A service contract covers faults, not the ordinary upkeep that keeps a unit running between visits. Many contracts leave routine supplies and light care with the owner, and a denied visit can follow from a missing supply or a skipped task. Write down which items are yours before the next visit comes due.
What counts as a consumable
Consumables are the parts and supplies that wear out on a schedule or are used up in normal running. Examples include filters, batteries in detectors, cleaning agents, lubricants, seals and gaskets that are replaced rather than repaired, and bulbs. The contract may use other words, so match the list to your unit rather than to a general idea.
Read the words that assign the duty
Search the contract for maintenance, wear, consumable, routine, normal use, and owner responsibility. Note whether the contract says what the owner must do, how often, and what proof must be kept. A duty stated in general terms is harder to prove later than one stated with a schedule.
Keep a supply and service log
Record each supply you buy and each task you complete, with the date it was done. Keep the receipts with the log. If a visit is refused for a missing task, the log is the record that shows what was done and when. A log kept only in memory is not a record.
Ask what happens when a duty is missed
Ask whether a denied visit states the missed duty in writing, whether you can cure it before a repair, and whether a late task voids coverage for that part or for the whole contract. Ask the same question about a supply the contract says you must provide but does not describe.
Check the duty when the unit changes hands
If the unit is sold or the home changes owners, ask who inherits the maintenance duty and whether the log transfers. The transfer clause and the maintenance clause should match. If they do not, ask in writing which one controls.
Where the state rules fit
Your state page on this site names the regulator and the statute or program, and says whether a roster is published. The page restates the rules in plain words, but the contract wording decides what you must do, so read both before the next visit comes due.