I recently upgraded my UMO to the Heated Bed Plate and while I had everything apart, I discovered a lot of things had come loose over the years.
Some of the electronic terminals needed a half twist to be snug again.
I also had the two back cover pieces to the rods come apart...the nut was still on the thread but it wasn't a lot of fun to put back together!
Good luck!
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zoev89 73
I would check if there is not a half loose wire in the temperature sensor or to the connection to the board. If I am not mistaken if it can not read the amplifier it keeps the old value. Since you say when homing it changes that makes me think it is a half loose connection.
Not very scientific advise...
Wiggle a bit with the cables to see if the temperature readout remains the same.
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