Service Diagnosis - Scotsman CME1000A User Manual

SERVICE DIAGNOSIS

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