What does an extended warranty cover on a furnace or an air conditioner?
Typically, an extended warranty covers the failure of a part or component of the product due to the malfunction of the unit or one or more of its parts or components. The extended warranty is on the furnace, boiler, or air conditioner and not on accessory components not included as part of the equipment. Examples of accessory components:
… any item not included in the ‘box’…
Maintenance agreement benefits are provided for the systems for which maintenance is provided.