The Lights Responded, but Neither Ice Production nor Clean Would Start

• The appliance was described as a standalone Sub-Zero ice machine.
• The interior light operated and the power button produced a response.
• Ice production did not begin.
• The cleaning function and fan also did not start.
• Replacing both the main control and user-interface board did not change the symptom.

The same symptom can have a different cause on another ice machine. The source did not identify a final failed part.

The discussion identified the thermostat, circulation pump and a switch input as the next points to verify. The technician reported no power arriving at the thermostat, so the useful question became where power or an enable signal stopped between the board and that circuit.

A sequence-of-operation document was recommended to establish which input must close before each load is allowed to run. No measurement trail or completed repair followed.

1. Record which display, light and button responses remain available.
2. Check whether both ice-making and cleaning modes fail at the same point.
3. Use the model-specific sequence to identify required thermostat and switch states.
4. Verify the supply and connector path to each required input with power safely isolated.
5. Do not replace a third board without locating the missing command or input.