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Hello, this is Dave and I welcome you to JustAnswer. I'm reviewing your question now, and will post back with your reply ASAP.
When it stops making ice, what is running on the icemaker? Is water circulating? Is the fan underneath running etc.?
Okay, here is what to look for so we can find the issue. Is water circulating? Is there a slab of ice visible above the cutter grid? It may be only part way off the cooling plate. Is the fan blowing air out the left side in the front? Let me know what happens after it stops making ice.
So far that is normal. If all continues the slab of ice should drop to the cutter grid in 15 to 25 minutes after water starts to circulate. Let me know what happens.
Your icemaker has two thermistors. One on the side of the bin and one under the evaporator. Which one did you replace?
If that one was a problem it would not run at all. We will need to wait until it stops again and see what is or isn’t doing. Can you let me know in a while?
I will check back in a while.
I suspect it is trying to harvest but the ice slab is not dropping off the cooling plate. Can you shine a flashlight up through the cutter grid, (if there is no ice there) and see if there is a thick slab on the cooling plate? If there is a slab on the cutting wires is it a full square slab? It should drop a slab every 25 minutes or less.