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Condensing unit not
running.
Compressor not
running.
1. No power to unit.
2. Low pressure control defective, or
incorrectly
set.
3. Refrigerant leak.
1. Defective starting relay.
2. Defective starting capacitor.
3. Defective run capacitor
4. Defective compressor.
1. Check that circuit breakers/disconnect
are
on.
2. Check control, adjust or replace.
3. Identify and repair leak.
1. Replace relay.
2. Replace capacitor.
3. Replace capacitor.
4. Replace compressor.
Step 2: Check outdoor condensing unit
Bubbles in sight
glass and/or incorrect
system pressures.
1. Mineral build-up on evaporator surface.
2. Dirty condenser coil.
3. Restricted airflow to condenser.
4. High outdoor temperature.
5. Defective condenser fan.
6. Low refrigerant charge.
7. Insufficient refrigerant charge for low
ambient
operation.
8. Defective head pressure control valve.
9. Inefficient compressor.
10. Faulty expansion valve(s).
1. Clean evaporator with liquid icemaker
cleaner.
2. Clean condenser.
3. Remove obstruction.
4. Verify ice production capacity.
5. Replace condenser fan.
6. Check for leaks; repair, evacuate, and
re-charge refrigeration system.
7. Check system charge.
8. Replace head pressure control valve.
9. Replace compressor.
10. Replace expansion valve.
Problem: Low ice production
Step 1: Check evaporator unit
Problem: Outdoor unit cycles frequently during off cycle
Step 1: Check evaporator unit
Suction pressure rises
during off cycle.
1. Leaking liquid line solenoid valve.
2. Excessive leak back through compressor
valves.
1. Replace solenoid valve.
2. Replace compressor
Check system
pressures.
1. Low refrigerant charge.
2. Low pressure control defective, or
incorrectly
set.
3. Tripping head pressure control.
1. Check for leaks; repair, evacuate, and
re-charge refrigeration system.
2. Check control, adjust or replace.
3. Clean condenser, check fan motor
Problem: Outdoor unit cycles intermittently during run cycle
Step 1: Check condensing unit
