Hot end thermistor always reads zero
On the same day that I upgraded to the newest firmware, my hot end always shows zero degrees celcius. The printer worked after installing the firmware. I do not think that it is the firmware, but I did flash an older firmware and still have the same problem.
The problem started, I think, when I was changing the nozzle to a different size. I assumed that maybe I somehow damaged the thermistor. So confident I was that this was the problem that I tried to order one off the Prusa site but they were out. So I ordered one from Printed Solid. I plug the new thermistor into the board before installing it and I have the same problem. I swap the heat bed and hot end thermistor cables, same problem. Any thermistor that I plug into the heat bed board connection works just fine. Any thermistor that I plug into the hot end board connection reads zero. And obviously I have a mintemp error. The original hot end thermistor has a resistance of 109K. I checked all three fuses and they are good.
Hopefully I posted this in the correct spot on this forum and hopefully someone can help me. I don't know what else to try and suspect the controller board.
You have made most of the tests we would expect. Take this to Prusa Support.
Log into your Eshop account, navigate to support and live chat is at bottom right in most browsers. If not you may need to disable your ad-blocker temporarily.
Cheerio,