Whirlpool ADG7540 Dishwasher Not Heating?

[laurenceuk]

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

[gegsy]

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

[laurenceuk]

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

[DentedPorsche]

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

[spanner51]

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.

[gegsy]

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

[laurenceuk]

Re: Whirlpool ADG7540 Dishwasher Not Heating?

Thanks all,

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

Laurence

[laurenceuk]

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

[gegsy]

Re: Whirlpool ADG7540 Dishwasher Not Heating?

Jobs a gudden then Lawrence 😉 😀

Greg

[Author]

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