BREVILLE BARISTA PRO BES878 Water Not Heating

ThermoJet Heating Assembly

The ThermoJet is a thick-film heater where electrical energy is converted to thermal energy via resistive traces. Over time, the extreme thermal expansion and contraction cycles can cause micro-fractures in these traces, leading to a permanent open circuit. Once the trace is broken, the component can no longer generate heat, even if the control board is sending the correct voltage pulse.

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Thermal Cut-Out (Fuse)

This is a non-resettable safety device mounted to the heating assembly designed to protect against catastrophic thermal runaway. If the element exceeds a specific temperature threshold (typically 192°C or 216°C), the internal eutectic pellet melts, causing a mechanical separation of the contacts. This permanently interrupts the power supply to the heater to prevent a fire or steam explosion.

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NTC Thermistor Sensor

The NTC (Negative Temperature Coefficient) sensor provides real-time resistance feedback to the PID controller to manage water temperature. If the thermistor's internal ceramic bead fractures or its wiring harness fails, the PCB loses the ability to monitor the heater's temperature. For safety reasons, the control logic will default to an 'off' state for the heating circuit to prevent unregulated heating.

SKU: SP0001479

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