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  1. #1
    Join Date
    Nov 2012
    Location
    Minnesota
    Posts
    77
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    Carrier 19XRV "high line voltage" alarm. ISM bad?

    Trouble shooting a customers 19XRV. Prestart failure on High line voltage. Panel shows 200-1000v jumps around. Incoming is rock steady at 480v.
    Trouble shot panel with power off, now alarms with reverse phase?
    Power and phasing is normal, anyone seen this? I'm guessing the ISM board. But that is a $2100 guess, Any help is appreciated

    Greg

  2. #2
    Join Date
    Jan 2008
    Location
    East of big city prices.
    Posts
    3,758
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    Me thinks you need to remove your pricing per the rules.

  3. #3
    Join Date
    Nov 2012
    Location
    Minnesota
    Posts
    77
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    I don't see how to edit? Oops.

  4. #4
    Join Date
    Aug 2002
    Location
    Greenville SC
    Posts
    442
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    Most likely the ISM

  5. #5
    Join Date
    Nov 2010
    Posts
    1
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    Im sure you already fixed this but i have replaced 2 isms for the same reason in the past 5 years on the same 19xrv. Just thought id post for others

  6. #6
    Join Date
    May 2012
    Location
    California
    Posts
    287
    Post Likes
    Most likley ISM

  7. #7
    Join Date
    Aug 2007
    Location
    Southern NJ
    Posts
    32
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    You could even have something as simple as a loose connection on the communication wiring connecting all the control boards, or corrosion on a pin connecting a sensor to a board. In my experience I have noticed Carrier chillers to be very prone to nuisance faults that do not actually exist. I would check every connection on every board before replacing components. I wish you luck.

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