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  1. #1
    Join Date
    Sep 2011
    Posts
    58

    Sparks coming from air handler

    18000 btu upflow closet unit w/electric heater,
    call for cooling had just kicked in when sparks came out of the air handler, it lasted approximately 1 minute.
    turned breaker off and checked inside wiring, everything looked dry and in good shape, tight.
    checked breaker box and found no abnormalities..

    any ideas?

  2. #2
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,849
    My guess would be you had some heat strips burn into or break and fell against the chassis.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

  3. #3
    Join Date
    Sep 2011
    Posts
    58
    Name:  air handler.jpeg
Views: 96
Size:  32.4 KBName:  wiring.jpeg
Views: 98
Size:  38.5 KB
    Something I missed, there was some steam coming from a closeby shower room at the time this happened.

  4. #4
    Join Date
    Aug 2012
    Posts
    2,594
    You mean you watched sparks fly for a minute??? yikes.

  5. #5
    Join Date
    Sep 2011
    Posts
    58
    yah, well I didn't see the sparks myself, the first picture above shows the corner of the air handler, if you look closely you can see the burnt screw below the tape... Further testament of the presence of the sparks is when I turned breaker off and felt the warmth just on that one part of the handler, felt like 85 degrees.

  6. #6
    Join Date
    Aug 2012
    Posts
    2,594
    You have to find the short which is somewhere in the unit.

  7. #7
    Join Date
    Dec 2002
    Location
    Houston,Tx.
    Posts
    15,849
    Quote Originally Posted by myhvacx View Post
    if you look closely you can see the burnt screw below the tape...
    Looks to me like "from what I can see in that small picture" the plastic terminal block may have got hot due to loose connection, and did a semi meltdown, and the hot wires may have touched the chassis on the back side of the terminal block.
    __________________________________________________ _______________________
    “Experience is a hard teacher because she gives the test first, the lesson afterwards". - Vernon Law

    "Never let success go to your head, and never let failure go to your heart". - Unknown

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