Short-To-Ground when turning on heaters



  • I get the following errors when I turn on the heaters (bed OR extruder)

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    The board itself flashes a few times on and off. In standby mode my Vin is around 24V, but when turning on any heater it goes to 0 immediately.

    I don't have any other problems with the board. The temperature transistors work perfectly, the motors work, homing works. I just can't get the heaters to work



  • @nerdiator said in Short-To-Ground when turning on heaters:

    Vin is around 24V, but when turning on any heater it goes to 0 immediately.

    if your vin goes to 0v when turing on the heaters you have a short in your heater or heater wiring (the error from the stepper driver is likely a red herring)



  • @bearer I checked the wiring of the heater I get a full circuit, so I don't think it shorts



  • then your description of the problem must be wrong or lacking.

    incidentally if Vin goes to 0V the duet would reset, or are you running with an external 5v source?


  • administrators

    It sounds to me that either your PSU can't supply the heater current, or there is a bad connection between the PSU and the Duet. It's also possible but less likely that there is a bad joint on the Duet, either between the VIN terminal block and the PCB, or between the 7.5A fuse holder (assuming it is a Duet 2) and the PCB.


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