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| Table 17 | - Troubleshooting |
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| SYMPTOMS |
| CAUSE |
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| REMEDY |
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| COMPRESSOR DOES |
| Power | line open |
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| Reset circuit breaker |
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| NOT RUN |
| Control fuse open |
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| Check control circuit for ground or short. |
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| Replace | fuse |
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| High Pressure Switch (HPS) |
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| Move |
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| tripped |
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| position then back to RUN or CCN position. |
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| Tripped power breaker |
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| Check the controls. Find cause of trip |
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| and reset breaker |
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| Loose | terminal | connection |
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| Check connections |
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| Improperly wired controls |
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| Check wiring and rewire. |
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| Low line | voltage |
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| Check line voltage. Determine location |
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| of voltage drop and remedy deficiency |
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| Compressor motor defective |
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| Check motor winding for open or |
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| Replace compressor if necessary. |
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| Seized compressor |
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| Replace compressor. |
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| COMPRESSOR CYCLES OFF |
| Loss of charge |
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| Repair leak and recharge |
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| ON LOW PRESSURE |
| Bad transducer |
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| Replace transducer. |
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| Low refrigerant charge |
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| Add | refrigerant. |
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| COMPRESSOR SHUTS DOWN |
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| Replace | control |
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| Compressor discharge valve partially closed |
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| Open valve | or replace if defective. |
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| Condenser fan(s) not operating |
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| Check wiring. Repair or replace motor(s) |
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| if defective. |
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| Condenser coil oluaaed | or dirtv |
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| Clean | coil. |
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| UNIT OPERATES LONG OR |
| Low refrigerant charge |
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| Add | refrigerant, |
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| CONTINUOUSLY |
| Control contacts fused |
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| Replace | control |
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| Partially |
| plugged | or plugged expansion |
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| Clean | or replace |
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| valve or filter driver |
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| Defective | insulation |
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| Replace | or | repair. |
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| Service |
| load |
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| Keep doors and windows closed. |
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| Check valves. Replace if necessary. |
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| SYSTEM NOISES |
| Piping | vibration |
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| Support | piping as required |
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| Expansion valve hissing |
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| Add | refrigerant. |
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| Check for plugged liquid line filter drier. |
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| Compressor noisy |
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| Check valve plates for valve noise. |
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| Replace compressor (worn bearings). |
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| Check for loose compressor holddown bolts. |
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| COMPRESSOR LOSES OIL |
| Leak in system |
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| Repair | leak. |
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| Mechanical damage (blown piston or |
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| Repair damage or replace compressor. |
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| broken discharge valve) |
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| Crankcase heaters not energized |
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| Replace heaters, check wiring and |
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| durina | shutdown |
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| crankcase heater relay contacts. |
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| FROSTED SUCTION LINE |
| Expansion valve admitting excess |
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| Check cooler and compressor thermistors. |
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| refrigerant |
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| Test | EXV. |
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| HOT LIQUID LINE |
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| Shortaae of refriaerant due to leak |
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| Repair leak and recharge |
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| FROSTED LIQUID LINE |
| Shutoff valve partially closed or restricted |
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| Open valve or remove restriction. |
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| COMPRESSOR DOES NOT |
| Burned | out coil |
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| Replace | coil |
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| UNLOAD |
| Defective | capacity control valve |
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| Replace | valve |
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| Miswired | solenoid |
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| Rewire correctly. |
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| Weak, broken, or wrong valve body spring |
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| Replace | spring |
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| fgF;RESSOR DOES NOT |
| Miswired | solenoid |
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| Rewire correctly |
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| Defective | capacity control valve |
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| Replace | valve. |
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| Plugged strainer (high side) |
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| Clean or replace strainer. |
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| Stuck or damaged unloader piston or |
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| Clean or replace the necessary parts. |
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| piston ring(s) |
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