TROUBLESHOOTING
| PROBLEM |
| SOLUTION |
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 | |
3. No control power. |
| size fuse. | |
3. | Check secondary fuse(s); replace with correct type and | ||
|
|
| size. Replace transformer if primary windings receiving |
4. | Thermostat circuit open. |
| power. |
4. | Check thermostat setting. | ||
5. | 5. | Check timer for proper operation; replace if defective. | |
6. | Compressor circuit breaker tripped. | 6. | Check for excessive compressor current draw. Reset |
7. | Safety device lockout circuit active. |
| breaker; replace if defective. |
7. | Reset lockout circuit at thermostat or circuit breaker. | ||
8. | 8. | Check for refrigerant undercharge, obstruction of indoor | |
|
|
| air¯ow, or whether compressor suction shutoff valve is |
|
|
| fully open. Make sure liquid line solenoid valve(s) is |
9. |
| open. | |
9. | Check for refrigerant overcharge, obstruction of outdoor | ||
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|
| air¯ow, air in system or whether compressor discharge |
|
|
| valve is fully open. Be sure outdoor fans are operating |
10. Discharge gas temperature switch open. |
| correctly. | |
10. | Check for open condition. Allow for reset. Replace if | ||
11. | Loose electrical connections. |
| defective. |
11. | Tighten all connections. | ||
12. Compressor stuck. | 12. | See 06E compressor service literature. | |
Contactor Closed |
|
| |
1. | Compressor leads loose. | 1. | Check connections. |
2. | Motor windings open. | 2. | See 06E compressor service literature. |
3. | Single phasing. | 3. | Check for blown fuse. Check for loose connection at |
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|
| compressor terminal. |
COMPRESSOR STOPS ON |
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| |
Outdoor Fan On |
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| |
1. | 1. | Replace switch. | |
2. | Air¯ow restricted. | 2. | Remove obstruction. |
3. | Air recirculating. | 3. | Clear air¯ow area. |
4. | Noncondensables in system. | 4. | Purge and recharge as required. |
5. | Refrigerant overcharge. | 5. | Purge as required. |
6. | Line voltage incorrect. | 6. | Consult power company. |
7. | Refrigerant system restrictions. | 7. | Check or replace ®lter drier, expansion valve, etc. Check |
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|
| that compressor discharge 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. |
COMPRESSOR CYCLES ON |
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| |
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| ||
1. | Filter drier plugged. | 1. | Replace ®lter drier. |
2. | Expansion valve power head defective. | 2. | Replace power head. |
3. | Low refrigerant charge. | 3. | Add charge. Check |
Air¯ow Restricted |
|
| |
1. | Coil iced up. | 1. | Check refrigerant charge. |
2. | Coil dirty. | 2. | Clean coil ®ns. |
3. | Air ®lters dirty. | 3. | Clean or replace ®lters. |
4. | Dampers closed. | 4. | Check damper operation and position. |
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| ||
1. | Electrical connections loose. | 1. | Tighten all connections. |
2. | Fan relay defective. | 2. | Replace relay. |
3. | Motor overload open. | 3. | Power supply. |
4. | Motor defective. | 4. | Replace motor. |
5. | Fan belt broken or slipping. | 5. | Replace or tighten belt. |
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