Mosfet issue, E0 heater heats up on startup, E1 blows fuses



  • I just bought a new Duet2 (2.02) from Filastruder about a week ago and setting it up in the new Venturi 3D prototype for ERRF, but ran into quite an issue. I had plugged in some 24 V fans, and started to smell burning on startup.

    So I unplugged the printer, then found I blew one of the 7.5 Amp fuses, replaced it, but now the E0 heater just turns on immediately upon startup. After doing some board research, seems a Mosfet is bad, but the other heater doesn't do this.....however

    I was hoping to use the other heater, but after trying to set that up, it blows another fuse when turning it on to heat up.

    I don't know if I can do anything to get this board working before ERRF (I know, last minute is a bad thing)

    Anyone have advice?

    (The good news that I'll be 2 booths away from the Duet booth at ERRF)


  • administrators

    Check the resistance of your hot end heater between the wires where they plug into the Duet. If it's blowing mosfets and fuses, chances are there is a short in the heater or your wiring. Be especially careful if you are trying to use a common VIN+ wire to the heater and fan(s).



  • Does each E0 and E1 heater have a separate mosfet?


  • administrators

    @technosworld said in Mosfet issue, E0 heater heats up on startup, E1 blows fuses:

    Does each E0 and E1 heater have a separate mosfet?

    Yes.


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