Manitowoc Ice CM MODEL STH003 - Manual (Page 42)

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5. Verify the “Power” switch functions properly.
• If the red control board light is energized and
depressing the “Power” switch does not
energize the green “Power” light, check the
interconnecting wire, then replace the
interface board.
6. Verify the bin thermostat functions properly.
• The green “Power” light will be energized and
the ice machine will function in the “Clean”
cycle with the bin thermostat is open.
7. Check control board light to see if ice machine
shutdown on over temperature limit (control board
light will flash rapidly).
8. Replace the control board.
• Be sure Steps 1-6 were followed thoroughly.
Intermittent problems are not usually related
to the control board.