What happened?
The printer is showing the message "Check the print head thermistor wiring for possible damage."
Error name: Hotend mintemp error
Error code: #26208 (MK4S) #13208 (MK4) # 27208 (MK3.9S) #21208 (MK3.9) #31208 (CORE One)
This error is shown when the printer's nozzle temperature drops below 5 ºC at any point during the print . If this happens during a print, the print will be stopped.
How to fix it?
Extruder inspection
This error is usually caused by the hotend thermistor.
Access the LoveBoard. Check if the thermistor is connected correctly and if there is no damage along the cable length.
If you have a multimeter, it is possible to check the resistance of the cables to verify if they are damaged. For that, use our Multimeter usage guide.
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xBuddy board inspection
Make sure that the Loveboard main cable is correctly connected to the xBuddy board.
14 comments
Removed the hot end thermistor and it read 113k Ohms, well within the normal range.
Tested the NTC thermistor, and that one read 115k Ohms, also normal range.
Wiring on both thermistors shows no damage, and did not see any intermittent readings when measuring the resistance.
Checked Love board cable to Buddy Board, and both ends were secure.
After reseating the two thermistor cables and reassembling everything, the printer booted up fine and no longer threw the error on any attempt to heat the nozzle.
Unfortunately this leaves the printer in a suspect state, and prints are still failing (nozzle clog/under extruding). Tried to contact support, but the link just kept sending me back to the top of the page, and doesn't allow any other report to be filed.
Leaving the side panels off of the nextruder is allowing printing to happen, but this connection to the Love Board is not very tight.
Took the Thermistor out and inspected visualy. No damage to be seen.
Measuring it with the Multimeter, i get 87 kOhm at ca. 30 degree celsius which seems normal for a ntc 100k thermistor.
Any ideas what could be wrong?
Environment is not responsible, since room is at 20C.
During pre-heating, I observe an increase of the temperature of nozzle and plate; heating of the nozzle stalls at 175 C. Error is triggered.
During a purge filament process, I observe nozzle T of 215 C. No error triggered.
Heaters are clearly working; temperature indications are both present.
After a few resets, the temperature indication of the nozzle is 0C; points to the hotend thermal sensor.
Disconnected hotend thermistor from the love board and measure its resistance: 50 to 60 Mega Ohms.
What causes the wiring or the thermistor to break ?
Anyone nail down the exact issue? All wires are in good shape, connection all seem fine, haven't broken out the multimeter yet, but thats next on the list.
I can't say if this is definitive proof of the issue, however it's highly unlikely that it's an issue with the heating element and that's the only other component related to this that may be malfunctioning.
EDIT to add: the temperature of the printer's surroundings isn't a factor, as the printer's in a climate controlled area.