Question about Refrigerators
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Posted on Jan 02, 2017
First point: The entire fridge is cooled by the freezer section. A fan blows air across to the food section.
2) Every 8 hours or so, a timer shuts off the compressor cycle, and starts up a heater to defrost the freezer coils. If the heater(s) are burnt out, or if the safety thermostat (to prevent overheating) is open, then you will have no defrost. The coils will frost up and eventually prevent airflow to the food section. Milk goes sour.
3) In rare circumstances, the timer itself can stall. This cause the same symptoms as above, but this is not as common as the other 2 causes of No Defrost.
Sequence: Check heater continuity. Check safety thermostat continuity while cold. Check defrost timer operation.
Hope this helps. I am a journeyman with 39 years exp. Happy New Year.
Posted on Jan 01, 2009
There are 3 things to look for on the TFH22PRSAAA refrigerator when this happens. First we need to have a look inside the rear of the freezer and see is there is frost build up on the rear back panel that covers the evaporator. If yes you the next thing to do is look inside the fresh food compartment for the defrost timer located behind the control panel as shown in the photo below. I want you to turn the defrost timer clockwise until the compressor motor and fans stop. The refrigerator should be in the defrost mode now. Open the freezer door and listen for crackling and sizzling cause by the defrost heater being on. If there is no sounds or changes the you need to let me know. The timer should turn the refrigerator back on after 25 minutes. If not simply turn the timer again slowly clockwise until the compressor restarts. If you need to do this you will need to replace the defrost timer because the timer is no longer running as a timer and has become defective. I am going to stop here because I don't want you to think this is too hard to do It's easy to do these test and I will be here to assist you. Let me know when you are ready or if you fell you have it under control please rate my solution when were finished the repair, Thanks, Sea Breeze
Posted on Aug 14, 2009
I can tell you how to find the problem , but , it is a little work .
Pull the refrig out and remove the 8 " x 10 " panel . Behind this panel , is the main control board . Unplug the refrig . Remove the BLUE plug from the board , with 3 larger wires going to it . Looking at the blue plug , the sequence will be wire1,wire2,space,wire3 . Get a short piece of insulated wire , and strip about 1/4 inch from each end . Insert 1 end into wire2 , and the other into wire3 . Plug the refrig back in . After about 3 min , look in the freezer , at the bottom , behind the crisper , look for a red glow . If no red glow , unplug the refrig , and reassemble the plug and cover . This no glow , indicates a shorted defrost heater WR51X10055 . It is also advisable to replace the defrost thermostat ( pt. number WR50X10068 ) when replacing the heater . To access these parts , you will have to remove the inside rear wall of the freezer . The heater , is at the bottom of the coils , held on with 2 screws , and the thermostat , is the 1 " cylinder , with a blue and pink wire going to it , clipped on the top left of the coils .
If you do get a red glow , then the # 4 thermistor is bad . This tells the main control board , the temp of the coils , if they need defrosted , when they are thru defrosting . This thermistor is the 1 " long , torpedo looking piece , clipped on the top left of the coils , with 2 white wires going to it . Part number WR55X10025 . It would be advisable to also replace the # 5 thermistor , located at the bottom of the freezer , slightly in front of the drain , also with 2 white wires going to it , slid into a housing . This thermistor , is the freezer thermistor , which tells the control board , the freezer temp , and , when to cycle off due to temp satisfied .
Posted on Jan 02, 2010
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