LiftMaster / Accessory reference

LiftMaster 423LM

LiftMaster 423LM: Three-channel receiver for either three residential openers or open, close and stop commands on one commercial opener with a three-button control.

US source scopeUpdated 2026-09-12Independent Anderson reference

Match the whole number.

Manufacturer identifier: 423LM. Keep every character when comparing it with your label or paperwork. A similar number does not establish the same component.

Denco supplier reference: RC 423LMh1; span.sku; Description two bullets: application alternatives and explicit fail-safe exclusion · checked 2026-09-12 · Denco

Values apply to the exact identifier and scope in the cited source.
Supplier-stated detail	Three-channel receiver for either three residential openers or open, close and stop commands on one commercial opener with a three-button control. View source and citation details Denco supplier reference: RC 423LMh1; span.sku; Description two bullets: application alternatives and explicit fail-safe exclusion · checked 2026-09-12 · Denco
Supplier-stated detail	The supplier expressly excludes residential fail-safe operators. View source and citation details Denco supplier reference: RC 423LMh1; span.sku; Description two bullets: application alternatives and explicit fail-safe exclusion · checked 2026-09-12 · Denco
Selection limitation	The arrangements are alternatives. Exact models, radio frequency and relay electrical ratings are not listed; the source does not enumerate fail-safe models. View source and citation details Denco supplier reference: RC 423LMh1; span.sku; Description two bullets: application alternatives and explicit fail-safe exclusion · checked 2026-09-12 · Denco

Documented fitment & exclusions

Read the exact equipment or component, market, production and variant limits in every row. An omitted pairing has not been verified by this reference.

A component pairing applies only to the listed items and source conditions. It does not establish suitability for an installed opener or compatibility through another component.

Source statements and their exact conditions. Read the documented direction and conditions for each pairing.
Equipment or component / relationship	Evidence and conditions
86LM Documented compatibility From 86LM to 423LM.	Conditional Denco names 86LM in the stated application with 423LM. The kit includes an antenna bracket and 15 ft cable. Cable length is not a radio-range claim. Applies only within this source scope Market: US connection-purpose: Remote antenna mounting using the 86LM kit. Denco supplier statement for the US reference catalog; confirm the installed equipment and required functions. This is not a physical fitment test. The kit includes an antenna bracket and 15 ft cable. Cable length is not a radio-range claim. Denco supplier reference: RC 86LMh1; span.sku; Description two bullets: four exact referenced models and kit contents · checked 2026-09-12 · Denco

Direct replacement paths

No direct successor for 423LM is verified in this reference.

A direct replacement statement does not establish reverse interchangeability, a kit equivalent or a later replacement chain.

The listed pairing applies in the direction shown above. Open the listed component’s reference to check its pairing with this item. You can also look up another part or accessory. A missing pairing does not establish incompatibility.

Recall references

No recall reference is included for this identifier in the published dataset. This is not a safety clearance or proof that no recall exists.

Sources & scope

Denco supplier reference: RC 423LMDenco · US · checked 2026-09-12
Denco supplier reference: RC 86LMDenco · US · checked 2026-09-12

Anderson prepared this reference from the listed evidence. Source statements are not an Anderson installation inspection or independent product test. Official documents stay on their publisher’s website.

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Confirm a missing detail

Use LiftMaster official support and match the complete part number, equipment model and production details with the source scope.

Use safely accessible labels and existing paperwork. Do not remove powered covers or adjust springs or cables to identify a component.

This is an independent Anderson reference. Manufacturer names identify the equipment and do not imply affiliation or authorized-dealer status.

A reference listing does not establish current stock, a price, eligibility for manufacturer support or that a component is faulty.