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  1. #1
    Join Date
    Jul 2009
    Location
    Michigan
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    Carrier RCB Boards

    Has anyone ever had a failure of a RCB Board on multiple different Z Series Units? The reoccurring failure point I have witnessed is near the J4 connector where the discrete inputs are landed. The board usually will have a little burnt mark like when a small circuit board resistor burns.

  2. #2
    Join Date
    Jan 2008
    Location
    Dallas ,Texas
    Posts
    3,746
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    The only thing I have seen where the ABB VFD was basically eating the 4-20ma signal from the board and it was pretty much toast . Not sure if its related to the fried resistors you are referring to.

  3. #3
    Join Date
    Jul 2009
    Location
    Michigan
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    I do have ABB Drives. The burnt mark is near the remote occupancy and enthalpy terminals. I also have lost the VFD Signal only in the past. Interesting.

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