New MK3S kit build with Heatbed overheat problem.
Greetings,
I updated to the latest firmware 3.9.0-3421. It passed Wizard XYZ calibration and hotend and bed temps passes. The problem is that the the bed heat is always on. It heats upon switching on the printer and would not turn off to cool when already hot and restart the calibration wizard.
I can not proceed to "first layer" as the printer hovers, waiting for the bed temperature to raise. The bed temperature clearly raises past the 60 deg limit and overshoots to MAXTEMP error.
The thermistor accuretly reads the temperature ~131 deg but it is not detected or regulated by the printer control (PID?). The nozzle temp regulation works perfectly.
The thermistors (nozzle and bed) measure ~ 94KOHM. The wires appear intact and correctly connected to EMBY. I have re-uploaded the firmware and reset the calibration 3 times to no avail.
Thank you for any help.
RE:*SOLVED* New MK3S kit build with Heatbed overheat problem.
So it may help others the problem was the connction of the heatbed control wires to terminals 3-4 instead of 5-6 of the PSU which modulates on-off.
Thank you for reading my post and specially to Georgios, Prusa's tech support, for identifying my error.