LiftMaster K20-1100C-2LP-H28 Replacement Motor — 1 HP, Single-Phase Logic 5

The LiftMaster K20-1100C-2LP-H28 is the 1-horsepower single-phase motor service reference identified for documented Logic 5 commercial-door operator configurations, including GH101L5 / GSD101L5 in the manufacturer repair lists. Select it by the complete operator model, installed motor label and exact suffix. The horsepower and phase are only part of the selection: mounting, shaft, electrical connection and drive arrangement must match. It is a motor service item rather than a complete operator or a general power upgrade for an existing door system.

Compatibility — Models, Versions and Exclusions

Match the Mounting and Motor Wiring Before Ordering

Record the complete operator and motor nameplates before ordering, then compare the mounting points, shaft connection and wiring with the service drawing. The H28 suffix is part of the selection rather than an optional catalog detail. A previously modified operator needs assessment against its actual configuration; do not infer the required motor from a housing label alone.

Have qualified personnel inspect the supply, motor-control circuit, capacitor where fitted and mechanical load before replacing the motor. A drive that binds or a brake that does not release can resemble a motor fault. The replacement should restore the specified arrangement. Changing pulleys, bypassing protection or guessing a voltage connection is not an acceptable way to make an unsuitable motor operate.

Specifications and Product Identification

Before Ordering

• Record full operator model and existing motor nameplate.
• Confirm 1 HP, single phase and exact K20-1100C-2LP-H28 suffix.
• Match shaft, mounting and documented electrical connection.
• Inspect the drive and door condition before selecting a motor-only repair.

Package Contents and Separate Requirements

This offer identifies the K20-1100C-2LP-H28 replacement motor. A complete operator, reducer, brake assembly, control board, rail, trolley and door hardware are not promised as included. Confirm motor-specific supplied pieces and instructions with the current package. Similar motor photographs do not establish identical shaft or mounting details. If damage involves the brake, drive connection or wiring, identify those separate service parts before scheduling the repair.

Safety Warnings — Read Before Installation or Service

• WARNING: Motor replacement exposes hazardous voltage and moving machinery. Use qualified operator-service and electrical personnel.
• Disconnect all applicable power and secure the door or gate before disturbing the drive. Follow the required capacitor and stored-energy precautions.
• Do not connect unidentified leads, infer wiring from color alone or substitute an unapproved mounting or voltage configuration.
• Restore guards and verify motor direction, travel, reversal and all required protection functions before normal use.

Related Products and Important Differences

• CPS-U monitored commercial photo eyes — a separate protection component for approved operators and environments; not supplied with this mechanical accessory.
• TDC12X1BMC MAXUM trolley operator — a complete-operator comparison; verify accessory selection against its own documentation.

Frequently Asked Questions

Is this a complete operator?

No. It is a replacement motor service item.

Can I choose it by horsepower alone?

No. Match the full operator, suffix, mounting, shaft and electrical requirements.

Does it fit every Logic 5 operator?

No. The exact model must specify this service reference.

Will it fix a door that binds?

No. Mechanical loading and counterbalance faults require separate service.

Need Help Confirming the Right Product?

Contact Garage-DoorParts.com before ordering. Send the full equipment model, readable part labels and photographs of the installed assembly. Include the dimensions, electrical configuration or accessory details relevant to your project so the listing can be checked against the actual installation.