LCD say 170, but print head is 250+ and smoking  

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James AZ
(@james-az)
Active Member

During a PC Blend print, the printer stopped and the print head started smoking.  Now when set to PLA 215/60,  the LCD stops increasing current temperature around 170, but the print head continues increasing temperature.  Measured at 250+ and then it starts smoking the filament.

Posted : 15/03/2021 6:52 pm
Antonio da Catania
(@antonio-da-catania)
Moderator

it is very likely to be a thermistor issue.

better replace it and the heater cartrige too.

Parlo italiano...but I'm not an expert....
Posted : 15/03/2021 9:26 pm
karl-herbert
(@karl-herbert)
Illustrious Member
Posted by: @james-az

During a PC Blend print, the printer stopped and the print head started smoking.  Now when set to PLA 215/60,  the LCD stops increasing current temperature around 170, but the print head continues increasing temperature.  Measured at 250+ and then it starts smoking the filament.

If you have a multimeter, I would measure the internal resistance of the thermistor. The value should be at 25grad C. room temperature approx. 100kohms, internal resistance of the heating catridge about 14.4 ohms.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 15/03/2021 9:45 pm
James AZ
(@james-az)
Active Member

@karl-herbert

I have tested both old and new hotends and thermistors.  

At 25c: thermistors 100k / cartridges 14

Although I can not see a problem (burn) on the board, I have ordered a new one

Posted : 22/03/2021 8:06 pm
Louie Beardell
(@louie-beardell)
New Member

I’m having the same problem except mine says 140. I replaced my thermistor and heater cartridge and I’m still having this problem. Seems to be coming up a lot in the forum...

Posted : 16/04/2021 4:28 am
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