Onelink warranty for smoke & CO alarms
The short version
Onelink doesn't cover everything, but keeps whole alarm (excluding batteries) covered to 5 years. That full coverage is the same as most of the 4 brands we compared, which typically cover nothing in full. You don't need to register to get this coverage.
From Onelink's published warranty, checked October 2026.
What's covered
Full coverage: everything, parts and laborPartial coverage: some parts only, you usually pay labor
Purchase5 yrs10 yrs+Full: NonePartial: to 5 years
- Partial coverageWhole alarm (excluding batteries)5 years
The fine print, decoded
What it leaves out
- Normal wear and tear
- Water damage
Good to know before you buy
- Covers the original buyer only. Keep your receipt; proof of purchase is required.
- Batteries that came with the alarm are not covered.
- First Alert may send a new or remanufactured replacement.
How other brands compare for smoke & CO alarms
- 1. First Alert65/100 · Full: 10 years
- 2. X-Sense65/100 · Full: 5 years
- 3. Kidde35/100 · Full: None
Where you buy it matters
How long stores give you to return it
Longest return window first, for smoke & CO alarms.
- CostcoMost itemsNo fixed deadline
- Lowe'sMost items90 days
- The Home DepotMost items90 days
- WalmartMost items90 days
- Ace HardwareMost items30 days
- Do it BestMost items30 days
Show all 7 stores
- Best BuyMost items15 days from delivery
From each store's published return policy, using its rule for smoke & CO alarms where it has one. Member and holiday extensions aren't counted. Check yours before you buy.
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