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LiftMaster / Accessory reference

LiftMaster 850LM

LiftMaster 850LM: Three receiver channels have stated capacities of 50, 20 and 20 remotes. Inputs are 12–24 VDC or 12–24 VAC; outputs comprise one Form C and two Form A relays.

US source scopeUpdated 2026-09-12Independent Anderson reference

Match the whole number.

Manufacturer identifier: 850LM. Keep every character when comparing it with your label or paperwork. A similar number does not establish the same component.

  • Denco supplier reference: RC 850LMh1; span.sku; Description channel, power, relay, radio and operating/storage specifications; Description explicit811LM/813LM and MAX compatibility bullet · checked 2026-09-12 · Denco
Values apply to the exact identifier and scope in the cited source.
Supplier-stated detailThree receiver channels have stated capacities of 50, 20 and 20 remotes. Inputs are 12–24 VDC or 12–24 VAC; outputs comprise one Form C and two Form A relays.
View source and citation details
  • Denco supplier reference: RC 850LMh1; span.sku; Description channel, power, relay, radio and operating/storage specifications; Description explicit811LM/813LM and MAX compatibility bullet · checked 2026-09-12 · Denco
Supplier-stated detailLists narrow-band Security+ 2.0 at 310/315/390 MHz, operating temperatures from −35 to 65°C, and separate storage limits from −40 to 85°C.
View source and citation details
  • Denco supplier reference: RC 850LMh1; span.sku; Description channel, power, relay, radio and operating/storage specifications; Description explicit811LM/813LM and MAX compatibility bullet · checked 2026-09-12 · Denco
Supplier-stated detailThe supplier names 811LM, 813LM and the MAX remote-control family.
View source and citation details
  • Denco supplier reference: RC 850LMh1; span.sku; Description channel, power, relay, radio and operating/storage specifications; Description explicit811LM/813LM and MAX compatibility bullet · checked 2026-09-12 · Denco
Selection limitationChannel capacities do not prove 90 distinct enrolled remotes. Relay current ratings and channel-to-relay assignment are unspecified; LM identifiers are not LMX aliases and exact MAX membership needs evidence.
View source and citation details
  • Denco supplier reference: RC 850LMh1; span.sku; Description channel, power, relay, radio and operating/storage specifications; Description explicit811LM/813LM and MAX compatibility bullet · 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. Use the checker below to compare equipment or a component.
Equipment or component / relationshipEvidence and conditions
Denco catalog RC PPLK1-10

Documented compatibility

From Denco catalog RC PPLK1-10 to 850LM.

Conditional

Denco names RC PPLK1-10 in the stated application with 850LM. The supplier explicitly excludes direct compatibility with LiftMaster garage-door openers. The external receiver pairing does not remove that exclusion or prove a downstream installation.

Applies only within this source scope
  • Market: US
  • connection-purpose: Commercial access-control receiver pairing.
  • Denco supplier statement for the US reference catalog; confirm the installed equipment and required functions. This is not a physical fitment test.
  • The supplier explicitly excludes direct compatibility with LiftMaster garage-door openers. The external receiver pairing does not remove that exclusion or prove a downstream installation.
  • Denco supplier reference: RC PPLK1-10h1; span.sku; Description first paragraph: intended access use and explicit garage-opener exclusion; Description exact four receivers/gate protocol and simultaneous-frequency bullets · checked 2026-09-12 · Denco
811LM

Documented compatibility

From 850LM to 811LM.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • connection-purpose
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

Denco names 850LM in the stated application with 811LM. The source names 811LM and 813LM. It does not identify 811LMX or 813LMX as interchangeable, and receiver pairing does not establish installed-opener fitment.

Applies only within this source scope
  • Market: US
  • connection-purpose: Pairing the receiver with the exact named legacy remote.
  • Denco supplier statement for the US reference catalog; confirm the installed equipment and required functions. This is not a physical fitment test.
  • The source names 811LM and 813LM. It does not identify 811LMX or 813LMX as interchangeable, and receiver pairing does not establish installed-opener fitment.
  • Denco supplier reference: RC 850LMh1; span.sku; Description channel, power, relay, radio and operating/storage specifications; Description explicit811LM/813LM and MAX compatibility bullet · checked 2026-09-12 · Denco
813LM

Documented compatibility

From 850LM to 813LM.

Conditional

Additional source conditions or an adapter must be checked before confirming compatibility.

Details still needed
  • connection-purpose
  • source conditions

Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified.

Denco names 850LM in the stated application with 813LM. The source names 811LM and 813LM. It does not identify 811LMX or 813LMX as interchangeable, and receiver pairing does not establish installed-opener fitment.

Applies only within this source scope
  • Market: US
  • connection-purpose: Pairing the receiver with the exact named legacy remote.
  • Denco supplier statement for the US reference catalog; confirm the installed equipment and required functions. This is not a physical fitment test.
  • The source names 811LM and 813LM. It does not identify 811LMX or 813LMX as interchangeable, and receiver pairing does not establish installed-opener fitment.
  • Denco supplier reference: RC 850LMh1; span.sku; Description channel, power, relay, radio and operating/storage specifications; Description explicit811LM/813LM and MAX compatibility bullet · checked 2026-09-12 · Denco

Direct replacement paths

No direct successor for 850LM is verified in this reference.

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

Compare exact equipment or a component.

Check a part or accessory pairing

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Selected: 850LM · Read its reference. Selection identifies a record; it does not confirm fitment.

Choose the equipment or accessory brand separately from the component brand. A missing identifier is unverified. Use the model library to identify your equipment and its source documents.

An accessory pairing, including a receiver or wall console, applies only to the exact listed pair and source conditions. It does not establish suitability for your installed opener or compatibility through another device.

Choose the equipment or accessory brand to load its published identifiers.

Use the production date on the label or records, not the purchase date. Leave blank if unknown.

Use part and model numbers only. Never enter a serial number, PIN or access code. Your entry is used for this lookup and is not put in the page address, saved in browser storage or sent to analytics.

Choose a task and enter or select an exact identifier.

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

  1. Denco supplier reference: RC 850LMDenco · US · checked 2026-09-12
  2. Denco supplier reference: RC PPLK1-10Denco · 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.

Related equipment guides

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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.

Need help with an opener or control problem?

Garage Door Opener Repair: what an inspection or installation involves →

Share the equipment label and symptom. Availability is confirmed for the exact service address before scheduling. This reference does not establish a fault, part fitment, or repair availability for a particular model.

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.

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Let’s start with your door.

No need to leave this page. You can change your answers at any step.

  1. 1 The problem
  2. 2 Your location
  3. 3 Contact details

Your request is sent to Anderson. Appointment timing and any visit charge are confirmed with you.

What do you need help with?

Selected service: Opener repair. You can change this. Reason: Reference: LiftMaster 850LM.

If the door is crooked or partly open, keep clear. Do not adjust springs or cables yourself.

From our customers

What customers say on Google

G5.0★★★★★9 reviews
6 written Google reviews

Mama Bear

3 weeks ago

G
★★★★★
The service was fantastic- courteous, knowledgeable and honest.
Excerpt from Google review

Yehuda Robinov

a month ago

G
★★★★★
Very very professional guys good jobs good service

adam ricker

3 months ago

G
★★★★★
Great worker

David Avitan

3 months ago

G
★★★★★
They replaced three garage door motors for me, and the service was excellent from start to finish.
Excerpt from Google review

Mary larson

4 months ago

G
★★★★★
Very good service and very polite

Tippawan Markmaitree-Babin

4 months ago

G
★★★★★
Very good work, polite and flexible in scheduling appointments.

Reviews from Google. Rating and relative dates checked October 1, 2026. This is a dated snapshot, not a live feed.

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