Scotsman MCM1062R User Manual download pdf (Page 23)

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 level control holding machine

off

4. Check ice level control circuit.

See page 25.

5. High temp. cut out open 5. Hot gas valve leaks thru, replace

hot gas valve

6. Timer switch open 6. Replace timer

7. On/Off 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. Compressor on/off switch open 1. Check or replace switch

2. Open contactor coil 2. Replace contactor

3. Liquid line valve does not open 3. Check electrical connections to

liquid line valve, check coil, check

valve operation

4. Pump down pressure switch

does not close

4. Defective switch, or liquid line

valve does not open, or low on

refrigerant; check/replace

5. Thermostatic Expansion valve

clogged or does not open.

5. 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 and

water temperatures.

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.

MCM1062R

October 1993

Page 23

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MCM1062R 1

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Scotsman MCM1062R User Manual Page 23

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