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  • bradh

    Member
    November 4, 2020 at 11:06 pm

    Hobart dishwashers are also susceptible to failure in the door switches/sensor causing the relay board to turn itself off, thus dropping the power out of the main display. What do you do to get the unit to turn back on? Do you unplug it, plug it back in and reboot it, just turn it back on at the right hand side i/O button or does it come back on by itself?

    When you open the door, does the display go out as well? This might help you mimic the fault you are getting.

  • bradh

    Member
    November 4, 2020 at 11:09 pm

    One other thing you need to think about is the ribbon cable that connects to the display board from the main PCB. There may be a fault with that cable or connection that is causing the washer display to come on and off like it is.

  • coffeegeek

    Member
    November 5, 2020 at 6:38 am

    I must manually turn it on with the right hand side i/O button. I doubt it’s the display cable, as it’s completely turned off (i hear the relays clicking when I turn it on again). Opening/closing the door doesn’t do anything (as far as I’ve seen, though I haven’t looked for any behaviour when using the door).

    Could a failing contactor be the problem? The machine only turns off now and then, I’m not sure if a contactor would just fail now and then, or completely break down…. I just want to ask before replacing it.

  • bradh

    Member
    November 5, 2020 at 7:54 pm

    How many staff use the machine? Does a right handed person use it? Does the door have a indented latch point which possibly they are using their thumb on the control panel to leverage the door open. Maybe the thumb bumps the I/O button, haha.

    Is there steam leakage coming up into the panel causing a failure of the board or a circuitry short. There maybe a small capacitor on the PCB that has received some steam damage and is not holding charge causing it to drop out.

  • coffeegeek

    Member
    November 6, 2020 at 5:47 am

    I’m pretty sure it’s not user error, since it happened while I was working on it. I turned my back to the machine to read the parts diagram. Then after a few minutes, it was turned off.

    It seems to have some steam leakage coming out from the top part of the door, but I’m not sure how much is “normal” for these machines. PCB seems to be without corrotion/water/steam damage (i’m electrical engineer so I can usually spot this quickly). Of course the electrolytic capacitor might be damaged, I could try to replace it.

  • fixbear

    Member
    November 6, 2020 at 9:19 am

    It sounds more and more like a loose or corroded electrical connection. Sensor, comm, or hold in contacts of a relay. The worse kind to find with any certainty.. The kind that keeps you awake at night. Good luck.

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