OVERVIEW
This is the original PTC (Positive Temperature Coefficient) Heating Module spare part.
The module is installed inside the square electronic box of Roborock’s S7 MaxV Ultra / S7 Pro Ultra Empty Wash Fill Dock Dryer Module (see images).
PTC (in general) is a type of resistor whose resistance increases with temperature. PTC resistors are commonly used in applications such as overcurrent protection, temperature sensing, and self-regulating heaters.
Note: Such procedures (replacing internal parts) are supposed to be performed by licensed technicians, laboratories, or at least individuals with a background in the field.
VIDEO DEMONSTRATION
A general explanation of how PTC works, in the video below.
