Fridgedaire PHSC39EESS5 Double Door Defrost Icing

[tigerpilot]

Bad ice buildup.  Used heat gun to clear.  Replaced coil thermostat. I have a recording Bluetooth thermometer In the refrig part.  Not seeing heater come on in 18 hours. Heater resistance is correct. Since I don’t think there is a timer, what actually switches the heater on?  It appears that the thermostat is in series with one heater lead but just wondering if that’s it?  Maybe it takes a lot of hours before the increase temp in the refrig. 
I appreciate all replies.  Thanks, Don

[Vance R]

1 hour ago, tigerpilot said:

what actually switches the heater on?

"This product comes equipped with an Adaptive Defrost Control (ADC). To activate manual defrost, press and hold the Freezer temperature UP (WARMER) key while pressing the Fresh Food temperature DOWN (COLDER) key 5 times within 6 seconds. A “d” in the freezer temperature window and “F” in the refrigerator temperature window will display when the heater is activated. To deactivate manual defrost, press and hold Freezer temperature UP (WARMER) key while pressing the Fresh Food temperature DOWN (COLDER) key 5 times within 6 seconds. “d” and “F” will be displayed until the defrost cycle is complete. (approx. 8 minutes)."

[tigerpilot]

Thanks for the fast response.  Trying that did not help.  Nothing different show in the display.  Tried it several times, waited a while and then tried it the opposite way.  Still nothing.  The temps have been perfect for more than 36 hours but I have not idea how hard the compressor is working to achieve that. Any other ideas are very welcome.

Don

[tigerpilot]

Sorry about the last post.  It seems I’m just learning to read EVERY word you wrote. Manual defrost turned on whenI followed your instructions.  Now I need to get the defrost working by itself.  Thanks again.

Respectfully, Don