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Yes, this is not a natural situation.
And the proposed solution is to carry out some diagnostics.
At the moment, I am not sure whether it will solve the problem.
But it is worth it.
I will help you if you want.
On the forum I help to use the rod, I don't give fish. Geeetech Prusa I3 M201 Dual extruder Mixcolor 3D printer,bought 2017-12-19, already built, in the cognitive and improvement phase Geeetech filament, ABS only Geeetech 3D WiFi Module for 3D Printer, bought 2018-04-15, He got a new life, and still lies in a drawer. Positively frenzied customer of Getech Technology.
hello, I have the same problem,
at startup, the panel displays 254/0 - 144/0
while the bed and the nozzle are cold.
So impossible to start an impression
If I unplug the bed and / or the nozzle and their thermistors from the motherboard, I have the same problem ...
I also checked the thermistors, they are OK.
We will say a motherboard problem but I do not know how to identify it.
It was not a problem of sensor or connection but a problem of motherboard. I changed the motherboard and everything is in order. With the same sensors and even connections.