Nespresso Preheat Timeout / Temperature Feedback Fault

Machine stays in preheating mode indefinitely; ready lights never come on

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Failed NTC sensor, Heater not reaching temperature due to scale, Control board not reading sensor, Loose sensor connection

Safety first: Unplug and cool before opening.

Steps:

Descale the machine to improve heating efficiency.
Open the housing and check the NTC sensor connection to the thermoblock and PCB.
Measure NTC resistance and replace if out of spec.
If sensor and heater are good, replace the main control PCB.

Medium 3/5

NTC Temperature Sensor / Main Control PCB

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