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D. Eichenbaum
(@d-eichenbaum)
New Member
Odd Temperature Problems

I have a Prusa i3 MK3s+ with a MMU2s.  I can sometimes preheat the hotend and bed.  However, when I load filament into the MMU2s and try to heat them neither will heat and eventually I get the "Preheat Error" message.  Occasionally if I try to preheat the printer's temperature will rise and it will reboot itself.  If I preheat and then load filament and change temperature, the temperature of the hotend and print bed slowly fall back to room temperature.  Letting the printer sit for several hours seems to restore heating function until I load filament again.  I'm thinking it might be a power supply issue, a mainboard issue, or a problem with the MMU2s. Can anyone help diagnose?

Thank You!

 

preheat error

Posted : 21/09/2021 5:56 pm
D. Eichenbaum
(@d-eichenbaum)
New Member
Topic starter answered:
One other symptom...

When I finally manage to load filament, the temperature of the bed and hotend begin to drop from their stable 215/60 degrees.  I then get a thermal runaway message.

Help!

Posted : 21/09/2021 6:17 pm
Diem
 Diem
(@diem)
Noble Member

Intermittent errors are always the hardest to diagnose.

First check all the plugs on the Einsy board, pull and reinsert all of them.  This should fix any that have shaken loose and break any corrosion that might have built up a resistant layer...

With the printer switched off move the X and Y axes by hand; are they smooth? Does any of the wiring snag or pull?

Do you have a multimeter?

Cheerio,

Posted : 21/09/2021 10:12 pm
D. Eichenbaum
(@d-eichenbaum)
New Member
Topic starter answered:
More problems

Today, the printer will start heating the nozzle and bed, get most of the way to print temperature, and then stop heating.  The machine will gradually cool until it beeps and says "preheat error."  Is this symptomatic of a bad power supply or a bad mainboard?

Posted : 22/09/2021 6:09 pm
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