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| Troubleshooting Guide | |
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| COMPLAINT | CAUSE | REMEDY | |
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| Fan motor noise. | Fan | If cracked, out of balance, or partially missing, | |
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| replace it. | |
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| Blower | If cracked, out of balance, or partially missing, | |
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| replace it. | |
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| Loose set screw | Tighten it. | |
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| Worn bearings | If knocking sounds continue when running or | |
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| loose, replace the motor. If the motor hums or | |
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| noise appears to be internal while running, | |
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| replace motor. | |
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| Compressor will not run, | Voltage | Check voltage. See the limits on the preceding | |
| fan motor runs. |
| page. If not within limits, call an electrician. | |
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| Wiring | Check the wire connections; if loose, repair or | |
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| replace the terminal. If the wires are discon- | |
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| nected, refer to wiring diagram for identification, | |
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| and replace the wires. Check the wire connections; | |
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| If not according to the wiring diagram, correct | |
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| the connections. | |
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| Thermistor | Check the TEMP control. If not at the lowest | |
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| number, set TEMP control to this setting and | |
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| restart the unit. | |
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| Check the continuity of the thermistor. Replace | |
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| the thermistor if the circuit is open. | |
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| Check the continuity of the thermostat. Replace | |
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| the thermostat if the circuit is open. | |
Capacitor (discharge | Check the capacitor. |
capacitor before | Replace if not within ±10% of manufacturer’s |
servicing.) | rating, replace if shorted, open, or damaged. |
Compressor | Check the compressor for open circuit or |
| ground. If open or grounded, replace the |
| compressor. |
Overload | Check the compressor overload if externally mounted. |
| Replace if open. (If the compressor temperature is |
| high, remove the overload, cool, and retest.) |
Service Manual 24
