Table 9 – Troubleshooting Chart
SYMPTOM | CAUSE | REMEDY | |
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| Power failure | Call power company | |
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| Fuse blown or circuit breaker tripped | Replace fuse or reset circuit breaker | |
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| Defective contactor, transformer, control relay, or | Replace component | |
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Compressor and outdoor fan |
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will not start |
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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 low/too high | Reset Thermostat setting | |
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| |
| Faulty wiring or circuit | Check wiring and repair or replace | |
| Loose connections in compressor | ||
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| Compressor motor burned out, seized, or | Determine cause | |
Compressor will not start but condenser fan | internal overload open | Replace compressor | |
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| ||
Defective run capacitor, overload, or PTC (positive |
| ||
runs | Determine cause and replace | ||
temperature coefficient) thermistor | |||
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| One leg of | Replace fuse or reset circuit breaker | |
| Determine cause | ||
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| Low input voltage | Determine cause and correct | |
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| |
Scroll compressor is rotating in the wrong direction | Correct the direction of rotation by reversing the | ||
060 unit) has a low pressure differential | |||
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| Refrigerant overcharge or undercharge | Recover refrigerant, evacuate system, and re- | |
| charge to capacities shown on rating plate | ||
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| Defective compressor | Replace and determine cause | |
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| |
Compressor cycles (other than normally sat- | Insufficient line voltage | Determine cause and correct | |
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| ||
isfying) cooling/heating calls | Blocked outdoor coil | Determine cause and correct | |
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| |
| Defective run/start capacitor, overload or start relay | Determine cause and replace | |
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| Faulty outdoor fan motor or capacitor | Replace | |
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| Restriction in refrigerant system | Locate restriction and remove | |
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| Dirty air filter | Replace filter | |
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| Unit undersized for load | Decrease load or increase unit size | |
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| Thermostat temperature set too low | Reset Thermostat setting | |
Compressor operates continuously |
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Low refrigerant charge | Locate leak, repair, and recharge | ||
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| Air in system | Recover refrigerant, evacuate system, and re- | |
| charge | ||
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| |
| Outdoor coil dirty or restricted | Clean coil or remove restriction | |
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| |
| Dirty air filter | Replace filter | |
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| |
| Dirty indoor or outdoor coil | Clean coil | |
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| |
Excessive head pressure | Refrigerant overcharged | Recover excess refrigerant | |
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Air in system | Recover refrigerant, evacuate system, and re- | ||
| |||
| charge | ||
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|
| |
| Indoor or outdoor air restricted or air | Determine cause and correct | |
Head pressure too low | Low refrigerant charge | Check for leaks, repair and recharge | |
Restriction in liquid tube | Remove restriction | ||
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| High Heat load | Check for source and eliminate | |
Excessive suction pressure | Reversing valve hung up or leaking internally | Replace valve | |
| Refrigerant overcharged | Recover excess refrigerant | |
| Dirty air filter | Replace filter | |
| Low refrigerant charge | Check for leaks, repair and recharge | |
| Metering device or low side restricted | Remove source of restriction | |
Suction pressure too low | Insufficient coil airflow | Check | |
| Temperature too low in conditioned area | Reset Thermostat setting | |
| Outdoor ambient below 55°F (13°C) | Install | |
| Filter drier restricted | Replace |
664B
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