TROUBLESHOOTING
PROBLEM | POSSIBLE CAUSE | TO CORRECT | |
| Power disconnected. | Check power source. | |
| System switch in “Off” | Set switch correctly. | |
| position. | ||
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| Branch circuit fuse blown or | Replace fuse, reset breaker. If repeats, check fuse | |
| or breaker size. Check for shorts in unit wiring and | ||
UNIT DOES NOT RUN. | circuit breaker tripped. | ||
components. | |||
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| Inoperative system switch. | Test for continuity. | |
| Loose or disconnected wiring | Check wiring and connections. | |
| at switch. | Connect per wiring diagram. | |
| Inoperative switch | Test for continuity, 3 and 2, 5 and 6. | |
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| Dirty Filter. | Clean as recommended in Owner’s Manual. | |
| Restricted air flow. | Check for dirty or obstructed coil - clean as required. | |
| Inoperative thermostat. | Test for shorted thermostat or stuck contacts. | |
EVAPORATOR COIL | Short of refrigerant. | ||
FREEZES UP. |
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| Partially restricted capillary. | Touch test coil return bends for same temperature. Test for | |
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| low running current. | |
| Inoperative fan motor. | Test and replace if inoperative. | |
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| Excessive heat load. | Test cooling performance of unit. Unit undersized. | |
COMPRESSOR RUNS | Restriction in line. | Check for partially iced coil. Check temperature split | |
across coil. | |||
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CONTINUALLY. |
| Check for presence of oil on silver soldered connections. | |
DOES NOT CYCLE | Refrigerant leak. | Check for partially iced coil. Check split across coil. | |
OFF. |
| Check for low running amperage. | |
| Thermostat contacts stuck. | Check operation of thermostat. Replace if contacts | |
| remain closed. | ||
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| Loss of charge in thermostat | Place jumper across thermostat terminals. If unit | |
| bulb. | operates, replace thermostat. | |
THERMOSTAT DOES | Loose or broken parts in | Check as above. | |
NOT TURN UNIT ON. | thermostat. | ||
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| Incorrect wiring. | Connect per wiring diagram. | |
| System switch open. | Test for continuity at switch terminals 2 and 3. | |
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| Thermostat set at coldest | Turn to highest temperature setting to see of unit will cycle | |
| point | off. | |
THERMOSTAT DOES | Thermostat contacts stuck. | Disconnect power to the unit. Remove cover of thermostat | |
NOT TURN UNIT OFF. | and check if contact is stuck, if so replace thermostat. | ||
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| Switch (On - Off) shorted. | Test switch for open contacts at terminals 2 and 3 with | |
| switch in “Off” position. | ||
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