A service contract is a separate document from the appliance or system it sits beside. It is an agreement with the company that sells it, and its terms decide what happens after the day you sign. Before you commit, read it the way you would read the spec sheet for a machine you plan to keep for years.
Start with the definitions
Look for the section that defines the covered item, the covered repair and the term. Words such as 'wear', 'normal use', 'pre-existing condition' and 'accessory' are often defined near the back. If a word matters to you, find its definition before you rely on it. Note whether the contract covers the whole unit or only named parts, and whether it lists exclusions by name.
Find the waiting period
A waiting period is the stretch after the contract starts during which some or all claims are not accepted. Check how long it runs, whether it applies to every part of the agreement, and whether it starts over if the contract is renewed or transferred. A waiting period is a plain term, not a sign that anything is wrong with the system.
Read the cancellation and refund lines
Most contracts describe how either side may end the agreement and how any unused portion is handled. Find out who may cancel, what form the request must take, how a refund is calculated and whether any fee applies on cancellation. Ask whether the refund method is written in the contract itself or only on the sales page.
Check the transfer rule
If you sell the house, the contract may or may not follow the system to the new owner. Look for a transfer clause. It usually says whether the agreement can move, whether a fee applies, whether the term changes and what paperwork the new owner must sign. Ask who keeps the signed copy after the sale.
Read how a claim moves
A contract usually says how to request service, who may authorize it and how the provider chooses between repair and replacement. Note the phone line, the written request method, the timing and any requirement to use a particular repair network. Keep the purchase record and a maintenance log, since the contract may ask for them.
Questions to bring to the sales conversation
Ask the seller to point to the clause behind each answer, not only to explain it in general. Ask what the contract does not cover that you might assume it does. Ask what happens if the system needs service during the waiting period. Ask whether a copy can be sent to you before signing, so you can read it at a table rather than at the door.
Use the published figures for planning
A contract term is only useful when you know how long the system itself is likely to last. The service life figures for major appliances are in the ranked list of major appliances, and each system page turns an install year into a planning date. Compare the contract term with that planning date, then decide whether the coverage matters for the years you actually plan to keep the unit.
Nothing on this page is a ruling on any particular contract. Read the document in front of you, and if a clause is unclear, ask the seller to explain it in writing before you sign.