Zanussi FLA1001W not heating

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  • July 31, 2009 at 2:17 pm #47480
    iadom
    Moderator

    PNC. 914780589-00

    Customer says it is completing wash quicker than normal and is not heating.

    Element is OK, wiring to timer seems fine. Do these machines advance out of the heating cycle after a period of ‘no temp increase’ ?

    I suspect the timer, unless you know different. 🙂

    Jim.

    July 31, 2009 at 2:42 pm #293614
    Phidom
    Participant

    Re: Zanussi FLA1001W not heating

    What is the NTC resistance? I’ve had a few NTCs go low resistance on these lately so the electronics thinks they are already up to temperature.

    July 31, 2009 at 9:02 pm #293615
    iadom
    Moderator

    Re: Zanussi FLA1001W not heating

    NTC appeared OK, machine was hardwired 😥 so I couldn’t use my plug in meter but I observed the mains input meter in the cupboard under the stairs. It was the old style rotating disc type.

    The heater never even switched on which I’m sure it should have done, even with a faulty NTC it should have gone through a heat stage on this mechanical/hybrid timer before advancing to the next step.

    Jim.

    August 1, 2009 at 7:19 am #293616
    Phidom
    Participant

    Re: Zanussi FLA1001W not heating

    Why would it switch the heater on if the NTC was saying it was already up to temperature? Last one I did was a Bendix BIW103W. Old NTC was 1.5K at room temp. , replacement was 27K. Symptoms were the same, going through without sticking but not powering the heater.

    August 1, 2009 at 7:51 am #293617
    Martin
    Participant

    Re: Zanussi FLA1001W not heating

    Phidom wrote:Why would it switch the heater on if the NTC was saying it was already up to temperature?

    As Jim says it will still go through to the 2 minute heat step on the timer before the NTC allowed the holding solenoid to release it and advance to the next stage. 😉

    August 3, 2009 at 9:34 am #293618
    electrofix
    Moderator

    Re: Zanussi FLA1001W not heating

    nts readings should be on early hybrid timers

    30 degrees 17k
    40 11.5k
    50 7.8k
    60 5.5k

    i would put a straight resistor say 20k set to 50 degrees or higher and see if it heats

    on late pcb units nts starts at

    20 degrees 6k
    60 degres 1250 ohms

    also on some zanussi auto with pcb mounted in a box by rh suspension spring the timer is programmed to skip heat if no rise in temp is found within a set time. no fault code will appear. had one of the ended up new pcb now ok

    hope this helps

    Dave

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