Heating apparatus including a plurality of heat generation members, fixing apparatus, and image forming apparatus

A heating apparatus comprising a plurality of heat generation members, a plurality of contacts, a substrate on which the plurality of heat generation members and the plurality of contacts are mounted, and a first switching unit,

• wherein the plurality of heat generation members includes a first heat generation member, and a second heat generation member and a third heat generation member, a length of the second heat generation member and a length of the third heat generation member are shorter than a length of the first heat generation member in a longitudinal direction of the substrate,
• wherein the plurality of contacts includes a first contact to which one end of the first heat generation member is connected, a second contact to which one end of the second heat generation member and one end of the third heat generation member are connected, a third contact to which another end of the third heat generation member is connected, and a fourth contact to which another end of the first heat generation member and another end of the second heat generation member are connected,
• wherein the first switching unit is configured to bring an electric path between the second contact and the fourth contact into one of a connecting state and an open state, and
• wherein the first contact, the second contact, the third contact, and the fourth contact are provided on end sides of the substrate beyond the first heat generation member, the second heat generation member, and the third heat generation member, in the longitudinal direction of the substrate.