Question about Refrigerators
you have a defrost issue not being able to verify circuits on the mother board i would replace the high limit, what you are calling the termination stat this stat stays closed unless the temp hits 140, thats right 140 degrees f and change the evaperator sensor.
evap sensor can cause missed defrosts or no defrosts
high limit part number wr50x10068
sensor number is wr55x10025
Posted on Jun 09, 2009
chek this sites to ve an indepth knoledge
1. The evaporator fan should only be on when the compressor is running.
Not when the fridge is in defrost.
2. it would be best to check for 120 volts while the fridge is on and not in defrost.
3. There should be a light amount of frost on the cooling lines.
But if the fan isn't working then there will normally be more frost then you would usually see.
If the fan is getting 120 volts while the fridge is on then you will have to replace the Evaporator Fan Motor
Try removing the access panel in the freezer section to expose the evaporator coils. If the coils in the freezer section get clogged with frost, it will block the evaporator fan motor from blowing the cold air. The fan blade could also hit the frost and become noisy, or stop altogether.
DEFROST TIMER, THERMOSTAT & HEATER
You can locate the defrost timer, but it can be tricky, since they are often hidden behind the back bottom corners of the fridge. In the last few years the timers have been located in the ceiling of the fresh food section, and some behind the cold control cover. Once you locate the defrost timer, slowly turn the screw-like wheel, in the middle of the defrost timer, with a screwdriver until the fridge shuts off. Now the fridge is in defrost mode. If the defrost heater comes on now, replace the defrost timer and defrost thermostat. If the heater does not come on, you can ohm test the defrost heater for continuity or volt test for 120 volts to the heater. If you have no power to the heater, you can also bypass the defrost thermostat to see if the heater will come on; join the two wires together, to bypass the thermostat. If the heater now comes on, replace the defrost timer and defrost thermostat. If the heater itself is bad, defrost the fridge with a hair dryer, replace the defrost heater and defrost thermostat. If the defrost timer seems "hot" to the touch or is noisy or ticking, replace it.
chek this link too
Hope u will b helpfull
Posted on Jun 04, 2009
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Posted on Jan 02, 2017
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