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Linear / Garage door opener / Family guide

Linear LDO33 and LDO50: identify the model and select the manual

These two single-light openers share a homeowner document but have different manufacturer power labels.

United States documentationSources checked 2026-09-11Independent Anderson reference

Match the model before choosing a document

Identifier: LDO33 / LDO50. This guide compares a family or related models. Use the exact configuration on your label.

Models covered: LDO33, LDO50. They are separate configurations; compare the applicable facts and documents below.

Read the complete model identifier before choosing parts. LDO33 is labelled 1/3 HP; LDO50 is labelled 1/2 HP.

The shared homeowner instructions cover both identifiers. Shared instructions establish document coverage, not interchangeable motors or electronics.

Check the installed rail separately: both models have belt and chain configurations. A photograph of the opener housing alone does not identify the drive.

Documented specifications

Values apply to the configuration named in each row. Follow the source for its exact scope.
LDO33 power label1/3 HPSource: Linear LDO33 specifications · Description
LDO50 motor1/2 HP ACSource: Linear LDO50 data sheet · Page 1
LDO33 drive optionsBelt or chainSource: Linear LDO33 specifications · Features
LDO50 drive optionsBelt or chain; T or I railSource: Linear LDO50 data sheet · Page 1

Official documents & support

These links open the manufacturer’s document or support page. Manuals are hosted by their issuer.

Filter the documents listed below by model or document type. A match is not confirmation of your unit’s revision or installed accessories; read the scope note before using a document.

2 of 2 listed documents shown.

  • owner manual

    The official index lists this same homeowner document for both models; use the exact model when ordering parts.

    Models: LDO33, LDO50enRevision not verifiedUnited States
  • datasheet

    LDO50-only sheet; its motor specification does not apply to LDO33.

    Models: LDO50enDocument: 943393294 Rev-L 04/2023United States

Parts & related references

Match the exact model and source conditions before choosing a part. Conditional statements and explicit exclusions do not confirm a fit. Open a row for its exact pairing and source.

  • AP HAE00001: Wall Station

    AP HAE00001 is the supplier wall-station listing. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    Exact pairing & sources for AP HAE00001 · 2 source statements
    Conditional

    Denco states that AP HAE00001 applies to LDO33 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP HAE00001 to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The three operator labels are explicit; wiring protocol and revision are not given.
    • Source 1: DencoDenco supplier reference: AP HAE00001 · h1; span.sku; Description bullet1: operator list · checked 2026-09-12
    Conditional

    Denco states that AP HAE00001 applies to LDO50 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP HAE00001 to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The three operator labels are explicit; wiring protocol and revision are not given.
    • Source 1: DencoDenco supplier reference: AP HAE00001 · h1; span.sku; Description bullet1: operator list · checked 2026-09-12

  • AP HAE00040: Control Board

    Denco identifies AP HAE00040 as a replacement control-board listing. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    Exact pairing & sources for AP HAE00040 · 2 source statements
    Conditional

    Denco states that AP HAE00040 applies to LDO33 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP HAE00040 to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The supplier names three operators but gives no board revision or programming state.
    • Source 1: DencoDenco supplier reference: AP HAE00040 · h1; span.sku; Description item1: three named operator models · checked 2026-09-12
    Conditional

    Denco states that AP HAE00040 applies to LDO50 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP HAE00040 to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The supplier names three operators but gives no board revision or programming state.
    • Source 1: DencoDenco supplier reference: AP HAE00040 · h1; span.sku; Description item1: three named operator models · checked 2026-09-12

  • AP 218189-01: Trolley Assembly

    AP 218189-01 is a replacement trolley listing. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    Exact pairing & sources for AP 218189-01 · 2 source statements
    Conditional

    Denco states that AP 218189-01 applies to LDO50 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP 218189-01 to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The three operator labels are explicit; rail revision and kit contents are not given.
    • Source 1: DencoDenco supplier reference: AP 218189-01 · h1; span.sku; Description bullet1: exact operator list · checked 2026-09-12
    Conditional

    Denco states that AP 218189-01 applies to LDO33 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP 218189-01 to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The three operator labels are explicit; rail revision and kit contents are not given.
    • Source 1: DencoDenco supplier reference: AP 218189-01 · h1; span.sku; Description bullet1: exact operator list · checked 2026-09-12

  • LINO HAE00047: Helical & Worm Gears

    Denco lists LINO HAE00047 as a helical and worm gear replacement kit. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    Exact pairing & sources for LINO HAE00047 · 2 source statements
    Conditional

    Denco states that LINO HAE00047 applies to LDO50 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog LINO HAE00047 to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The kit is listed for three operators. Component quantities, gear tooth counts and replaced part numbers are not stated.
    • Source 1: DencoDenco supplier reference: LINO HAE00047 · h1; span.sku; Description: replacement gear-kit model list · checked 2026-09-12
    Conditional

    Denco states that LINO HAE00047 applies to LDO33 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog LINO HAE00047 to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The kit is listed for three operators. Component quantities, gear tooth counts and replaced part numbers are not stated.
    • Source 1: DencoDenco supplier reference: LINO HAE00047 · h1; span.sku; Description: replacement gear-kit model list · checked 2026-09-12

  • AP HAE00004: Limit Switch Assembly

    Denco identifies AP HAE00004 as a replacement limit-switch assembly. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    Exact pairing & sources for AP HAE00004 · 2 source statements
    Conditional

    Denco states that AP HAE00004 applies to LDO33 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP HAE00004 to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The exact three operators are named; electrical ratings and installed revision still require confirmation.
    • Source 1: DencoDenco supplier reference: AP HAE00004 · h1; span.sku; Description bullet1: exact operator list · checked 2026-09-12
    Conditional

    Denco states that AP HAE00004 applies to LDO50 in the cited scope. Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.

    From Denco catalog AP HAE00004 to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • Denco supplier assertion for the US reference catalog; confirm the installed equipment and applicable revision. This is not manufacturer engineering verification.
    • The exact three operators are named; electrical ratings and installed revision still require confirmation.
    • Source 1: DencoDenco supplier reference: AP HAE00004 · h1; span.sku; Description bullet1: exact operator list · checked 2026-09-12

  • Linear ACT-31B key-ring radio control

    ACT-31B is a MegaCode key-ring control with one physical button and factory coding. No proximity-tag function is established in this reference. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-31B · 2 source statements
    Conditional

    ACT-31B is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31B to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-31B is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31B to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-31C key-ring radio control

    ACT-31C is a MegaCode key-ring control with one physical button and custom coding. No proximity-tag function is established in this reference. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-31C · 2 source statements
    Conditional

    ACT-31C is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31C to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-31C is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31C to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-31D key-ring radio control

    ACT-31D is a MegaCode key-ring control with one physical button and factory coding. It also has a Linear-format proximity tag. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-31D · 2 source statements
    Conditional

    ACT-31D is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31D to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-31D is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31D to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-31DH key-ring radio control

    ACT-31DH is a MegaCode key-ring control with one physical button and factory coding. It also has an HID-compatible proximity tag. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-31DH · 2 source statements
    Conditional

    ACT-31DH is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31DH to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-31DH is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31DH to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-31DHC key-ring radio control

    ACT-31DHC is a MegaCode key-ring control with one physical button and custom coding. It also has an HID-compatible proximity tag. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-31DHC · 2 source statements
    Conditional

    ACT-31DHC is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31DHC to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-31DHC is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-31DHC to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-34B key-ring radio control

    ACT-34B is a MegaCode key-ring control with four physical buttons and factory coding. No proximity-tag function is established in this reference. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-34B · 2 source statements
    Conditional

    ACT-34B is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34B to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-34B is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34B to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-34C key-ring radio control

    ACT-34C is a MegaCode key-ring control with four physical buttons and custom coding. No proximity-tag function is established in this reference. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-34C · 2 source statements
    Conditional

    ACT-34C is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34C to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-34C is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34C to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-34D key-ring radio control

    ACT-34D is a MegaCode key-ring control with four physical buttons and factory coding. It also has a Linear-format proximity tag. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-34D · 2 source statements
    Conditional

    ACT-34D is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34D to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-34D is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34D to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-34DH key-ring radio control

    ACT-34DH is a MegaCode key-ring control with four physical buttons and factory coding. It also has an HID-compatible proximity tag. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-34DH · 2 source statements
    Conditional

    ACT-34DH is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34DH to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-34DH is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34DH to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear ACT-34DHC key-ring radio control

    ACT-34DHC is a MegaCode key-ring control with four physical buttons and custom coding. It also has an HID-compatible proximity tag. The listed operator and receiver pairings cover radio control only; retain the exact variant and code-enrollment requirements.

    Exact pairing & sources for ACT-34DHC · 2 source statements
    Conditional

    ACT-34DHC is documented for LDO33 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34DHC to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B
    Conditional

    ACT-34DHC is documented for LDO50 in MegaCode radio-control use. MegaCode radio transmitter function only. The chart's proximity-reader entries and bold formatting do not establish proximity-reader functionality in these garage operators. Enroll the transmitter code using the exact equipment instructions; custom and factory coding configurations remain distinct. Code enrollment and installation follow the exact equipment instructions; this does not verify an installed system.

    From ACT-34DHC to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • comparison-function: MegaCode radio control
    • Source 1: Linear LLCACT transmitter and TRANS PROX compatibility chart · Page 4, Products Compatible with Transmitters and TRANS PROX, Garage Door Operators cell (five exact rows) and Gate Receivers cell (MDR/U row) · checked 2026-09-11 · 232495 B

  • Linear 219109 capacitor

    219109 is a capacitor listed for LDO33 in the cited revision. The row restricts this item to that named model. Match the complete identifier and source scope; availability and installation suitability are not established.

    Exact pairing & sources for 219109 · Documented compatible

    219109 is directly listed for LDO33 within this source's scope. The row says this model only.

    From 219109 to LDO33

    Applies only within this source scope
    • Market: US
    • Model scope: LDO33
    • Source 1: Nice North America LLCLinear garage operator replacement parts list · 221377 Rev-S, page 1, Operator Head Parts table, item 15, Part # and model/scope columns · checked 2026-09-11 · 221377 Rev-S

  • Linear 219110 capacitor

    219110 is a capacitor listed for LDO50 in the cited revision. The row restricts this item to that named model. Match the complete identifier and source scope; availability and installation suitability are not established.

    Exact pairing & sources for 219110 · Documented compatible

    219110 is directly listed for LDO50 within this source's scope. The row says this model only.

    From 219110 to LDO50

    Applies only within this source scope
    • Market: US
    • Model scope: LDO50
    • Source 1: Nice North America LLCLinear garage operator replacement parts list · 221377 Rev-S, page 1, Operator Head Parts table, item 16, Part # and model/scope columns · checked 2026-09-11 · 221377 Rev-S

Before applying these details

  • This is a document-selection grouping of two models, not a claim that they are one product.
  • The LDO33 product page names different remote models in its feature and package lists; included remote identity is not asserted.

Sources & scope

  1. Nice/Linear product manualsNice/Linear · checked 2026-09-11
  2. Linear LDO33 specificationsNice/Linear · checked 2026-09-11
  3. Linear LDO50 data sheetNice/Linear · checked 2026-09-11 · 943393294 Rev-L 04/2023
  4. Linear LDO33 / LDO50 homeowner instructionsNice/Linear · checked 2026-09-11

Anderson prepared this independent reference from the listed sources. It is not the manufacturer’s official support site, an installation inspection or a product test. Current stock, parts availability and warranty entitlement are not established by a listing.

Describe the symptom

Browse the troubleshooting guide

Troubleshooting guides explain observations; they do not identify a failed part from a model number.

More from Linear

Need help with an opener 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.

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What do you need help with?

Selected service: Opener repair. You can change this. Reason: Equipment: Linear LDO33 and LDO50: identify the model and select the manual.

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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