam while closing: the door must stop and reverse. If it fails, adjust per the manual or take the opener out of service until a door tech fixes it.

6 steps ~20 mineasy

Guide · Garage Door Opener

Car HomeLink won't program to a Security+ 2.0 (yellow LEARN) opener

Confirm the opener's radio (yellow LEARN button means Security+ 2.0), then use the vehicle's HomeLink procedure with a fresh remote battery and the 30-second LEARN window. Many older HomeLink vehicles cannot speak Security+ 2.0 and need a Chamberlain/LiftMaster HomeLink compatibility bridge.

7 steps ~20 mineasy

Other garage door openers manuals

Manual · Garage Door Opener

LiftMaster 8550 / 8550W / 8550WLB Elite Series DC belt drive with battery backup: quick sheet

LiftMaster Elite Series DC belt-drive openers with the built-in 485LM battery backup: the original 8550 (Security+ 2.0, myQ through a separate 828LM Internet Gateway) and the Wi-Fi versions 8550W, 8550WL (lock-capable) and 8550WLB, which Chamberlain groups in one owner's manual with 8550WLB-267, 8557W, 8587W/8587WL, 85503 and WLED. All have the round yellow LEARN button. Units built from 2022 carry a Step Saver Setup sticker under the LEARN button and use a different setup article. Model and serial are on the label on the motor unit. Flash/diagnostic codes are not repeated here: see the LiftMaster / Chamberlain belt-drive quick sheet (quicksheet-liftmaster-chamberlain-belt-drive). Search terms: LiftMaster 8550W beeping, 8550 battery light red, 485LM battery replacement, 8550W won't connect Wi-Fi, LiftMaster Elite battery backup orange light.

7 components8 common failuresLiftMaster, Chamberlain

Manual · Garage Door Opener

Craftsman openers built by Chamberlain (Sears 139.x and current CMXEOCG series): quick sheet

Craftsman-brand trolley openers made by The Chamberlain Group: the Sears-era units whose model number starts with 139. (for example 139.53915 belt drive) and the current Craftsman line sold through Lowe's and Ace under Stanley Black & Decker's brand license, such as the CMXEOCG471 Smart chain drive (myQ / Wi-Fi) and CMXEOCG781 (Wi-Fi with battery backup, unverified). Craftsman models starting with 200. were built by Guardian and are not covered. The serial number is on the motor unit label; on CMXEOCG units that serial is also used to add the opener to myQ. Codes are not repeated here: the current units use the Chamberlain Security+ 2.0 chart, see the LiftMaster / Chamberlain chain-drive quick sheet (qs-liftmaster-chamberlain-chain-drive). Search terms: Craftsman garage door opener blinking, Craftsman 139 limit adjustment, CMXEOCG471 won't close, Craftsman opener learn button color, Craftsman myQ setup.

6 components7 common failuresCraftsman, Chamberlain

Manual · Garage Door Opener

Ryobi GD200 / GD200A / GD201 Ultra-Quiet belt-drive opener (ONE+ battery backup): quick sheet

Ryobi 2 HPs Ultra-Quiet belt-drive modular opener launched in 2016 as a Home Depot exclusive: GD200, the later GD200A (manual used here) and GD201 (retail listings describe it as the same 2 HPs battery-backup opener; unverified). Built for One World Technologies (TTI). Accessory modules plug into the head: GDM330 cord reel, GDM421 fan, GDM222 laser park assist, GDM920 CO alarm, GDM120 speaker. One independent blog reports the line has been discontinued with little parts support (unverified). Search terms: Ryobi garage door opener beeping, Ryobi GD200 limits not set, Ryobi opener all buttons blinking, Ryobi GD200A won't close, Ryobi garage door opener Wi-Fi.

6 components8 common failuresRyobi