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Frigidaire Refrigerator PHSC39EESS5 not going into defrost cycle

tigerpilot

Premium Member
Joined
Oct 11, 2006
Messages
9
Location
Naples, FL
Model Number
PHSC39EESS5
Brand
Frigidaire
Age
6-10 years
Coil was frozen. Changed thermostat. Did a manual defrost. Both sides working fine. All fans working. I have a recording thermometer placed in the coil compartment. The temperature has stayed within two degrees from zero for more than 30 hours. Fridge has ADC system. After the thermostat closes, what tells the system to go into a defrost cycle. It used to go about every six hours. Something isn’t working. Thinking control board in fridge section. Would like your input. Thanks, Don
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
123,974
Location
McMullen Valley, Arizona
You have only 3 parts that control the defrost circuit: The main control board, the defrost thermostat, and defrost heater.

So if the defrost ohms good while its frosty(should be 0-1 ohms) and the defrost heater ohms good(should be under 50 ohms) Then the problem is the main control board.

After the thermostat closes, what tells the system to go into a defrost cycle.
The main control board does.

Here's the main control board for your model:
241511102 Board-Main Power


Jake
 
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