Table 43 — Cooling Service Analysis
PROBLEM | CAUSE | REMEDY | |
Compressor and Condenser Fan | Power failure. | Call power company. | |
Will Not Start. |
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| Fuse blown or circuit breaker tripped. | Replace fuse or reset circuit breaker. | |
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| Defective thermostat, contactor, transformer, or | Replace component. |
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| control relay. |
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| Insufficient line voltage. | Determine cause and correct. |
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| Incorrect or faulty wiring. | Check wiring diagram and rewire correctly. |
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| Thermostat setting too high. | Lower thermostat setting below room temperature. |
Compressor Will Not Start But | Faulty wiring or loose connections in compressor | Check wiring and repair or replace. | |
Condenser Fan Runs. | circuit. |
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| Compressor motor burned out, seized, or internal | Determine cause. Replace compressor. |
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| overload open. |
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| Defective run/start capacitor, overload, start relay. | Determine cause and replace. |
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| One leg of | Replace fuse or reset circuit breaker. Determine cause. |
Compressor Cycles (Other Than | Refrigerant overcharge or undercharge. | Recover refrigerant, evacuate system, and recharge to | |
Normally Satisfying Thermostat). |
| nameplate. | |
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| Defective compressor. | Replace and determine cause. |
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| Insufficient line voltage. | Determine cause and correct. |
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| Blocked condenser. | Determine cause and correct. |
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| Defective run/start capacitor, overload, or start relay. | Determine cause and replace. |
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| Defective thermostat. | Replace thermostat. |
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| Faulty | Replace. |
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| Restriction in refrigerant system. | Locate restriction and remove. |
Compressor Operates | Dirty air filter. | Replace filter. | |
Continuously. |
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| Unit undersized for load. | Decrease load or increase unit size. | |
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| Thermostat set too low. | Reset thermostat. |
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| Low refrigerant charge. | Locate leak; repair and recharge. |
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| Leaking valves in compressor. | Replace compressor. |
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| Air in system. | Recover refrigerant, evacuate system, and recharge. |
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| Condenser coil dirty or restricted. | Clean coil or remove restriction. |
Excessive Head Pressure. | Dirty air filter. | Replace filter. | |
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| Dirty condenser coil. | Clean coil. |
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| Refrigerant overcharged. | Recover excess refrigerant. |
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| Air in system. | Recover refrigerant, evacuate system, and recharge. |
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| Condenser air restricted or air | Determine cause and correct. |
Head Pressure Too Low. | Low refrigerant charge. | Check for leaks; repair and recharge. | |
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| Compressor valves leaking. | Replace compressor. |
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| Restriction in liquid tube. | Remove restriction. |
Excessive Suction Pressure. | High head load. | Check for source and eliminate. | |
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| Compressor valves leaking. | Replace compressor. |
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| Refrigerant overcharged. | Recover excess refrigerant. |
Suction Pressure Too Low. | Dirty air filter. | Replace filter. | |
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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. |
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| Insufficient evaporator airflow. | Increase air quantity. Check filter and replace if |
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| necessary. |
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| Temperature too low in conditioned area. | Reset thermostat. |
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| Outdoor ambient below 25 F. | Install |
Evaporator Fan Will Not Shut Off. | Time off delay not finished. | Wait for | |
Compressor Makes Excessive | Compressor rotating in wrong direction. | Reverse the | |
Noise (580F072 and 073 Scroll |
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Only). |
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