Guardian / Part reference

Guardian GUAT-340 logic board

The Guardian 425 (9-17) and 428 (03-21) manuals identify GUAT-340 as the logic board and require assembly-part replacement by a qualified technician. The October 2024 book separately lists it under 315, 425 and 428. Match the exact model, source edition and installed configuration using the rows.

US source scopeUpdated 2026-09-15Independent Anderson reference

Match the whole number.

Manufacturer identifier: GUAT-340. Keep every character when comparing it with your label or paperwork. A similar number does not establish the same component.

Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 11, column group 1; exact model heading 315; assembly item 10 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 15, row 10, column group 1; exact model heading 425; assembly item 9 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 20, row 10, column group 1; exact model heading 428; assembly item 9 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian

Values apply to the exact identifier and scope in the cited source.
Book description (observed model headings 315, 425, 428; listing context only)	logic board View source and citation details Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 11, column group 1; exact model heading 315; assembly item 10 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
Source revision	Cover dated October 1, 2024 View source and citation details Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 11, column group 1; exact model heading 315; assembly item 10 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
425 / 9-17; GDOMU11A-5: component function	logic board View source and citation details Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
425 / 9-17; GDOMU11A-5: applicability condition 1	Only the exact 425 manual edition 9-17 / GDOMU11A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. View source and citation details Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
425 / 9-17; GDOMU11A-5: applicability condition 2	The assembly-parts table requires replacement by a qualified technician. View source and citation details Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
428 / 03-21; GDOMU16A-5: component function	logic board View source and citation details Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian
428 / 03-21; GDOMU16A-5: applicability condition 1	Only the exact 428 manual edition 03-21 / GDOMU16A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. View source and citation details Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian
428 / 03-21; GDOMU16A-5: applicability condition 2	The assembly-parts table requires replacement by a qualified technician. View source and citation details Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian

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.

Source statements and their exact conditions. Use the checker below to compare equipment or a component.
Equipment or component / relationship	Evidence and conditions
315 Documented compatibility From GUAT-340 to 315.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-340 is listed directly under model 315 in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 315 Exact model 315 listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. The source footnote for this assembly table requires replacement by a qualified technician. Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 11, column group 1; exact model heading 315; assembly item 10 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 5, row 11, column group 1; exact model heading 315; assembly item 10; qualified-technician footnote immediately following native assembly table 5 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian
425 Documented compatibility From GUAT-340 to 425.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-340 is listed directly under model 425 in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 425 Exact model 425 listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. The source footnote for this assembly table requires replacement by a qualified technician. In the 425 manual (9-17; GDOMU11A-5): Only the exact 425 manual edition 9-17 / GDOMU11A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. The assembly-parts table requires replacement by a qualified technician. These requirements describe this manual edition only; they are not assigned to other source editions. Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 15, row 10, column group 1; exact model heading 425; assembly item 9 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 15, row 10, column group 1; exact model heading 425; assembly item 9; qualified-technician footnote immediately following native assembly table 15 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian 425 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian Guardian 425 manual parts referencePDF page 1, exact model and revision on cover · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian Guardian 425 manual parts referencePDF page 26 / printed page 25, qualified-technician replacement footnote below assembly table · checked 2026-09-12 · 9-17; GDOMU11A-5 · Guardian
428 Documented compatibility From GUAT-340 to 428.	Conditional Additional source conditions or an adapter must be checked before confirming compatibility. Details still needed source conditions Use the exact label and the source scope below. An unanswered condition keeps this result conditional or unverified. GUAT-340 is listed directly under model 428 in the cover dated October 1, 2024 parts book; confirm source revision and exact configuration. Applies only within this source scope Market: US Model scope: 428 Exact model 428 listing in the replacement-parts book: Cover dated October 1, 2024. Confirm the exact part and installed configuration; a listing does not establish interchangeability with another revision, model or similarly named item. The source footnote for this assembly table requires replacement by a qualified technician. In the 428 manual (03-21; GDOMU16A-5): Only the exact 428 manual edition 03-21 / GDOMU16A-5 is reviewed. No later edition, current stock or cross-model interchangeability is inferred. The assembly-parts table requires replacement by a qualified technician. These requirements describe this manual edition only; they are not assigned to other source editions. Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 20, row 10, column group 1; exact model heading 428; assembly item 9 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian replacement-parts book, cover dated October 1, 2024DOCX native table 20, row 10, column group 1; exact model heading 428; assembly item 9; qualified-technician footnote immediately following native assembly table 20 · checked 2026-09-12 · Cover dated October 1, 2024 · Guardian Guardian 428 manual parts referencePDF page 26 / printed page 25, assembly table item 9, exact part-number cell · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian Guardian 428 manual parts referencePDF page 1, exact model and revision on cover · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian Guardian 428 manual parts referencePDF page 26 / printed page 25, qualified-technician replacement footnote below assembly table · checked 2026-09-12 · 03-21; GDOMU16A-5 · Guardian

Direct replacement paths

No direct successor for GUAT-340 is verified in this reference.

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

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Selected: GUAT-340 · Read its reference. Selection identifies a record; it does not confirm fitment.

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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

Guardian 425 manual parts referenceGuardian · US · checked 2026-09-12 · 9-17; GDOMU11A-5
Guardian 428 manual parts referenceGuardian · US · checked 2026-09-12 · 03-21; GDOMU16A-5
Guardian replacement-parts book, cover dated October 1, 2024Guardian · US · checked 2026-09-12 · Cover dated October 1, 2024

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

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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.