Abstract: Sensors are located on first and second regions of a heat sink, with a portion of the heat sink interposed between the first and second region sensors. The heat sink is connected to a component by an attachment that conducts heat from the component to the heat sink, and a third sensor is located on the component or the attachment with a portion of the attachment disposed between the third sensor and the first and second heat sink region sensors. Temperature readings from the sensors are compared to identify a failing one of the heat sink, the attachment portion, and the component with respect to heat conduction, which includes identifying the interposed heat sink portion as failing in response to a divergence between temperature inputs from the first and second heat sink region sensors. Rate-of-rise temperature readings may also be observed and compared, including to historical values.

Abstract: Where an attachment means connects a heat sink to a system component, heat is thereby conducted to the heat sink from the component, a temperature sensor is located on the heat sink and another on the component or the attachment means, a portion of the attachment means is disposed between the sensors. Temperature readings from the sensors are compared to identify a failing one of the heat sink, the attachment means portion, and the component, with respect to heat conduction. Corrective action may be identified, and self-power means may also be provided to supply operative power. A wireless output circuit may be provided. Multiple heat sink sensors may be provided in any element. Rate-of-rise temperature readings may be observed and compared, including to historical values.