Whirlpool ADG7540 Dishwasher Not Heating?

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  • August 7, 2007 at 8:16 am #29560
    laurenceuk
    Participant

    Hi,

    I am going to this appliance Wed. The complaint is not heating but it goes
    through the prog to the end.

    Is there a common complaint on this m/c re not heating.

    Does the heating cct include the `probe feeler` as described in Connect
    Pt number 5031682990711

    I seem to remember fitting one of these a long time ago but can`t remember
    the fault.

    Thanks

    Laurence

    August 7, 2007 at 8:23 am #223607
    gegsy
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    Hi
    Sometime you don’t get the continuous flashes for NTC fault, you may find it just won’t heat 😕 even though NTC/feeler may read ok 😯

    Greg

    August 7, 2007 at 10:26 am #223608
    laurenceuk
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    Hi Gegsy,

    Thanks for your response.

    That sounds exactly what is happening here.

    I asked the customer to put the m/c through a prog again and watch for
    lights flashing but it ended with no fault indications showing and it had
    not heated

    What is the normal NTC reading – if you have it.

    Thanks again

    Laurence

    August 7, 2007 at 4:08 pm #223609
    DentedPorsche
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    NTC can cause this on the rare occassion.
    Most times, it’s the pcb at fault. Either burnt or scrambled software.

    Brian

    August 7, 2007 at 6:30 pm #223610
    spanner51
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    I had exactly the same complaint on the same model. heater OK. NTC OK. Connections list 2 modules. One goes at the top behind the facia ( which is what I quoted for, but didn’t get the go ahead). The other one I wasn’t sure about.

    August 7, 2007 at 6:34 pm #223611
    gegsy
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    laurenceuk wrote:
    What is the normal NTC reading – if you have it.

    NTC
    20 °C 58.1 kOhms
    25 °C 47.1 kOhms
    30 °C 38.2 kOhms
    40 °C 25.4 kOhms
    50 °C 17.2 kOhms
    60 °C 11.8 kOhms
    70 °C 8.3 kOhms
    80 °C 6 kOhms
    85 °C 4 kOhms

    Greg

    August 7, 2007 at 9:06 pm #223612
    laurenceuk
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    Thanks all,

    Thats a great help – gives me the direction to look towards.

    Laurence

    August 8, 2007 at 12:43 pm #223613
    laurenceuk
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    From the table you kindly posted Gegsy I would hopefully feel confident
    that it is the NTC that is the culprit.

    The customers NTC reading is 4.6K ohms at ambient temp. From the
    table, the PCB is assuming that it is already at temperature hence the reason
    it completes the program normally without heating.

    Thanks again

    Laurence

    August 8, 2007 at 8:01 pm #223614
    gegsy
    Participant

    Re: Whirlpool ADG7540 Dishwasher Not Heating?

    Jobs a gudden then Lawrence 😉 😀

    Greg

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