Page 2 of 2 FirstFirst 12
Results 14 to 23 of 23
  1. #14
    Join Date
    Apr 2008
    Location
    il
    Posts
    19

    not a diyer

    im no diyer, just ran that call today and the problem was in the contactor. 1 year old unit. now i will figure out how to apply for pro.

  2. #15
    Join Date
    Feb 2006
    Location
    Tn.
    Posts
    1,344
    What kind of problem in the contactor?
    How'd u find it?
    Last edited by m-cooling; 09-16-2008 at 06:45 PM.

  3. #16
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,722
    Get your post count to 15, and apply.

    Much better answers when you ask questions in the pro tech forum.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  4. #17
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Quote Originally Posted by ECIndHVAC View Post
    What you say is very likely true.

    But look where the OP said that the 5 amp fuse was not blown. A short on the contactors sufficient to cause an evidently rapid transformer pop out would have surely put more than 5 amps in the low circuit.

    That leads me to suspect that he has a "minor" short, causing under 5 amps of current, and that it was just a coincidence that the tranny popped shortly (no pun intended) after he turned on the AC.
    Would have to say that would depend on how the loads are distributed on the board.

    Consolidated furnaces had no fuse on control board. They would sacrifice the xfmr in case of a short. Makes sense since an xfmr is the least costly part on a furnace.

    Had one go on me late last winter so i replaced it and added a mini breaker.

  5. #18
    Join Date
    Dec 2007
    Location
    East central Indiana
    Posts
    477
    Quote Originally Posted by hvaclover View Post
    Consolidated furnaces had no fuse on control board. They would sacrifice the xfmr in case of a short. Makes sense since an xfmr is the least costly part
    BTW, you have mentioned Consolidated & Texas Furnace a few times. Do you use these furnaces?

    If so, have you noticed that the Honeywell board on these things is prone to burn up at the blower relay? And have you found out what causes this, or how to prevent it? It seems like it's always the solder joint in one particular location. I've resoldered them before, and they work at the shop, but I'm kinda afraid to put them back on in residences.

    The 80% furnaces have moved away from this board, but the 90%ers still use them.

  6. #19
    Join Date
    Sep 2008
    Location
    Florida
    Posts
    34
    Contactor sounds like likely suspect but I would still check the low voltage wiring. Could have a nick on the insulation.

  7. #20
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Quote Originally Posted by ECIndHVAC View Post
    BTW, you have mentioned Consolidated & Texas Furnace a few times. Do you use these furnaces?

    If so, have you noticed that the Honeywell board on these things is prone to burn up at the blower relay? And have you found out what causes this, or how to prevent it? It seems like it's always the solder joint in one particular location. I've resoldered them before, and they work at the shop, but I'm kinda afraid to put them back on in residences.

    The 80% furnaces have moved away from this board, but the 90%ers still use them.
    Used to be one of the highest volume dealers in Mi for them in the 90s.

    Can't say as I have ever tried to repair a board. WaYYYY too much risk on liability.

    I sling Nordyne now but volume ain't so good. Bad times in Mi sorry to say.

  8. #21
    Join Date
    Dec 2007
    Location
    East central Indiana
    Posts
    477
    Quote Originally Posted by hvaclover View Post
    Used to be one of the highest volume dealers in Mi for them in the 90s.
    Ever deal with Bill Holman? or Francis Frank?

  9. #22
    Join Date
    Jul 2006
    Location
    NW burbs of Detroit
    Posts
    6,058
    Quote Originally Posted by ECIndHVAC View Post
    Ever deal with Bill Holman? or Francis Frank?
    Never heard the names. sorry. used to buy my furnaces from UEP.

  10. #23
    Join Date
    Apr 2007
    Location
    Saint Augustine, Florida, United States
    Posts
    1,149
    Had same thing. Bad reversing valve coil. New short ones don't fit the old units. Get on from the scrap pile or have fun replacing the whole valve.

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event