Persistent Thermal Errors
Our printer is about 3 yrs old... We've never had a problem with it. Starting yesterday, it began giving a "Thermal Error" code during prints. Now I can't even get it to start a print without throwing the code. I started out with the most obvious issues... cleaned the print head, blew out all the fans, and checked obvious pinch points in the wiring. Everything looks normal. The attached videos show what its doing. Bed and Nozzle get up to temp, then when the print head starts moving around, temp starts jumping around. I suspect a loose connection somewhere. Can someone give me guidance on where to look?
We have an i3 mk3s+
RE: Persistent Thermal Errors
Hello Aaron, Watching the video makes me think of a loose connector or a broken wire on the thermistor. There is no reason that the temperature should bounce around unless there is a broken wire.
Raise your head and heat up the head. No need to heat the bed. Move the cables from the head to the einsy and see if the temperature fluctuates. If this works, then you have to look closer at the print head for damage to the white thermistor wires. Thermistor will go to a lower resistance when it gets hotter, showing a lower temperature means that the wires are breaking or showing a higher resistance. Thermal cutoff is a safety feature. I had my print head melt before the thermal software was added on a 4 month old printer.
RE: Persistent Thermal Errors
Came across this link while looking at bug reports today. May be useful information. FWIW, I have a thermistor fail on a 4 month old printer and it melted the head and the filament ruined the steel plate as it coming out like water. Temperature on the display temperature was over 50 degrees lower than what I measured on the head with a thermocouple.