Scotsman FME1500R Service Manual page 25

SERVICE DIAGNOSIS: Condition - No Ice Being Produced
STATUS: GEARMOTOR OPERATES, COMPRESSOR DOES NOT
B. Check the compressor relay.
The relay is on the circuit board, if it does not supply power to the liquid line valve coil, the low pressure
control will not close, and the compressor will not run.
1. Check for power at the liquid line valve coil, if none:
a. Check for power at the compressor relay at the circuit board. If there is power
at the relay, but none at the coil,
Check for an open wire between the relay and the coil.
2. Check the coil. If the coil is open, replace the liquid line valve.
3. Check the auger drive motor centrifugal switch. If, when the drive motor is running, contact
4 (black wire removed) has no power, and all of the above switches have been checked, replace
the centrifugal switch, or the drive motor.
4. If the compressor relay on the circuit board has power on the NO contact, but not on the COM contact,
replace the circuit board.
C. Check the compressor contactor.
1. If the liquid line valve is open, and the gearmotor is running, the low pressure control should be closed,
and the compressor contactor should be energized. If not:
a. Check for power at the gearmotor terminal to the contactor, if none:
Replace the drive motor or the centrifugal switch in the drive motor.
b. Check for power at the high pressure control, if none, check that control.
c. Check the coil of the contactor, if open, replace the contactor.
D. Check the compressor
1. Check for power at the compressor: check the start relay, and start capacitor.
2. Check the windings of the compressor for open windings or shorts to ground.
Replace those items found defective.
August 1993
Page 25
FME1500R