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Thread: OC error code on Ademco Vista 20A

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    Default OC error code on Ademco Vista 20A



    Hi all,

    We have recently moved into a house with an Ademco Vista 20 alarm panel.

    One of the children unplugged the power supply and the battery has completely drained.

    When the power is switched back on, I get the code OC showing in the keypad display.

    The unit was installed in 1998 so getting on a bit, and wondered if the old battery could be causing this problem?

    Otherwise, any suggestions on how I can get this unit back up and running again?

    Many thanks
    Neil



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    Senior Member watchdog's Avatar
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    Cool

    "OC" refers to loss of comunication between the panel & the codepad. I can't see that a flat battery will have anything to do with it.
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    Default

    A drained battery will not cause this.

    oc = open circuit = keypad is not receiving data from the panel.
    check the wiring on both ends (yellow and green are data).

    what keypad have you got? itll be a 6128 (fixed english) or a 6139 (alpha numeric) most likely. If its the 6139 just as a precaution make sure the address is set to 31. but this shouldnt cause an oc error.

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    Default

    Cheers guys.

    I'm not a techie so don't know what you mean by set address to 31?

    anyway, I disconnected the power, disconnected the battery and left it for a minute.

    I then reconnected and the alarm sounded for a couple of seconds, but now the OC error has gone which is good.

    Thanks a lot.
    Neil


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