My GE Monogram clear ice maker (Model ZD115CBBG) runs 1 cycle making ice as it should and then it goes into cleaning mode with the red light flashing. I have run nickle safe cleaner through it numerous times, cleaned the hoses and pump as best I can, as well as cleaned the compressor compartment, cooling coils, etc. The drain is clear so it drains rapidly. What triggers the clean cycle on these? Thanks.