PREHEAT ERROR
The bed temperature comes up to 60 and holds.
When the Extruder temperature reaches 170 the heating process shuts down. I get a PREHEAT ERROR.
I’ve checked all the cables and they are in the correct locations.
The temperature reads fine in the display , until it reaches 170, then the target temperatures go to zero
and the Display reads the temperatures until they reach room temperature.
RE: PREHEAT ERROR
Sounds suspiciously like a bad thermistor: they heat up then fail open; hence temps rise then at some point drops to zero. And, the failure is intermittent: when it cools down, everything is fine again. But a closer inspection will usually reveal the 25c resistance is not correct.
Anyway - order a new thermistor from Prusa ... that way you get the proper cable length and termination. Or order from E3D, but you'll probably need to adjust lengths and connector.
RE: PREHEAT ERROR
Try PID calibration; if the issue persists then do the same thermistor tests.