Most appliance warranties are written for the person who bought the appliance, and that is often not the person who lives with it now. Before you need a repair, spend one visit finding the paper and turning it into something you can use from your phone.
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Find the model and serial numbers first
The model and serial numbers are usually on a label inside the oven door frame, behind a drawer, or on the back or side of the unit. Photograph the label, the front and back of any paper warranty card, and the receipt if it exists. Put the photos in the shared folder where you keep her other papers, and name the folder so you can find it at 2 a.m.
Check whether registration was ever done
Some warranties only apply if a registration card or online form was completed after purchase. The manual or the manufacturer's support page will say whether registration is required. If it was never done and the form is still allowed, do it on the visit, using her name only if she is the owner of record and agrees to it.
Read the covered list, not the headline
Look for three things. First, whether the warranty covers parts only or parts and labor, because a covered part with an uncovered technician visit can still cost you the whole call. Second, how long the coverage runs from the original purchase. Third, the exclusions, which often include damage from misuse, cleaning or repairs by someone the manufacturer did not authorize.
Know who must make the call
Some warranties require you to call the manufacturer's line first and use a listed service company. Calling an unlisted repair person before that step can end the coverage. Write the support number into her phone under a clear name, such as Stove Warranty, so the right call is the one you make first.
If the store offered an extra plan
An extended plan sold at the register often overlaps what the manufacturer already covers. Read what it adds, how you cancel it, and whether the cancellation terms are on paper you can keep. Ask the store for the full contract, not the summary card.
What to do tonight
Find the model number, take the photos, and ask her which warranty papers she still has and where. If she cannot find them, ask whether the installer or the store kept a copy. The list of checks behind this guide is on the Sources page.