Possible scale on heater
The heater is the problem.
You have to change it.
Or you can leave it like this.
Answering an OLD but still relevant qustion -- Replacement of the NTC thermistor (Nt Sensor, 5232105100) is possible, technically. The part is cheap, about $14. HOWEVER, be aware the thermistor is epoxied into the steam generator housing. So replacement is non-trivial. It's far less trouble to just spring for the cost of the whole generator. Buy new o-rings, too, as the old ones eventually leak and cause the generator frame to rust.
Needs new heater .....
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