Have you updated your firmware? On the first batch(es) of printers that went out the firmware used an incorrect PID profile for the new temperature sensor which might be what is causing the problem for you.
edit: Oh, and do a factory reset after the firmware update just to make sure the new settings take effect.Edited by Guest
Is the temp overshooting when you set it to 260? At what temp does it alarm?
Just check if any of the connections are loose and the temp sensor is fully inserted and not loose.
I only heat mine up to 230 or so when I do atomic pulls and it works just fine.
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