50CR
Table 7—Troubleshooting Chart
SYMPTOM | CAUSE | REMEDY | |
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| Power failure | Call power company | |
| Fuse blown or circuit breaker tripped | Replace fuse or reset circuit breaker | |
| Defective contactor, transformer, control relay, defrost | Replace component | |
| board, or | ||
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Compressor and outdoor fan | Insufficient line voltage | Determine cause and correct | |
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will not start | Incorrect or faulty wiring | Check wiring diagram and rewire correctly | |
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| User Interface setting too low/too high | Reset UI setting | |
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| DO NOT bypass this compressor time | |
| Units have a | ||
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| relay is | |
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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 |
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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 (20 percent low) | Determine cause and correct | |
| 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 | |
Compressor cycles (other than normally satis- | Insufficient line voltage | Determine cause and correct | |
Blocked outdoor coil | Determine cause and correct | ||
fying) cooling/heating calls | |||
Defective run/start capacitor, overload or start relay | Determine cause and replace | ||
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| Faulty outdoor fan motor or capacitor | Replace | |
| Damaged reversing valve | Determine cause and correct | |
| Restriction in refrigerant system | Locate restriction and remove | |
| Dirty air filter | Replace filter | |
| Unit undersized for load | Decrease load or increase unit size | |
| UI temperature set too low/too high | Reset UI setting | |
| Low refrigerant charge | Locate leak, repair, and recharge | |
Compressor operates continuously |
| Check defrost time settings | |
Frosted coil with incorrect defrost operation | Reset as necessary | ||
| Check defrost temperature switch | ||
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| Replace as necessary | |
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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 | |
| Dirty air filter | Replace filter | |
| Dirty indoor or outdoor coil | Clean coil | |
| Refrigerant overcharged | Recover excess refrigerant | |
Excessive head pressure |
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Air in system | Recover refrigerant, evacuate system, and re- | ||
| charge | ||
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| (Heat) Indoor air restricted or recirculating | Determine cause and correct | |
| Indoor or outdoor air restricted or air | Determine cause and correct |
(Continued next page)
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