ERR: MINTEMP - help needed 🙁  

RE: ERR: MINTEMP - help needed 🙁

that's the Hot end Thermistor

regards Joan

RE: ERR: MINTEMP - help needed 🙁

You could give it a try to solder this, but it is the side of the thermistor. Will be hard or impossible. 
But if succesfull, you don't have to wait with printing, untill a new one arrives. 
They are not expensive and easy to exchange. 
PS: (I had to do this last week: could get the screw loose when cold, but the thermistor did not want to loosen from the hotend, so heated the hotend up till 200 degrees, shut the printer off, and while cooling removed it very easy.)

RE: ERR: MINTEMP - help needed 🙁

Since I get this error, I'm not able to access the printer's menu. It is possible to substitute the thermistor with a resistor to be able to move the axis and heat the hotend?

RE: ERR: MINTEMP - help needed 🙁

a 100k resistor will let the printer start, but  as soon as you try heating the hot end you  will get error messages, and there will be no control of the hot end temperature

regards Joan

RE: ERR: MINTEMP - help needed 🙁

Hello Joan,

Posted by: @joantabb

a 100k resistor will let the printer start, but  as soon as you try heating the hot end you  will get error messages, and there will be no control of the hot end temperature

regards Joan

Thanks, worked well I can remove the thermistor, now waiting for the delivery...

RE: ERR: MINTEMP - help needed 🙁

I think I have the same problem. When cleaning the gooped-up filament, I think I pulled one of the blue wires too hard. Where did you get the new part from? Is there any guide on how to change it?

RE: ERR: MINTEMP - help needed 🙁

Posted by: @daddyfixit

I think I have the same problem. When cleaning the gooped-up filament, I think I pulled one of the blue wires too hard. Where did you get the new part from? Is there any guide on how to change it?

Here is the manual https://help.prusa3d.com/guide/how-to-replace-a-hotend-thermistor-mk3s-mk3s_131675  
Jump directly to step 7. (unless you want also to change the cable up to the PCB) 

NB: I did this a couple of weeks ago. The thermistor would not loosen, stayed stuck because of some filament around it. I found this advice to combine with the the manual: 
- Take of the sock (if you use it) so you can easily reach the hotend block
- heaten the nozzle upto to 200 degrees. 
- shut printer off + disconnect power!!
- unscrew the grub screw
- take the thermistor, because it is still hot (be carefull) it will easily come off.
- new thermistor in.
- fasten screw (just enough, there is no tension on it, just thermal contact).

RE: ERR: MINTEMP - help needed 🙁

Posted by: @eef

 

Posted by: @daddyfixit

I think I have the same problem. When cleaning the gooped-up filament, I think I pulled one of the blue wires too hard. Where did you get the new part from? Is there any guide on how to change it?

Here is the manual https://help.prusa3d.com/guide/how-to-replace-a-hotend-thermistor-mk3s-mk3s_131675  
Jump directly to step 7. (unless you want also to change the cable up to the PCB) 

NB: I did this a couple of weeks ago. The thermistor would not loosen, stayed stuck because of some filament around it. I found this advice to combine with the the manual: 
- Take of the sock (if you use it) so you can easily reach the hotend block
- heaten the nozzle upto to 200 degrees. 
- shut printer off + disconnect power!!
- unscrew the grub screw
- take the thermistor, because it is still hot (be carefull) it will easily come off.
- new thermistor in.
- fasten screw (just enough, there is no tension on it, just thermal contact).

 

My new thermistor arrived just yesterday (almost two weeks, yay).

I have read a lot about the right process and there is a comment in the official Prusa process page: you need to do a Thermal model calibration after thermistor changed.

Anyway, my printer back to the business, working again