Medisana Overheat or Power Supply Intermittent Fault

Humidifier shuts off unexpectedly after a short time, even with sufficient water.

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

Blocked air vents causing overheating, Failing internal power supply, Loose internal connectors, Faulty overheat sensor

Safety: Unplug before inspection.

Ventilation: Ensure the unit has adequate space around it and that vents are not blocked.
Clean dust: Remove the cover and gently vacuum dust from vents, fan, and PCB area.
Check connectors: Inspect and reseat connectors between the power input, PCB, fan, and transducer.
Sensor replacement: If the base temperature sensor is faulty, replace it with the correct NTC sensor.
Power board: If the unit still shuts off randomly, the power supply or main PCB may need replacement.

Medium 3/5

Base NTC Temperature Sensor

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