Scotsman CME855A - Manual (Page 21)

SERVICE DIAGNOSIS
SYMPTOM POSSIBLE CAUSE PROBABLE CORRECTION
No ice, machine does not run 1. No electrical power 1. Restore power
2. Circuit breaker tripped or fuse
blown 2. Reset breaker or replace fuse,
check for electrical fault.
3. High pressure control open. 3. Reset HPC, check fan motor
for proper operation, and
condenser coil for dirt.
4. Bin Thermostat holding
machine off 4. Check bin thermostat.
5. High temp. cut out open 5. Hot gas valve leaks thru,
replace hot gas valve
6. Timer switch open 6. Replace timer
7. Master switch open 7. Check or replace switch.
8. Circuit board open 8. Replace circuit board.
No ice, compressor does not run,
rest of ice machine does. 1. Open contactor coil 1. Replace contactor
2. Thermostatic Expansion valve
clogged or does not open. 2. Check/replace TXV.
No ice, no water over evaporators 1. Water pump does not pump 1. Check/replace water pump
2. No water in reservoir 2. Check/replace water inlet valve.
No ice, everything runs 1. Too much heat load 1. Check for slow leak thru of
water inlet valve.
2. Low on refrigerant 2. Check pressures, if low
find/repair leak; weigh in charge.
3. Suction pressure too high 3. Defective compressor - replace
Low ice production 1. Too much heat load. 1. Check condenser air inlet
temperature. Check water
temperature.
2. Compressor inefficient. 2. Replace compressor
3. Non condensable gasses in
refrigeration system. 3. Check head pressure, if very
high, and no other reason is
suspected, replace refrigerant
charge.
CME855A & CME1000A
October, 1994
Page 21