The Virtual Repairman's Appliance Help

[ohzaroo]

model # HSS25GFTAWW
serial # DM212787

i'm having problems with a side by side fridge the is making too much frost on the top of the evaporator. i tested the element and it tested fine. i replaced the main control board and the defrost thermostat.
i'm assuming that evaporator thermistor is fine since the evaporator fan is running fine. it comes on and off normally.
after i replaced that control board, i let the evaporator defrost until all the frost was gone and then i plugged in the unit. the fridge worked fine for about 21 days. once again, there is a lot of frost on the top of the evaporator.
would a bad freezer thermistor cause the compressor to run more than it has to?
if you could please help,
thanks

[Virtual Repairman]

If you have not changed any of the thermisters, do so. If any one of them is bad, it will make the board skip the defrost cycle. I always replace both of them in the freezer. There is one at the evaporator and another on the lower left wall.
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