WT540

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  • July 1, 2011 at 6:47 pm #63705
    Johnokent
    Participant

    Hi guys, looking through search facility this seems to be an old chestnut.

    Have this machine flashing lights 3&4 indicating fo3, Ntc fault.
    As in previous topics. machine fills for a few seconds, then pumps and fills at same time. Only way to stop it is to kill power at supply.
    Changed thermister for new but no difference. Others have suggested board failed but can’t find any feedback if anyone changed board and cured problem.

    Any advice greatly appreciated

    Thanks John

    July 1, 2011 at 10:44 pm #354590
    leavemetogetonwithit
    Participant

    Re: WT540

    Johnokent wrote: Only way to stop it is to kill power at supply.

    That is certainly a big arrow pointing at board. EMW?
    Mike.

    July 2, 2011 at 9:47 am #354591
    Johnokent
    Participant

    Re: WT540

    Thanks mike, not what I wanted to hear, but obviously suspected.

    John

    July 2, 2011 at 11:21 am #354592
    leavemetogetonwithit
    Participant

    Re: WT540

    Could be a capacitor on board. Have you read, “Simple pcb repairs” sticky?
    Mike.

    July 2, 2011 at 2:21 pm #354593
    Johnokent
    Participant

    Re: WT540

    Thanks for pointing me in that direction. If I see obvious damage I will try repairing myself. I have to go back to job to check what version the PCB is before I go to EMW. So I’ll have a good look at it.

    Looking at previous postings and at EMW site , random fault indications seems to be quite common with this machine.

    John.

    July 4, 2011 at 8:25 am #354594
    leavemetogetonwithit
    Participant

    Re: WT540

    Incidentally, have you checked continuity of loom from board to thermistor? IIRC, ntc would be approx 25Kohm @ 20*C.
    Mike.

    July 4, 2011 at 9:49 am #354595
    Johnokent
    Participant

    Re: WT540

    Hi mike, yes, checked loom continuity this was ok, as you say, it was about 25k at room temp.

    Thanks

    John

    July 7, 2011 at 8:20 pm #354596
    Johnokent
    Participant

    Re: WT540

    Hi all, just a follow up on this, got a refurb board from EMW solved problem.
    Apparently, irrelevant fault codes are not uncommon on these. Its worth checking the connectors on these boards as well, as they can work loose enough to give error codes.

    John.

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