TROUBLESHOOTING COOLING CHART
SYMPTOM | CAUSE | REMEDY | |
Compressor and con- | Power failure | Call power company. | |
denser fan will not |
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Fuse blown or circuit breaker tripped | Replace fuse or reset circuit breaker. | ||
start. | |||
Defective thermostat, contactor, transformer, | Replace component. | ||
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| or control relay |
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| Insufficient line voltage | Determine cause and correct. | |
| Incorrect or faulty wiring | Check wiring diagram and rewire correctly. | |
| Thermostat setting too high | Lower thermostat setting below room temperature. | |
| DO NOT bypass this compressor time delay Ð wait | ||
| (50SS048,060 and 50SX) have a | for 5 minutes until | |
Compressor will not | Faulty wiring or loose connections in | Check wiring and repair or replace. | |
start but condenser | compressor circuit |
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fan runs. | Compressor motor burned out, seized, or | Determine cause. Replace compressor. | |
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| internal overload open |
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| Defective run/start capacitor, overload, | Determine cause and replace. | |
| or start relay |
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| One leg of | Replace fuse or reset circuit breaker. | |
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| Determine cause. | |
Scroll compressor is rotating in the | Correct the direction of rotation by reversing the | ||
compressor | wrong direction | ||
(50SS048, 060; |
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units only) makes ex- |
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cessive noise, and |
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there may be a low |
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pressure differential. |
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Compressor cycles | Refrigerant overcharge or undercharge | Reclaim refrigerant, evacuate system, and recharge | |
(other than normally |
| to capacities shown on nameplate. | |
satisfying thermostat). |
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Defective compressor | Replace and determine cause. | ||
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| Insufficient line voltage | Determine cause and correct. | |
| Blocked condenser | Determine cause and correct. | |
| Defective run/start capacitor, overload | Determine cause and replace. | |
| or start relay |
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| Defective thermostat | Replace thermostat. | |
| Faulty | Replace. | |
| Restriction in refrigerant system | Locate restriction and remove. | |
Compressor operates | Dirty air ®lter | Replace ®lter. | |
continuously. | Unit undersized for load | Decrease load or increase unit size. | |
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| Thermostat set too low | Reset thermostat. | |
| Low refrigerant charge | Locate leak, repair and recharge. | |
| Leaking valves in compressor | Replace compressor. | |
| Air in system | Reclaim refrigerant, evacuate system and recharge. | |
| Condenser coil dirty or restricted | Clean coil or remove restriction. | |
Excessive head | Dirty air ®lter | Replace ®lter. | |
pressure. |
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Dirty condenser coil | Clean coil. | ||
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| Refrigerant overcharged | Reclaim excess refrigerant. | |
| Air in system | Reclaim refrigerant, evacuate system and recharge. | |
| Condenser air restricted or air | Determine cause and correct. | |
Head pressure too low. | Low refrigerant charge | Check for leaks, repair and recharge. | |
| Compressor valves leaking | Replace compressor. | |
| Restriction in liquid tube | Remove restriction. | |
Excessive suction | High heat load | Check for source and eliminate. | |
pressure. |
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Compressor valves leaking | Replace compressor. | ||
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| Refrigerant overcharged | Reclaim excess refrigerant. | |
Suction pressure too | Dirty air ®lter | Replace ®lter. | |
low. |
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Low refrigerant charge | Check for leaks, repair and recharge. | ||
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| Metering device or low side restricted | Remove source of restriction. | |
| Insufficient evaporator air¯ow | Increase air quantity. Check ®lter Ð replace if | |
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| necessary. | |
| Temperature too low in conditioned area | Reset thermostat. | |
| Outdoor ambient below 40 F | Install | |
| Replace. | ||
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