this post was submitted on 07 Aug 2024
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Hi

A couple of days ago the hotend wouldn't heat up and i got a couple of errorcodes/warnings in the display. The bed heats up just fine, so i ordered a new hotend parts (heater, thermistor and a new aluminum block). Changed all of this, but still the same error. I can se that the thermistor works because it changes values in the display when touching the thermistor-end. Any good ideas why the heater doesn't heat?

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[–] UncleStewart@sh.itjust.works 1 points 1 month ago

Home, and done some measuring.

  1. measurement:
    Just started the printer: 1,24 VAC
    Preheating the nozzle: 0,00 VAC
    After error beep: 1,24 VAC
  2. measurement:
    Just started the printer: 1,57 VAC
    Preheating the nozzle: 0,00 VAC
    After error beep: 1,57 VAC

Old heater: 13,6 Ohm
New heater: 14,6 Ohm

So, no power to the nozzle heater. Now, how to verify the mosfet?