Thermistor issues after update
I have a MK3, been great for years, zero issue. I updated the firmware to the latest and tried to print something and it failed, Thermal Error, something like that, the alarm for it is insane btw. So I assumed that after all these years the thermistor had failed, I did the selftes thing and it stopped on the Heater/Thermistor not connected. So I replaced the thermistor. Before I bundled up the wires I did a self test and all was ok, passed every test. Bundled up the wires nice and neat like in the assembly instructions. Turn it on, self test fails. same message Heater/Thermistor not connected...
wires are all checked, took everything very carefully out and out it all back, read some post somewhere about a firmware issue and thermistors, but flashing back to previous firmware didn't do anything either. same message no matter what I do. I did the calibration thing for the hotend and it fails and said thermal error, once it said thermal runaway (but it hadn't even started to heat)
of course this was the first time anyone asked me to print them something, I was like sure, I can print anything...I was printing just fine till three days ago...
any help out there for the old MK3?
RE: Thermistor issues after update
nothing, nobody knows how to fix this...geez can someone from Prusa help?
RE: Thermistor issues after update
It's a little hard to tell what's going on from your description. Did it ever work with the new thermistor? Like when you ran the self test, did it heat all the way up without an error or was it just a test for electrical connection?
Have you tried reinstalling the firmware and factory resetting the machine, then rerunning the thermal model calibration? That's what they told me to do when I had a similar problem. If that doesn't work, try installing the old firmware and factory resetting the machine, and run the thermal model calibration again.
When that didn't work, the only thing that fixed it for me was replacing the EINSY Rambo board.
It's easy to short the thermistor or heater when cleaning the hotend with pliers so my guess is I caused minor electrical damage at some point and the new firmware somehow triggered the problem. Maybe by detecting the problem, but then I don't know why downgrading and resetting didn't fix it. Maybe the new firmware somehow pushed the boundaries of the electronics in a way that would normally be fine but turned the minor damage into permanent damage.
I hope you find a fix!