These are the current Nice Linear ceiling-mount openers. The manuals we have posted cover 861, 661, and 621. The 6xx units are rated for doors up to 8 ft and 350 lb. The 8xx units (861) are rated up to 500 lb. 661 and 861 use the Nice G.O. app when the Wi-Fi wall station is installed. 621 is the value model without the app. All three use 318 MHz MegaCode remotes such as the MDT-1A, ACT-34B, and NMTK keypad. Not every Nice Linear model or manual is shown here. We post the manuals we have. Older or uncommon units may not be listed.

Shared features

• Current Nice-body ceiling-mount DC openers
• 318 MHz MegaCode radio (not LiftMaster Security+)
• 661 and 861 work with the Nice G.O. app and the X61 Wi-Fi wall station
• 621 uses the X21 wall button and does not include app control
• Integrated LED lighting and battery backup on this series

Nice Linear Manuals

Linear 6xx / 8xx Series Installation (621, 661, 861) Download PDF

Linear 6xx / 8xx Series Quick-Start Guide Download PDF

Nice Linear 621 / 661 Owner Manual Download PDF

Nice Linear 661 Installation Instructions Download PDF

Compatible remotes and parts

Here are some common compatible Linear parts. Search all Linear parts on the store: Shop Linear Parts.

NMTK Wireless Keypad

Current MegaCode keypad. Replaces MDTK and LPWKP on these Nice Linear operators.

Shop NMTK

ACT-34B Keychain Remote

4-button MegaCode keychain. Each button can learn to a different Linear opener.

Shop ACT-34B

MDT-1A Remote

1-button MegaCode visor remote for Linear 621, 661, and 861.

Shop MDT-1A

HAE00002 Safety Sensors

Linear photo-eye safety sensors used on these residential operators.

Shop HAE00002

We don’t sell opener circuit boards. They typically aren’t the issue when experiencing problems with the operator. Go through the troubleshooting steps in the operator manual and if you still believe that you need a logic board, email store@garagedoorzone.com and we can point you to the correct part number.