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Need help with printer resetting.  

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Jazzviper1
(@jazzviper1)
Active Member
Need help with printer resetting.

I have had my Prusa Mk3S for two years. Two weeks ago I started a print but for some reason the print head locked all the way to the right and kept pumping filament. It made a big glob of plastic and when trying to remove it I broke the hot end thermistor wires again. I bought a pre-assembled hot end from Prusa and installed it. Now the printer won't pre heat. The bed will heat just fine during the self-test but when it gets to the hot end test it re-boots. It also re-boots when I manually try to pre heat it. I have checked all connections and plugs they are all correct as per Prusa specs. Any help would be appreciated.

Thank you.

Posted : 16/07/2022 3:58 am
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Need help with printer resetting.

If the printer resets when the nozzle heater starts to heat, I would consider unplugging the heater connector and trying again. 

If the next time the heater starts, you get a different error message, (Probably Thermal runaway) it would suggest that the extruder heater is faulty

Did you get the correct 24 volt heater?      if you accidentally got a 12 volt heater, you will be overloading the power supply... which may well cause a restart...

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 16/07/2022 6:41 am
Jazzviper1
(@jazzviper1)
Active Member
Topic starter answered:
RE: Need help with printer resetting.

I checked my order and the pre-assembled hot end is supposed to have the 24 volt heater. I have no way of knowing if it is correct.

 

Posted : 16/07/2022 6:23 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Need help with printer resetting.

If you have a multimeter you can check the heater resistance. 

If you don;t have a multimeter, the option of starting the printer with the heater disconnected will give you an idea as to whether the heater is the problem

as explained above

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 16/07/2022 6:44 pm
Jazzviper1
(@jazzviper1)
Active Member
Topic starter answered:
RE: Need help with printer resetting.

I tried unplugging the heating element. It went to pre-heat and when the bed reached temperature after a minute of holding bed temperature it gave me a "PREHEAT ERROR" but that was all.

Posted : 16/07/2022 6:50 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Need help with printer resetting.

but when the heater is plugged in, and you start a print, the printer resets when the heater is switched on...    
that suggests that there is a short circuit on the heater wiring / assembly. 

Please check the heater wires are not exposed and touching, or crushed. if you have a different heater it would be a good idea th try swapping the heater. 

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 16/07/2022 6:54 pm
Jazzviper1
(@jazzviper1)
Active Member
Topic starter answered:
RE: Need help with printer resetting.

It is a new unit, I can't see any damage to the wires anywhere. It must be a faulty heater. I presume I should contact Prusa about this.

Posted : 16/07/2022 7:04 pm
JoanTabb
(@joantabb)
Veteran Member Moderator
RE: Need help with printer resetting.

I would use Prusa Chat, available on the Prusa Shop page, the chat window appears about five seconds after the page loads

regards Joan

I try to make safe suggestions,You should understand the context and ensure you are happy that they are safe before attempting to apply my suggestions, what you do, is YOUR responsibility. Location Halifax UK

Posted : 16/07/2022 8:31 pm
Jazzviper1
(@jazzviper1)
Active Member
Topic starter answered:
RE: Need help with printer resetting.

Thank you for all of your help.

Posted : 16/07/2022 9:53 pm
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