KitchenAid KRFF507ESS01

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Brand:Kitchen Aid
Model Number: KRFF507ESS01
Main Symptom:Slow or Not Making Ice
What happens & when: The ice maker is not producing enough ice. Will not fill bucket and when set to max ice there is no difference. It would do this before and the evaporator would be found frozen over. After I would manual defrost it would go to working again for a few months. I replaced the defrost thermistor and it has worked great for about a year. I have not reopened the evaporator compartment to confirm if its frozen over or not. The fan is blowing as it should. Let me say Ive completed all the test ion the tech sheet and nothing fails or gives error codes. I can use the tech sheet and force a harvest and it works properly and refills and freezes without issues. Its just not harvesting. At this point I’m not sure if its the eye that sees the bucket full or another safety like a faulty door switch. I do not want to just throw parts at it.

Error Code (if any):N/A
Parts or tests already tried: Ice maker replaced 12 months ago due to error code lost home; Tube heater replaced failed; defrost thermistor replaced due to evaporator coil freezing up;
Photos / video link:

If the unit will cycle during diagnostics but will not during the regular cycle, this would typically be a icemaker issue but would suggest checking to make sure that the temperature in the compartment is getting to around 0 degrees.