Mini2 Preheat issue

Mini2 issue…
I connect to printer. OK. (Mini 2 Ready)
As soon as I select Hot End Pre-heat the printer shuts down and reboots.
Thanks for thoughts

If the thermistor is not connected (reading temp 0/0 on the screen) it will shutdown immediately when attempting to heat up.

Or could be heater core wires shorted.

If you do it through the terminal/usb connection, do you get more a message in the terminal from the machine before the reboot?

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Same from machine. Thanks
Will check heater and thermistor at the connector block.