What is the problem?
the heater head temperature drops to zero during a print.
What did you already try to solve it?
the wiring may be loose or the connections faulty.
Have you tried running in safe mode?
no
Did running in safe mode solve the problem?
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Systeminfo Bundle
You can download this in OctoPrint's System Information dialog ... no bundle, no support!)
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Additional information about your setup
OctoPrint version, OctoPi version, printer, firmware, browser, operating system, ... as much data as possible
the heater element feed back may be the problem?
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