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  1. #14
    Join Date
    Mar 2004
    Location
    Chester County PA
    Posts
    375
    On another note, what company is turning away a service call? At least send some out to check out the system and gain a customer.

    ~smoke~
    "That motor's done, he let the factory smoke charge out!"

  2. #15
    Join Date
    Jan 2013
    Posts
    19
    They turn lots away if it is more than a 15 minute fix or if they cant sell them a new unit. I know why its not defrosting, The question is why is the top freezing and the bottom not?

  3. #16
    Join Date
    Sep 2005
    Location
    Atlanta GA area
    Posts
    21,057
    Good to hear Trane is Demand... we do not have many HP's around my area.

    Usually the outdoor coil is split into 4-5-6 parallel sections... big manifolds on the side. Should be similar temps all up and down.

    Let us know what you find! THX
    GA-HVAC-Tech

    Quality work at a fair price with excellent customer service!

    Romans Ch's 5-6-7-8

    2 Chronicles 7:14

  4. #17
    Join Date
    Aug 2012
    Location
    Palmyra, Missouri, United States
    Posts
    224
    my guess is that the house has no gutters and the melting ice is dripping right on the center of the heat pump.

  5. #18
    Join Date
    May 2006
    Location
    Austin, Texas
    Posts
    279
    The rain freezes on the top and not the coils. It has no way of defrosting the ice and it just collects until it interferes with fan blade.

  6. #19
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,627
    hope he already turned it to emergency heat
    We really need change now

  7. #20
    Join Date
    May 2009
    Location
    Savannah, Ga/H.H. Island, S.C.
    Posts
    1,455
    This issue could be caused by several things. Trane/AS use demand defrost. It has two sensors. A condenser coil sensor and an ambient temp sensor. It is constantly sensing the delta t between these two sensors. Once the calculated delta t is met, a defrost cycle is intiated.

    Check the sensors. The coil sensor is located on the bottom of the coil, move it to the top and see if that remedies the issue. All sensors can be ohmed. Check the service manual for temp - resistance chart.

    This is an open forum. We try not to get too technical here. Get your post count up and apply for a pro membership, then you can see what this site really has to offer.

  8. #21
    Join Date
    Mar 2004
    Location
    Chester County PA
    Posts
    375
    Rain or undercharge.
    If there are noncondensibles you will see an un-even frosting pattern across the whole coil.

    ~smoke~
    "That motor's done, he let the factory smoke charge out!"

  9. #22
    Join Date
    Jan 2013
    Posts
    19
    The OAT has not been below 34 & theres been no ice or anything on the house. The unit is on the eve end of the house so forget about water running off the house into it..& r glasgow, the top few rows of the coil are froze really big, not water freezing all across the top of the unit?

  10. #23
    Join Date
    Jan 2013
    Posts
    19
    & if it were non CONDENSEables would that not be in the top of the condenser?? Not causing problems in the evaporator right?

  11. #24
    Join Date
    Jan 2013
    Posts
    19
    Thanks for the input Brent..i'm trying to get my post count up! This is good info but still doesnt explain why it's freezing only at the top..

  12. #25
    Join Date
    May 2009
    Location
    Savannah, Ga/H.H. Island, S.C.
    Posts
    1,455
    Jmack,

    We can't diagnose the problem for you.

    We can only offer "suggestions." It is very difficult to pinpoint a service issue such as this one from a keyboard.

    You're a technician. Use yours skills, along with info provided and determine the issue. Let us know what you find!

  13. #26
    Join Date
    May 2006
    Location
    Austin, Texas
    Posts
    279
    Jmack, not sure of that particular coil but refrigerant does not generally enter from one end and exit the opposite end be it top or bottom. The coil has several different circuits. After completely defrosting, run in heat mode with no outdoor fan and observe for frosting pattern. May point you in the right direction.

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