Question about Amana Heating & Cooling

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Have an amana central air duelfuel heat system.when aux heat[gas] heats the house and shuts off the fans still blow for 3 to 5 minutes with the last couple of minutes being cold air which cools the air it just heated. also heatpump will start heating when it comes on then after 3 or 4 minutes it starts blowing cold air like when the air conditioner is running.i have had problems from day of install 4 mounths ago with problems that keep coming up. please i need help fast i do not think company that istalled has a clue.by the way it came with a 10 year parts and labor warranty but if can't fix the unit what good is that.

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  • Danny Clark
    Danny Clark May 11, 2010

    This would take a true, on site diagnostic to be sure.



    But it sounds like you may have a bad defrost control board.



    Here's how it works.



    Heat pump is in operation, the indoor coil gets hot, the outdoor coil gets very cold. It routinely needs to defrost.

    When it goes into defrost mode, the refrigerant reverses flow causing the indoor coil to get cold and the outdoor coil to get hot, thereby defrosting the outdoor coil. Basically, to defrost, it is going into AC mode.

    During that time, the defrost board is supposed to bring on the secondary heat source, in your case, the furnace. This keeps hot air coming out instead of cold during that defrost cycle.



    You need to get an accurate temperature reading device and determine what temperature the air coming out of the vents is when you say it is cold.



    If it is room temperature, during the few moment right before shut down, that is normal. Your hand is roughly 94 degrees so anything cooler than that will feel cool.

    If your indoor air is 70 degrees, when the fan is circulating air only, it will be blowing 70 degree air. That will feel cool to the hand.



    If you discover the air coming out of the vent is 10 to 20 degrees colder than the air going into the return, then yes, the system is in cooling mode, or defrost, and you probably have a bad board.



    It is normal for the blower to continue to blow for a short time after the furnace shuts off, as it has to cool off the heat exchanger to prevent premature failure. (cracks)



    If you are used to a gas or electric furnace, you are probably used to 100 to 160 degree air coming out if the vents. That will of course feel very warm.



    When a heat pump is in heat mode, the temperature can range from 80 to 120 degrees depending on how cold it is in the home.

    (40 degree indoor air, 80 degrees from the vents is normal. 80 degree indoor air, 120 is normal)



    If the heat pump is producing 95 degree air at the vent, and your hand is 94/95 degrees, (Core body temp 98.6) then it will not feel worm to the hand, but 90 degree air will certainly warm the home.



    Thus the need for a good fast reading thermometer.

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Change your heating delay to shut off sooner, you can find this in the installation manual. Also the Thermostat may have delay after heat as well. It is true there could be many variables, but it also sounds like the Heatpump is not charged properly, you will have to have a different tech come out and check that. No need to have the installer mess your system up any further. This solution will only correct the auxilary heat, your heat pump on the other hand will require expert skills.

Posted on Dec 05, 2008

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