How to Fix / Troubleshooting

Safety: Turn off power before working on sensors.

Find harvest thermistor: On many Scotsman models, the same thermistor is used for both freeze and harvest sensing; on others, a separate sensor is used. Verify it is properly clipped to the correct location.
Inspect for damage: Look for crushed or cut sensor wires and damaged insulation.
Test sensor: Use a multimeter to measure resistance and compare to the service chart. A reading near zero ohms indicates a shorted sensor. Replace if defective.
Check harness routing: Ensure the harness is not pinched by panels or brackets causing intermittent shorts.
Control board: If sensor and wiring are good, the control board may be mis-timing harvest and should be evaluated for replacement.

Display shows 'E4' and unit will not start or stops quickly

Possible Causes