During a print on an X1C I got an error message saying that the micro lidar was dirty & needed cleaning. Weirdly, the toolhead was still moving as if it were printing, but no filament was coming through. I cancelled the print, cleaned the micro lidar, switched the machine back on, and now the hot end temperature on the display is always around 255 degrees, with no error messages displayed. It shows that temperature immediately after switching the machine on, and for multiple hotends so I know it’s not those that are the issue.
I’m guessing something has short-circuited, but I don’t know what with any certainty. I would guess the th board. Has anyone else had similar issues and know a fix or a test to confirm what has malfunctioned?
I’ve raised a ticket with Bambu but not heard back in a couple of days. I’m under time pressure to meet a deadline, so I could use any help I can get.
sorry for Previous Post
I have the same problem, for me it looks like that the temperature is constantly 209-210 degrees and I do not want to fall below this value, when I set 300 degrees, the temperature increases to 300 and finally the hotend is about 100, I also checked other hotends it did not change anything, I have a spare board th board v9 and I replaced it without effect… I see that you have a similar problem, check if you also heat up to 300? I have no error, and after turning on the printer it immediately turns on hotend fan and indicates 209 degrees even though it is cold, even with a heater! also check if the heater will report a mistake? the temperature will drop to 0?
if you disconnect the thermistor from the board, will you still have 255 degrees and no error? Because disconnecting it doesn’t cause an error in my case
Your problem sounds very similar to mine. I disconnected the whole hotend from the toolhead and it still showed at 255 degrees. It’s what makes me think it’s a short circuit of something else, some component has failed causing a voltage to be sent into whatever receives the thermistor signal. I purchased a spare TH board, FPC cable and extruder board today, I’m hoping one of them will solve it.
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I only replaced this small extruder plate into which you plug the fan, sensors, etc. but it did not help, let me know how you will be able to solve the problem, thank you
I had another look at it today and am more confident it is the TH board. I unplugged the micro lidar and plugged it back in, now I’m getting a micro lidar offline error whether it’s attached or not.
Regardless of that, the hotend temperature now is always 13 when you turn it on, and then drops to 11, sometimes then hitting zero. I know the room is much warmer than that though.
I tried setting the hot end temperature manually and nothing happened. I did it with and without the micro lidar attached and saw the same behaviour both times. Hopefully the board will be here in a couple of days.