Question about Hobart 29 in. AM15-1 Free-Standing Dishwasher

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Power supply (transformer)

We dont seem to have enough voltage on the power supply input? what is the secondary voltage is suppose to be?

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  • Robert Lanteigne May 25, 2008

    none of the module (timer, etc ) seem to work, i the primary voltage is there but i have 6 volt on the transformer secondary (red lead pair ), the diagram say's that i should have between 13 nd 15 volts DC?

  • Robert Lanteigne May 26, 2008

    Thank you very much for the tip, i will do that, it is a failure type of problem... my assistant try to grounded all the device of the machine and it doesn't work since....

    i think it is an AM 14 or 15, the plate is in bad shape...

    the power supply has two secondary set of wire one blue and one red on the blue i have 110V and 6V on the red as mention on the previous what is suppose to be the AC voltage of the secondary transformer?



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You should have just one supply voltage on an AM type dishwasher. Find the data plate in one of these places - frame behind RH door, on the control box, under the front cover. The required voltage and phase (1 or 3) will be listed there.

What is the problem with the unit?

Posted on May 25, 2008

  • AbsoluteServ May 26, 2008

    What is the model of your DW? Is this an AM12? If so, remove the red leads and take your reading. On an AM12, a bad board can pull-down the voltage. Is this a "failure", or is this a troubled install?

  • AbsoluteServ May 26, 2008

    If the last thing done was working with the supply or chasis grounds, you need your helper to retrace his steps.

    Check that your transformer is grounded WITH THE PROPER connections. Do the same for any ground on the secondary side. Also, when testing a transformer, choose your test points accurately. Don't take a reading from the secondary output to ground, if ground is not part of the secondary control circuit.

    Ultimately, I think your voltage is being pulled down. So isolate and divide the circuit as you test it. In case you dropped a leg on your supply, also make SURE you have all three hots. (If 3 phase)

    As far as the actual voltage you should be seeing, I would need to at least know the model number. But if the schematic shows 15 volts, that sounds right for an older AM, like an AM12. I know that Hobart schematics are most always accurate. So if it says 15 volts, you can trust that is accurate.



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No control power

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SECONDARY means output( to load side)

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