Question about Goodman CKL36AR36 Air Conditioner

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The air handler won't shut off

When the set temperature is reached the outside condenser shuts off but the air handler keeps running (for hours). The only way I can turn it off is by throwing the circuit breaker. The problem started a few weeks ago. I replaced the batteries in the thermostat and everything was working fine. Now the problem is reoccurring.

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  • mama6 Jan 01, 2009

    We have the same problem. Do you know where we can find this little black box to replace it? Is this something I can get at Home Depot or Lowes?



    Thank you,

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  • 306 Answers

As long as the t-stat fan switch is in the auto position the problem sounds like fan relay is stuck. It looks like a little black box about 2 inches square. Has 5 positions on it two of them are for 24 volts.
Be sure you turn off power before pulling it out. Make note of the arrangement of the wires maybe label as you remove them. ken

Posted on Dec 27, 2008

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3 Answers

My Goodman heat pump doesn't blow air through the vents into the house, but the fan comes on when the thermostat is turn on for the air conditioning


Check first that
  • the air conditioning equipment is turned on,
  • the thermostat is calling for cooling, and that
  • the blower unit or air handler is actually blowing air through the ductwork.
Here are the details of what to check in what order if your air condtioner or heat pump doesn't start at all when you set the room thermostat to call for cooling:
  1. Check the Room Thermostat Temperature Setting: Set the thermostat to at least 5 degrees below room temperature. Our elderly mom has no patience with switches and controls. She regularly calls her air conditioning service company with a service request, sometimes late at night, because she has simply failed to set the temperature on the thermostat lower than the room temperature. Don't drive your A/C like our mother.
  2. Check that the Room Thermostat is set to "Cool" not "Off" or "Heat". If the thermostat is not set to "cool" it is simply turning off your A/C. If the thermostat display is blank then it's not receiving power (for modern digital thermostats). Check that electrical power is on at the air handler and to the the low-voltage transformer that supplies power to the thermostat.

    If the thermostat has power, check that when you set the thermostat temperature down at least 5 degrees below room temperature the thermostat calls for cooling. If it doesn't then check for broken or shorted thermostat wires anywhere between the wall thermostat and the control board at the air handler.

    You can easily eliminate possible thermostat problems as a cause of failure of the air conditioner to start by simply eliminating the thermostat from the picture: disconnect the thermostat wires at the blower unit's control board and instead connect the two thermostat terminals directly together with a jumper wire. If the system starts then the problem is in the thermostat itself or in its wiring.

    If the thermostat is working but the compressor condenser unit won't start, you could skip ahead
    to COMPRESSOR / CONDENSER DIAGNOSTICS but I wish you'd double check the remaining steps in this article first because there are some sneaky snafus listed below that might still be the problem.

  3. Check that electricity is on for the equipment. Check all of the electrical switches and controls that can turn electrical power off at the indoor air handler or at the outdoor compressor/condenser unit. There are more of these switches than you might guess. Here's a list of what to check:

    Electrical power switches and service switches outside by the compressor, inside at the air handler, and fuses or circuit breakers in the electrical panel. Don't forget to check that the access covers to the equipment are properly closed and latched. Otherwise a
    BLOWER DOOR SAFETY SWITCH could be keeping the equipment from running.

    There are several other safety switches and controls, both manual and automatic that can leave an air conditioner or heat pump turned "off" such as a blower compartment door interlock safety switch, an electric motor overload or overheat switches, and a condensate tray spillage detector switch.

    Some hard-to-find electrical switches on an air conditioner or heat pump could be keeping your air conditioner from starting, such as
    a FLOAT SWITCH on Condensate Tray that could
    be
    causing CONDENSATE PAN SWITCH LOCKOUT - condensate spilling into an overflow pan that uses a sensor switch can be enough to shut down your air conditioner.
    or
    a blower MOTOR OVERLOAD RESET SWITCH could be keeping a fan motor from starting.

    A bad or failed starter capacitor could also be leaving your system shut down, failing to start a blower, fan, or compressor motor.
    See CAPACITORS for HARD STARTING MOTORS

    Watch out: See A/C - HEAT PUMP CONTROLS & SWITCHES to be sure you have found and checked everymanual or automatic electrical switch on the system.
  4. Check the electrical supply voltage. Even if electricity is on, if the supply voltage has fallen too far below the operating voltage range of your air conditioner it's likely that the system will not operate, particlarly, you may note that the compressor motor won't start.
    See VOLTS MEASUREMENT METHODS

Aug 22, 2017 | Goodman Heating & Cooling

1 Answer

Why doesn't the condenser shut off automatically when the set temperature is reached?


There is probably a stuck "contactor" on the condenser. Where the line voltage wires from your house connect to the unit there is a contactor. That part has a small set of contacts/points that open & close upon demand allowing voltage to feed through the unit. Those points are welded/stick together. A 2 pole 40amp contactor should fox it.

Jul 28, 2015 | Heating & Cooling

1 Answer

Replaced capacitor on fan in air handler now condenser will not run and fan on air handler will not shut off


fan relay stuck in & control fuse might be blown. see if you have 24 volts at outside unit.

Jan 17, 2013 | Gibson Heating & Cooling

1 Answer

Central ac compressor keeps running


Sounds like the contactor is stuck. Turn the power off on both units and remove panel on condenser. Pull out on the contactor if engaged. Likely still needs replaced, it's going to happen again.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

Jul 25, 2017 | Heating & Cooling

2 Answers

My A/C freezing its coils, while the fans keep running. The AC unit (outside) keep running and never stop caused the coils freezing. It doesn't matter when I turn off or set it to Cool position, the...


Sounds like the contactor in the condensing unit is stuck. That is why it will not turn off when the thermostat is satisfied. If the inside air handler is not blowing and the outside condensing unit is running, then this will cause the inside coils to freeze up rather quickly.
The contactor is located in the outside condensing uni in the electrical compartment.
If it is sticking it will need to be replaced.

Sep 07, 2011 | Heating & Cooling

1 Answer

My thermostat when prgrammed and set on "auto" mode kicks on heat when temp drops below set temperature. The problem is that after warming up to that temperature...it does not shut the fan off. ...


I have a honeywell TH8320U thermostat and American standard Air handler with heating unit put in. THE thermostat works fine with the ac and follows the programs I have set. However the heat is a different story. The thermo clicks on to follow program but the unit does not run. (auto settings) If I place the thermo in heat and turn it to on I get heat?

Dec 08, 2010 | Honeywell Programmable Thermostat Heater

1 Answer

FAN STAYS ON LONG (HOURS) AFTER COOLING TEMP IS ACHIEVED


There is a built in delay on all HVAC systems to evacuate conditioned air (hot or cold) from the ducts -- it's just more efficient that way... but if it's staying on for more that 4-5 minutes at most then there may be a problem with the fan relay... or possibly a limit switch.

Sep 02, 2009 | Heating & Cooling

1 Answer

Air conditioner compressor keeps shutting down


This is due to thermal overload,Which can be caused by low oil in the compressor,the fan has stopped running on the unit outside,Dirty coils,or just a worn out compressor.Although this is thermal overload,It has nothing to do with outside temperature,But rather the internal temperature of the compressor itself.

May 19, 2009 | LG Heating & Cooling

1 Answer

Air handler will not run clogged up drain?


the air handler is in the attic or in a closet right? most likely the drain switch mentioned is in a pan located underneath the air handler, the switch is actuated when the condensation drain tube is clogged, ( when it cannot drain the water out of the pan), the float switch is actuated and the unit shuts off to prevent any more condensation, thus preventing overflow into your house/apt. the drain line can be sucked out by using a simple wet/dry vacuum of any kind from the end of the drain line ( usually a 3/4 inch PVC pipe located somewhere outside ).

Aug 14, 2008 | Heating & Cooling

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