Claims denied for 'improper maintenance' that was never defined at signup

Home warranty contracts require homeowners to maintain 'proper maintenance records' for covered systems, but never specify what maintenance is required, how often, or what documentation is acceptable -- then deny claims by citing 'lack of maintenance' when a system fails. A homeowner who never received guidance that their HVAC required annual professional servicing discovers at claim time that the $300 annual tune-up they skipped is now the justification for denying a $5,000 repair. This persists because vague maintenance clauses give warranty companies a universal escape hatch for expensive claims, there is no regulatory standard requiring companies to proactively communicate maintenance requirements at policy inception, and the burden of proof falls entirely on the homeowner.