What is the function of the fuser unit in an Epson printer, and why is it related to this error?

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Grade: Education Subject: Support
What is the function of the fuser unit in an Epson printer, and why is it related to this error?
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The fuser unit is responsible for melting the toner particles onto the paper, creating a permanent image. It consists of a heater element, rollers, and a temperature sensor (thermistor). Error 602-003 IR 5000 arises because the printer's control system isn't receiving accurate temperature readings from the thermistor or the heater isn't functioning correctly, preventing proper toner adhesion.