Beko DE3431FW sump sensor probe

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  • February 11, 2009 at 11:18 am #43380
    johnstun
    Participant

    Can someone please elaborate on what this does exactly for me please?

    February 11, 2009 at 5:07 pm #277029
    Washman
    Participant

    Re: Beko DE3431FW sump sensor probe

    Hi

    It senses the water temperature, so controler knows when to switch heater off.

    Washman

    February 11, 2009 at 8:21 pm #277030
    Penguin45
    Participant

    Re: Beko DE3431FW sump sensor probe

    NTC thermistor – the hotter it gets, the lower the resistance. This is used by the pcb to interpret temperature. Readings are typically in kOhms.

    Penguin45.

    February 11, 2009 at 10:30 pm #277031
    johnstun
    Participant

    Interesting, thanks for the replies.

    So The problem I have is that my dishwasher has stopped heating the water period.

    Initially I suspected the pass-thru element, but this has tested as OK.

    But what you are saying is this will only act to stop the heating once a given temperature has been reached?

    So, if I’m understanding correctly, this will not be the cause of my problem.

    Perhaps it’s the POT that needs to be replaced then….

    …or perhaps I should just visit the skip followed by an electrical store!

    February 16, 2009 at 10:44 pm #277032
    cockney steve
    Participant

    Re: Beko DE3431FW sump sensor probe

    Initially I suspected the pass-thru element, but this has tested as OK.

    But what you are saying is this will only act to stop the heating once a given temperature has been reached?

    So, if I’m understanding correctly, this will not be the cause of my problem.

    Perhaps it’s the POT that needs to be replaced then….

    bear in mind that i’m NOT an appliance engineer

    Let’s start again 🙂 the sump-sensor should have a high resistance when it’s cold….so when the machine fills with cold water, the NTC (google it, if you don’t understand!) will “tell” the board to turn the heater on, but the board, in turn, needs to know there’s water there, etc.

    IF the heater warms the water, the NTC will drop in resistance, to the point the board “knows” the water’s hot enough.


    NTC out of spec. = wrong info to the board.

    heater low resistance to earth = spurious info to board

    board fault= heater and NTC will not get correct communication.

    sorry, I don’t know what the POT is , which you refer to. hope this is of some help, anyway.

    I’d check the NTC with an ohm meter and some hot water and plot temp/res graph (roughly) I’d also check heater isn’t leaking to earth.-for starters.

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