Ran harvest cycle using small drive gear to initiate cycle. Heating coil did not function. Water solenoid valves did not operate. Removed ice maker. Tested water solenoid valves. Tested OK. Ran continuity checks of wiring to solenoid valves. Found no issues. Tested diode. OK. Provided 110V power to ice maker and ran harvest cycle. Harvesting fingers ran 1 rotation and provided approx. 7 second power output to solenoid valve lead connection near end of this cycle. Problem appears to be either defective thermostat or shut off switch. Ordered new ice maker.