Table 34 — Cooling Service Analysis
PROBLEM | CAUSE | REMEDY | |
Compressor and condenser fan | Power failure. | Call power company. | |
will not start. | Fuse blown or circuit breaker tripped. | Replace fuse or reset circuit breaker. | |
| |||
| Defective thermostat, contactor, transformer, or | Replace component. | |
| control relay. |
| |
| 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. | |
Compressor will not start but | Faulty wiring or loose connections in compressor | Check wiring and repair or replace. | |
condenser fan runs. | circuit. |
| |
| Compressor motor burned out, seized, or internal | Determine cause. Replace compressor. | |
| overload open. |
| |
| Defective run/start capacitor, overload, start relay. | Determine cause and replace. | |
| 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. | |
| Defective compressor. | Replace and determine cause. | |
| Insufficient line voltage. | Determine cause and correct. | |
| Blocked condenser. | Determine cause and correct. | |
| Defective run/start capacitor, overload, or start | Determine cause and replace. | |
| relay. |
| |
| Defective thermostat. | Replace thermostat. | |
| Faulty | Replace. | |
| Restriction in refrigerant system. | Locate restriction and remove. | |
Compressor operates | Dirty air filter. | Replace filter. | |
continuously. |
|
| |
Unit undersized for load. | Decrease load or increase unit size. | ||
| |||
| Thermostat set too low. | Reset thermostat. | |
| Low refrigerant charge. | Locate leak; repair and recharge. | |
| Leaking valves in compressor. | Replace compressor. | |
| Air in system. | Recover refrigerant, evacuate system, and recharge. | |
| Condenser coil dirty or restricted. | Clean coil or remove restriction. | |
Excessive head pressure. | Dirty air filter. | Replace filter. | |
| Dirty condenser coil. | Clean coil. | |
| Refrigerant overcharged. | Recover excess refrigerant. | |
| Air in system. | Recover 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 pressure. | High head load. | Check for source and eliminate. | |
| Compressor valves leaking. | Replace compressor. | |
| Refrigerant overcharged. | Recover excess refrigerant. | |
Suction pressure too low. | Dirty air filter. | Replace filter. | |
| Low refrigerant charge. | Check for leaks; repair and recharge. | |
| Metering device or low side restricted. | Remove source of restriction. | |
| Insufficient evaporator airflow. | Increase air quantity. Check filter and replace if | |
|
| necessary. | |
| Temperature too low in conditioned area. | Reset thermostat. | |
| 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 (48TF007 scroll only). |
|
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