TROUBLESHOOTING
| PROBLEM |
| SOLUTION |
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COMPRESSOR DOES NOT RUN |
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Contactor Open |
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1. | Power off. | 1. | Restore power. |
2. | Fuses blown in ®eld power circuit. | 2. After ®nding cause and correcting, replace with correct size fuse. | |
3. | No control power. | 3. | Check secondary fuse(s); replace with correct type and size. |
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| Replace transformer if primary windings receiving power. |
4. | Thermostat circuit open. | 4. | Check thermostat setting. |
5. | Time Guard II device not operating. | 5. | Check Time Guard II devices. |
6. | Compressor circuit breaker tripped. | 6. | Check for excessive compressor current draw. Reset breaker; |
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| replace if defective. |
7. | Safety device | 7. | Reset |
8. | 8. | Check for refrigerant undercharge, obstruction of indoor air¯ow, or | |
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| whether compressor suction shutoff valve is fully open. Make sure liquid |
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| line solenoid valve(s) is open. |
9. | 9. | Check for refrigerant overcharge, obstruction of outdoor air¯ow, air in | |
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| system, or whether compressor discharge valve is fully open. Be sure |
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| outdoor fans are operating correctly. |
10. | Compressor overtemperature switch open. | 10. | Check for open condition. Allow for reset. Replace if defective. |
11. | Loose electrical connections. | 11. | Tighten all connections. |
12. | Compressor stuck. | 12. | See compressor service literature. |
Contactor Closed |
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1. | Compressor leads loose. | 1. | Check connections. |
2. | Motor windings open. | 2. | See compressor service literature. |
3. | Single phasing. | 3. | Check for blown fuse. Check for loose connection at compressor terminal. |
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COMPRESSOR STOPS ON |
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Outdoor Fan On |
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1. | 1. | Replace switch. | |
2. | Reversed fan rotation. | 2. | Con®rm rotation, correct if necessary. |
3. | Air¯ow restricted. | 3. | Remove obstruction. |
4. | Air recirculating. | 4. | Clear air¯ow area. |
5. | Noncondensables in system. | 5. | Purge and recharge as required. |
6. | Refrigerant overcharge. | 6. | Purge as required. |
7. | Line voltage incorrect. | 7. | Consult power company. |
8. | Refrigerant system restrictions. | 8. | Check or replace ®lter drier, expansion valve, etc. Check that compressor |
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| discharge service valve is fully open. |
Outdoor Fan Off |
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1. | Fan slips on shaft. | 1. | Tighten fan hub setscrews. |
2. | Motor not running. | 2. | Check power and capacitor. |
3. | Motor bearings stuck. | 3. | Replace bearings. |
4. | Motor overload open. | 4. | Check overload rating. Check for fan blade obstruction. |
5. | Motor burned out. | 5. | Replace motor. |
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COMPRESSOR CYCLES ON |
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1. | Compressor suction service valve partially | 1. | Open valve fully. |
| closed. |
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2. | Liquid line solenoid valve(s) fails to open. | 2. | Check liquid line solenoid valve(s) for proper operation. Replace if |
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| necessary. |
3. | Filter drier plugged. | 3. | Replace ®lter drier. |
4. | Expansion valve power head defective. | 4. | Replace power head. |
5. | Low refrigerant charge. | 5. | Add charge. Check |
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