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  1. #1
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    667

    start cap blew up

    carrier infinity system thermostat said communication error lol i said oh man i hope its something obvious, im not familiar with these fancy t-stats.
    i jumped when i opened the condenser's electrical compartment because all the paper from the start cap dropped out. the start cap shot down and knocked off a male terminal comming off the circuit board. all the wires were burnt together.
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  2. #2
    Join Date
    Nov 2006
    Location
    Southeastern Pa
    Posts
    19,297
    Okay.

    Do you have any guesses as to what would make a start cap blow apart.....?
    [Avatar photo from a Florida training accident. Everyone walked away.]
    2 Tim 3:16-17

    RSES CMS, HVAC Electrical Specialist

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  3. #3
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Quote Originally Posted by timebuilder View Post
    Okay.

    Do you have any guesses as to what would make a start cap blow apart.....?
    Usually a fried potential relay, but a stuck compressor, cycling on its overload, can cause it too, among other things.
    If more government is the answer, then it's a really stupid question.

  4. #4
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,443
    Possibly a cap that the internal overload didn't activate properly?

  5. #5
    Join Date
    Feb 2006
    Location
    USA
    Posts
    4,381
    Looks like that stayed in the circuit a little long. Wish I could find one like this. Only have found them partially melted leaking fluid

    Sent from my SCH-I800 using Tapatalk 2

  6. #6
    Join Date
    May 2009
    Location
    Cummins, GA
    Posts
    1,550
    Quote Originally Posted by hvac wiz 79 View Post
    Looks like that stayed in the circuit a little long. Wish I could find one like this. Only have found them partially melted leaking fluid

    Sent from my SCH-I800 using Tapatalk 2
    Haha. I don't wish to find one like this. That looks like a terrible mess to clean up.

    But, I would like to troubleshoot the reason for such a catastrophic failure

  7. #7
    Join Date
    Nov 2009
    Location
    Tennessee
    Posts
    76
    Quote Originally Posted by timebuilder View Post
    Okay.

    Do you have any guesses as to what would make a start cap blow apart.....?
    Back when I did refrigeration I had a condenser that was flooded from a rain storm that blew both run and start caps. The ribbon from the start cap was still hot when I came up on it. I remembered that for a long time. Not the kind of learning experience a person wants.

  8. #8
    Join Date
    Apr 2010
    Location
    East of Lyndon's
    Posts
    525
    Most likely your start relay is bad or the wire came off terminal #5. Usually if the cap blows up it's because the relay didn't open.
    If you can't fix it with a hammer, you've got an electrical problem.

  9. #9
    Join Date
    Sep 2010
    Location
    miami,fl.
    Posts
    667
    Quote Originally Posted by timebuilder View Post
    Okay.

    Do you have any guesses as to what would make a start cap blow apart.....?
    well a couple of reasons that i know are if the compressor is short cycling could be due to a few issues low pressure, hi pressure or any issue that causes the compressor to short cycle. also if the start cap is staying in the circuit too long due to bad start relay, or if the start cap doesnt have a bleed resistor. but if ive missed anything let me know. i always have my eyes and ears open for more knowledge

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