On something like this you will need the test mode set up instructions & error code list in order to know the correct failure codes & type of action to take. Please see the image provided for the test mode instructions & error code list. Once we know the error code we will have a direction to head into. I suspect a thermister or wiring problem with this type of symptom. Be sure to
before attempting to remove panels or service the unit.
SAFETY NOTICE: Be sure to disconnect power to the appliance before performing any repairs. If you are not comfortable with doing any voltage checks that might be recommended, please contact your local service provider for repairs. Be aware that there could be sharp edges inside the appliance that could cause cuts or other injuries to yourself or others.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services