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Thread: Circuit Board on Trane XR80 has burned and kicked out 5amp Fuse

  1. #1
    Join Date
    Jun 2017
    Posts
    1

    Default Circuit Board on Trane XR80 has burned and kicked out 5amp Fuse

    I have a Trane XR80 Furnace/AC unit. The AC stopped working 2 days ago. I noticed that the 5amp fuse on the circuit board was burnt. I put a new fuse in it and pushed the door button to put power to the unit. I immediately noticed the circuit board is smoking. I can easily buy a new board and put it in. My concern is the new one will do the same thing if there is an underlying problem. The board is burning just right of the fuse (board installed upside down) at the C3 circuit around the W118 and W119 circuits. What is this C3 circuit that is burning? Do I need to look at something else before replacing the board? You should be able to see in the picture, if it uploads ok.

    For some reason the picture was rotated on upload. The burnt spot is north of the fuse (removed) in this picture.

    Circuit Board on Trane XR80 has burned and kicked out 5amp Fuse-img_0687-jpg
    Attached Thumbnails Attached Thumbnails Circuit Board on Trane XR80 has burned and kicked out 5amp Fuse-img_0684-jpg  
    Last edited by bpbrun; 06-17-2017 at 11:23 AM.

  2. #2
    Join Date
    Feb 2012
    Location
    Lala land, OH
    Posts
    219

    Default

    C3 is a capacitor. It is a energy storage device. They tend to explode (or smoke) when they fail...sometimes fun. Could be a "normal" failure. I doubt anything outside of the board would cause it to fail, unless someone was messing with something else.

    Make sure nothing fell onto or behind the board that could be causing a short. Also make sure that fuse is the correct size, NEVER go larger.

    I would check all your low voltage wiring to your t stat and to the AC condenser unit just to be safe. Time for a new board. If you have doubts that the board will fix it, call in a professional and let them diagnose it. Leave everything as it is now and tell them everything you know that happened and what you have done. They charge by the hour, the less work they have to do the less your bill goes up.

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