Dishwasher cycle sequence intermittent fault.

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  • May 28, 2019 at 11:06 am #95921
    TWO
    Participant

    Smeg Dishwasher Type 12043 Model DW1612C
    This is stopping mid cycle and just hanging. (The exact point is not known, but could be about 10minutes into the cycle.) Only the selected programme led is lit, so it is not displaying any fault code.
    The programme can be cancelled and subsequent use may or may not produce a completed programme.
    Accessing its guts when it has hung does not reveal anything as a visible connection problem, but just “rebuilding” it makes it work next time.

    I can only conclude that either a sensor is not working or some activator is not functioning or some component is not responding.

    With it being frustratingly intermittent, how can I narrow down the possible culprit?

    Help would be welcomed, please.

    May 28, 2019 at 11:51 am #461735
    kwatt
    Keymaster

    Sounds like a heating error of some sort so, could be the stats or heater if correct.

    K.

    May 28, 2019 at 2:35 pm #461736
    TWO
    Participant

    Would those have an intermittent or self correcting situation as I thought they would be go or no go only.

    May 28, 2019 at 3:07 pm #461737
    kwatt
    Keymaster

    Ordinarily yes but, it’s weird in any event with no error code so it’s something odd.

    K.

    May 28, 2019 at 8:17 pm #461738
    electrofix
    Moderator

    this looks like an early Smeg board

    These board have a habit of developing a fault as the board power supply degrades over time

    the following is quite a normal run of events

    start programme, machine pumps out, pump stops and starts to fill. when full main pump runs. After a while the timer tries to turn on the heater. Its at this point the power supply is unable to supply enough power and the board crashes. Some times if you listen carefully a few beeps can be heard from the timer but very quiet. On some machine it will wait a minute and restart programme when power recovers

    Dave

    May 29, 2019 at 10:33 am #461739
    TWO
    Participant

    Thanks.
    A new replacement board would not be worthwhile.Is it likely to be repairable?
    Any idea which board component is failing?

    May 29, 2019 at 11:43 am #461740
    electrofix
    Moderator

    there is a large capacitor on the board either grey or blue. think its 1uF or 1.5uF 275v ac x2 type

    type epcos x2 capacitor into google

    Dave

    May 29, 2019 at 12:58 pm #461741
    TWO
    Participant

    Thanks for that “heads up.”
    Next time the fault occurs I will have the pcb out and look into swapping the capacitors.
    In the meantime, (I am not into electronics) where did you source your supplies as google is not returning any (retail) small quantity suppliers.

    May 29, 2019 at 6:57 pm #461742
    electrofix
    Moderator

    not sure if I got them from Farnell ot rs components

    https://cpc.farnell.com/epcos/b32924c3105m/capacitor-class-x2-1uf-305vac/dp/CA07125

    that is the 1uF but as I said cant remember if it 1.5uF so check before you order

    Dave

    May 29, 2019 at 9:39 pm #461743
    TWO
    Participant

    Many thanks.

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