| TROUBLESHOOTING | ||
SYMPTOM AND PROBABLE CAUSE | PROBABLE REMEDY | ||
COMPRESSOR DOES NOT RUN |
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1. Control circuit breaker tripped | 1. Reset control circuit breaker | ||
2. Power line open | 2. Reset circuit breaker | ||
3. Oil pressure switch tripped | 3. Reset oil pressure switch at unit | ||
4. Safety device tripped | 4. Reset control circuit with thermostat | ||
5. Contactor stuck open | 5. Replace contactor | ||
6. Loose terminal connection | 6. Check connections | ||
7. Improperly wired controls | 7. Check and rewire | ||
8. Seized compressor | 8. Check motor winding for open or short. | ||
9. Low line voltage |
| Replace compressor, if necessary | |
9. Check line voltage Ð determine location of | |||
10. Compressor motor defective |
| voltage drop and remedy de®ciency | |
10. Check motor winding for open or short. | |||
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| Replace compressor, if necessary |
COMPRESSOR STOPS ON |
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CONTROL |
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1. Compressor suction shutoff valve partially closed | 1. Open valve | ||
2. | Low refrigerant charge | 2. | Add refrigerant |
3. | Liquid line solenoid valve(s) fails to open | 3. | Check liquid line solenoid valve for proper |
4. | Liquid line shutoff valve closed | 4. | operation. Replace if necessary |
Open valve | |||
COMPRESSOR STOPS ON |
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CONTROL |
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1. | Compressor discharge valve partially closed | 1. | Open valve or replace if defective |
2. | Air in system | 2. | Purge and evacuate system |
3. | Condenser fan(s) not operating | 3. | Check motor wiring and repair or replace if |
4. | System is overcharged. | 4. | defective |
Reclaim charge as needed | |||
UNIT OPERATES TOO LONG OR |
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CONTINUOUSLY |
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1. | Low refrigerant charge | 1. | Add refrigerant |
2. | Control contacts fused | 2. | Replace control |
3. | Air in system | 3. | Purge and evacuate system |
4. | Partially plugged expansion valve or ®lter drier | 4. Clean or replace | |
SYSTEM IS NOISY |
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1. | Piping vibration | 1. | Support piping as required |
2. | Compressor noisy | 2. | Check valve plates for valve noise. Replace |
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| compressor if bearings are worn |
COMPRESSOR LOSES OIL |
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1. | Leak in system | 1. | Repair leak |
2. | Crankcase heaters not energized during | 2. | Check wiring and relays. Check heater and |
3. | shutdown | 3. | replace if defective |
Improper interconnecting piping design | Check piping for oil return. Replace if | ||
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| necessary |
FROSTED SUCTION LINE |
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1. | Expansion valve admitting excess refrigerant | 1. | Adjust expansion valve |
HOT LIQUID LINE |
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1. | Shortage of refrigerant due to leak. | 1. | Repair leak and recharge |
2. | Expansion valve opens too wide | 2. | Adjust expansion valve |
FROSTED LIQUID LINE |
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1. | Restricted ®lter drier | 1. Remove restriction or replace | |
COMPRESSOR WILL NOT UNLOAD |
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1. | Defective unloader | 1. | Replace |
2. | Defective capacity control solenoid valve | 2. | Replace valve |
3. | Miswired liquid line solenoid | 3. | Rewire correctly |
4. | Weak, broken, or wrong valve body spring | 4. | Replace spring |
COMPRESSOR WILL NOT LOAD |
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1. | Miswired capacity control liquid solenoid | 1. | Rewire correctly |
2. | Defective capacity control solenoid valve | 2. | Replace valve |
3. | Plugged strainer (high side) | 3. | Clean or replace strainer |
4. | Stuck or damaged unloader piston or piston | 4. | Clean or replace the necessary parts |
| ring(s) |
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