The only warranty term on this site
The QDD-400G-SR8 model page states a warranty of 1 Year, from that model's own detail page, and that term applies to that page only. It is not the family's warranty, and it is not the site's warranty, and it must not be read as either, because no other model page states a warranty term, and no site-wide warranty is evidenced anywhere in the material used here. A buyer who reads that term as a general warranty will be disappointed when another model's terms differ, and this page exists to prevent that misreading.
What to ask, for any other model
Ask for the warranty term for the exact model, in writing, with its meaning: what it covers, what it excludes, how long it lasts, from when it runs, and how a claim is made. Ask whether it covers the module alone or the installation, whether it covers defects alone or failures in service, and whether it requires return, replacement, or repair. A warranty term that is not written down, with its meaning, is not a term a buyer can rely on, and a buyer who orders on an unwritten warranty has ordered on a hope.
What to confirm, in the inquiry
Name the model, the quantity, and the market. Ask for the warranty term for that exact model, the minimum order quantity, the lead time with its meaning, the payment and shipping terms, the specification, and the certificates that apply to your market, by name, with documents attached. Confirm the warranty in writing, before payment, because a warranty confirmed after payment is a warranty that cannot be relied on.
Before payment, confirm the minimum order quantity, lead time, payment, shipping and warranty terms for your order. Certificates are available upon request.