Hotpoint FDW80 dishwasher playing dead

[charliefixit]

Hi all, My Hotpoint FDW80 fails to power on properly. After turning on at the mains it will do the initial beep (as normal) but the LCD display stays blank and not lit.

Visual inspection of the control module and the display module shows no obvious problems or damage. I have re-seated the connectors several times but the display stubbornly refuses to come on.

What I’m trying to do is diagnose if it needs a new module (and if so, which one), or if it’s more likely a loose or broken connection somewhere that needs tracing.

I removed the 4-wire comms cable that goes between control module and display module. With the cable removed the display does light up 15 seconds after power on, showing code AL-99. Does this suggest the display module itself is OK?

The control module has 4 LEDs on the reverse side, one of these (2nd in from PCB edge) does a slow on/off flash. Other 3 LEDs are all unlit. I have a feeling this normal behaviour, is that correct or does it show an error code?

Btw, in case anyone is concerned, I’m well aware there are high voltages inside and I have the necessary competence to work safely.

[Martin]

Re: Hotpoint FDW80 dishwasher playing dead

charliefixit wrote:Does this suggest the display module itself is OK?

I would think the opposite applies. The power module clearly recognises that the display module was disconnected so that would rule out the power module.

To quote Paddy McGuinness “….no likey? no lighty!” 😉

[iadom]

Re: Hotpoint FDW80 dishwasher playing dead

AL-99 suggests you have removed the connection between pcb’s and nothing else. AL99 is a communications error.

2nd light flashing on the basic, non display models is a fill fault, 3rd light is NTC open circuit, depends which edge of the pcb I suppose. Neither of those faults would render the display inoperative. The electronics on Indesit appliances are known to be very flaky, full model, serial number and commercial code needed to ID any parts.

[charliefixit]

Re: Hotpoint FDW80 dishwasher playing dead

iadom wrote:AL-99 suggests you have removed the connection between pcb’s and nothing else. AL99 is a communications error.

Yes that’s exactly what I did. With the cable connected the display appears dead. With the cable disconnected it shows AL99 15 seconds after power on.

Martin wrote:

charliefixit wrote:
Does this suggest the display module itself is OK?

I would think the opposite applies. The power module clearly recognises that the display module was disconnected so that would rule out the power module.

Sorry, I don’t quite follow that reasoning. By power module do you mean what I’m calling the control module? I.e. the one that does the power switching for solenoids, pump etc. Surely if it’s disconnected then the display module is deciding for itself to put up AL99, which provides some confidence that the display module is not completely fupped. I note though that the display ‘module’ has 2 PCBs – the LCD PCB and what appears to be a PSU PCB, is that what you mean?

iadom wrote:2nd light flashing on the basic, non display models is a fill fault, 3rd light is NTC open circuit, depends which edge of the pcb I suppose. Neither of those faults would render the display inoperative. The electronics on Indesit appliances are known to be very flaky, full model, serial number and commercial code needed to ID any parts.

Thaks for the info. I’ll try and post photos to avoid any confusion about the LEDs, PCBs, etc.

I’ll check the NTC for O/C. Would it be worth tracing all the cables for faults? at this point I only have the door panel open. The 4-wire comms cable is checked OK from PCB to PCB.

Model: FDW80P
Type: LS12-EVO3
S/N: 50712

[iadom]

Re: Hotpoint FDW80 dishwasher playing dead

Really need full, correct serial number and commercial code, serial number is a 9 digit number, comm code is an 11 digit number, however……..

This machine has two totally different sets of electronics, the early one has the display and control pcb in the facia panel, the later one has the main pcb in the base.

Unless one of the company engineers knows what the four lights on the pcb are for you are struggling, we do not have any information on those.

If that number is the first five digits of the serial number then the control pcb is a C00143200, around £80.00.
The display pcb is a C00143234, list price £100.

[charliefixit]

Re: Hotpoint FDW80 dishwasher playing dead

iadom wrote:Really need full, correct serial number and commercial code, serial number is a 9 digit number, comm code is an 11 digit number

37331870000 S/N 50712 1681

iadom wrote:This machine has two totally different sets of electronics, the early one has the display and control pcb in the facia panel, the later one has the main pcb in the base.

From that description mine is clearly the earlier variant.

[Martin]

Re: Hotpoint FDW80 dishwasher playing dead

Yes of course. I’m suggesting that the display board is the problem.

[iadom]

Re: Hotpoint FDW80 dishwasher playing dead

Yours has two different control and facia pcb’s the numbers I gave above are correct.

[charliefixit]

Re: Hotpoint FDW80 dishwasher playing dead

Thanks for the replies. Ouch at those prices, esp. without knowing for sure it’ll fix the problem.

Google didn’t give me any useful hits on C00143200. I found an identical looking control module on Ebay but the bar code says ‘-E1-‘, not ‘-F4-‘ like mine below. Is that likely to work? Could be later rev. of the same board or incompatible?

Here are the modules. The LED toggles on/off at about once per second.

[iadom]

Re: Hotpoint FDW80 dishwasher playing dead

Sorry, my mistake, it should be C00143220. :clown:
That board is not compatible.

if that picture is looking at it from the front as if it was in situ then it is ‘supposed’ to be a fill fault, possible causes are.
Inlet valve, heater Earth fault, open circuit heater.

None of those would cause a display fault.

[Author]

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