GeeeTech E180 No Printing - Code: Error Abnormal Temperature

[stampa7]

GeeeTech E160 HardwareV.1.6 no longer prints.
Code: Error -0- Abnormal temperature.
The temperature is shown in the display, but the nozzle does not get hot.
Thermistor shows 5.26 kΏ by room temperature.
Nozzle externally heated via bypass from the laboratory power supply, 3 D printing is possible.
What could be the cause.
I have no idea what to do about it.
Thanks

[Morgest]

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