A warranty covers defects, not wear and tear or damage. It typically states a period from invoice or installation, what is covered such as parts, labour or both, and what voids it. In commercial refrigeration, many manufacturers offer a different period for the compressor than for the rest of the unit, so read each part of the warranty separately.
Common conditions include installation by an authorised person, use of a suitable power supply, adequate ventilation, regular cleaning of the condenser, and use for the intended purpose. Common exclusions are damage from voltage fluctuations, transport, misuse, glass breakage and consumables. Keep the invoice, warranty card and installation record, and register the product if the manufacturer asks.
A bakery in Nagpur whose display cabinet fails in the first year would call the supplier with the invoice and serial number. If the technician finds a choked condenser and a burnt fan motor from months without cleaning, the claim could be disputed; a stabiliser and cleaning records strengthen the owner's position.