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Heat pump blows heat half the time and cold half the time

The heat pump heat works normal....until....it will kick on and blow cold air sometimes. This causes a quick temp drop in my 450 SF bonus room area (71 degrees down to 68 in only 2 minutes for example).
I turn it off and sometimes when i turn it on again it works normal and sometimes it doesn't....
Amana heat pump http://www.dnmech.com/lit/20209826.pdf

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  • ronmantwist Dec 03, 2008

    Hmmm, i think you may be right....although i haven't noticed the outside unit frosting up....But, something i didn't mention before (in my hopes that it didn't have anything to do with problem) is that this past summer the fan on the outside unit died so i had to replace it. i was in a hurry because it was very hot (95 to 100 F outside and inside - bonus room) and i have someone living up there.

    The new fan i used didn't have as many wires as the old fan so i had to just connect it directly to the power source near the bottom....not using the other connections that were used by the old fan located on the little computer board near the top. This worked great....for the cooling in the summer.

    I think perhaps i bypassed some anti-defrost connections on the outside unit board, and this might be the problem....?

    Here's a pic of the connections before i made the change.

    thanks!

  • ronmantwist Dec 04, 2008

    Its not the right motor, but the closest i could find on short notice....do you know a website/store that i could order the correct one from?

    I'll also check the wiring diagram.......

    thanks for the response!

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It sounds like it is just going into the defrost cycle. Go outside and see if it is iced up. If it is, it reverses itself to melt the ice. Heat strips should come on if unit has them

Posted on Dec 03, 2008

  • Walter Whitaker
    Walter Whitaker Dec 03, 2008

    Sounds like you hit it on the head. No power going to the fan from wires from board to motor that was there before. There may be a way to jump it, but I would ask a serviceman to see, or get the right motor for it. If it is the replacement motor for the unit, there has to be some way to jump it for it to work. Check the diagram on back of the door, and you may get some help from it.

  • Walter Whitaker
    Walter Whitaker Dec 04, 2008

    Check www.grainger .com They will come closer than anyone else, and they will ship it to you. Their prices are a lot cheaper than a dealer. If you have the old one, get the model number, and you can search to see if they have it.

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