Hotend stops heating at around 40 degree celcius (1 reply)

Hi,

I'm trying to create a simple setup with an extruder, a hotend and a fan (all components of the Prusa MK3S) using RAMPS 1.4 and the Marlin software. Unfortunately, the attempt to set a temperature for the hotend is always cancelled at around 40 degrees. (I also use the thermistor on the Prusa hotend here). Does anyone have any idea how I can get the hotend to work?

Many thanks for your help