Most commercial kitchen manufacturers (Hobart, Vulcan, Rational, Hoshizaki, True) require registration within 30-90 days of install for full coverage. Standard parts-and-labor windows are 1-2 years; compressors, motors, and tanks often carry 3-7 year extended terms contingent on registration.
What gets a claim denied: missing registration, no proof of professional install, no PM service records, and use of unauthorized service providers. The fix is simple but tedious — register every new asset on day one, keep the receipt, and log every PM visit against that asset.