Generator Warranties: What's Actually Covered
By LumoWatt Editorial Team · Published 2026-08-02 · Updated 2026-10-11
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Most homeowners assume their generator comes with one warranty. In practice, there are three separate protection types that cover different things at different times:
- Manufacturer warranty: comes with the generator purchase, covers defects and mechanical failures for a set term.
- Extended service contract: purchased separately from an installer or directly from the manufacturer, continues protection after the standard warranty expires or expands what it covers.
- Home warranty add-on: an ongoing subscription through a home warranty company that covers wear-and-tear breakdowns after your manufacturer warranty ends.
Understanding which you have, which you're buying, and what each actually covers prevents expensive surprises years after the installation.
What the manufacturer warranty actually covers
A residential standby generator manufacturer warranty typically covers the core mechanical and electrical components:
- Engine block and internal components: pistons, connecting rods, crankshaft, camshaft
- Alternator: the stator windings and rotor that produce electricity
- Control board and wiring harness: the generator's electronics and internal wiring
- Voltage regulator: the component that maintains steady output voltage
- Automatic transfer switch (ATS): when the ATS is factory-installed and sold as a unit (not a separately purchased third-party switch)
Coverage is for manufacturing defects and component failures under normal operating conditions. It is not coverage for every possible problem that might occur.
Labor coverage differs by brand. Kohler and Briggs & Stratton cover parts, labor, and travel for the full term, while Generac's air-cooled warranty covers labor only in years 1 and 2. Confirm the terms for your specific model before you buy, since they vary by product line and change over time.
What manufacturer warranties exclude
Knowing what the warranty does NOT cover is as important as knowing what it does. Standard exclusions across all major brands:
- Consumables and wear parts: engine oil, air filters, spark plugs, oil filters, and the battery are maintenance items, not defects. Their replacement is your expense regardless of warranty status.
- Acts of nature: flood, lightning strike, fire, ice storm damage. Those fall under your homeowners insurance policy, not the generator warranty (see our generator insurance guide).
- Improper installation: warranties exclude damage caused by improper installation. Generac's, for example, also requires warranty repairs and diagnostics to be done by its authorized dealers, which is a real reason to use an authorized installer.
- Unauthorized modifications: adding aftermarket parts or modifying the generator voids coverage on the affected components.
- Maintenance neglect: Generac's warranty, for example, requires the scheduled maintenance in the owner's manual, says an authorized dealer should do it, and asks for proof of maintenance. Missing it gives the manufacturer grounds to deny a claim.
- Contaminated fuel or nonstandard fuel connections: Generac's warranty, for example, excludes failures caused by contaminated fuels and fuel connections other than a utility natural gas supply or a standard LP vapor system.
- Cosmetic damage: rust, fading, scratches, and cabinet damage from weather exposure.
The maintenance-neglect exclusion is the one homeowners most often miss. Read our maintenance schedule guide for what annual service actually includes.
How the major brands compare on warranty
| Brand | Standard warranty | Notes |
|---|---|---|
| Generac | 5-year limited | Air-cooled models: parts, labor, and travel in years 1 and 2, parts in year 3, engine and alternator parts only in years 4 and 5 |
| Kohler (Rehlko) | 5 years or 2,000 hours, limited | Parts, labor, and travel for the full term; 7 and 10 year upgrades offered |
| Cummins | 5 years or 2,000 hours, limited | 13, 17, and 20 kW models; Cummins lists 2 years for its 25 to 125 kW models |
| Champion | 10-year limited | aXis home standby generators; 2-year limited warranty on the transfer switch |
| Briggs & Stratton | 6 years | PowerProtect models: parts, labor, and technician travel; 10 years when bought through a Briggs dealer |
These are the standard terms in each manufacturer's own documents as checked in October 2026. Manufacturer terms change, and commercial or industrial units typically carry different coverage. Always verify the specific product's included warranty documentation at the time of purchase.
Keeping your manufacturer warranty valid
Three practices protect your warranty coverage over its full term:
1. Use an authorized dealer for installation. Warranties exclude damage caused by improper installation, and Generac requires warranty repairs to go through its authorized dealers. A licensed, authorized installer avoids a dispute over who caused a failure. See our installer vetting checklist for what to confirm before signing.
2. Complete annual professional service. Generac's warranty, for example, requires the scheduled maintenance in the owner's manual, recommends an authorized dealer for it, and asks for proof of maintenance. This service includes an oil change, spark plug inspection, battery load test, transfer switch test, and control panel review. Skipping it gives the manufacturer grounds to deny a claim. Keep service records.
3. Use authorized service for any repairs. If a component fails during the warranty period, have an authorized dealer perform the repair. Using an independent shop that isn't authorized can affect coverage on related components, even if the original failure would have been covered.
Extended service contracts
An extended service contract (sometimes called a service agreement or extended warranty) picks up where the manufacturer warranty ends, or fills gaps in what the standard warranty covers.
What they typically include:
- •Parts and labor for mechanical and electrical failures beyond the manufacturer warranty period
- •Annual maintenance visits (oil change, filters, battery, transfer switch test)
- •Priority scheduling for repairs
- •Some plans include emergency dispatch for failures during power outages
What they cost: it varies with generator size (kW), age, and what the plan includes, so get written quotes. Manufacturers also sell extended warranties through their dealers; ask what a manufacturer plan costs compared with your installer's own plan.
When a service contract makes sense:
- •You are approaching the end of your manufacturer warranty and want continued coverage
- •You travel frequently or have a second property where the generator runs unattended
- •Your generator supports a household with medical equipment and downtime would be serious
- •Your installer offers a plan that bundles the required annual service visit, since that service is required to maintain warranty validity anyway
Get the contract terms in writing before paying. Confirm whether the plan covers both parts and labor, and whether it includes annual maintenance or only repairs.
Home warranty add-ons
Home warranty companies offer generator add-ons as an ongoing subscription separate from both the manufacturer warranty and your homeowners insurance. They are usually sold as an add-on to a base home warranty policy, so ask for the add-on price in writing.
How they differ from the manufacturer warranty:
| Manufacturer warranty | Home warranty add-on | |
|---|---|---|
| Paid by | Included in purchase price | Monthly subscription |
| When it applies | During the warranty term (5 to 10 years, depending on brand) | Ongoing, renews annually |
| What triggers a claim | Defects and mechanical failure | Mechanical and electrical breakdown from normal wear and tear |
| Covered components | Manufacturer-specified list (engine, alternator, control board, etc.) | Company-specified list (varies; ask for the generator add-on schedule) |
| Acts of nature | Excluded | Excluded (covered by homeowners insurance instead) |
| Maintenance requirements | Annual service required to stay valid | Varies by plan; some require records |
The practical use case: once your manufacturer warranty expires (after 5 to 10 years, depending on brand), the generator has no remaining factory coverage. An extended service contract from your installer or a home warranty add-on fills that gap. A home warranty add-on is a reasonable option if you already carry a home warranty on your HVAC, plumbing, and electrical systems and want generator coverage under the same roof.
What to ask before buying a home warranty add-on:
- •Which specific components does the generator add-on schedule list as covered?
- •Is the automatic transfer switch included in the add-on, or only the generator unit itself?
- •Is there a per-claim cap or a total annual cap that might not cover a full control board replacement?
- •Does the plan require documentation of prior annual service visits?
Frequently asked questions
Is the workmanship warranty the same as the manufacturer warranty? No. The manufacturer warranty covers the generator unit itself against defects. The workmanship warranty is a separate promise from whoever installs it, covering their electrical and mechanical installation work. These are two different agreements from two different parties. Ask for both in writing before signing a contract.
Does the manufacturer warranty transfer if I sell the home? Generac's warranty, for example, stays with the original installation site when the home changes hands. Confirm the transfer terms in the specific product's warranty documentation. Some brands require a formal transfer notice to the manufacturer within a set window after the sale.
Does the manufacturer warranty cover annual maintenance costs? No. Annual oil changes, filter replacements, spark plugs, and the battery are owner expenses regardless of warranty status. The warranty covers defect-driven failures, not routine wear. Our maintenance cost guide covers what a professional annual service visit typically costs.
What happens if a covered part fails one month after the warranty expires? The manufacturer warranty offers no coverage after the expiration date. This is the window an extended service contract or home warranty add-on is designed to protect. If you have neither, the full repair cost is out-of-pocket.
Sources
Figures and rules in this guide were checked against these sources on October 11, 2026. Programs, prices, and terms change, so confirm the current details before you rely on them.