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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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| Rotary | Check for continuity, refer to the wiring diagram |
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| for terminal identification. Replace the switch if |
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| the circuit is open. |
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| Capacitor (discharge | Check the capacitor. |
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| capacitor before | Replace if not within ±10% of manufacturer’s |
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| servicing.) | rating, replace if shorted, open, or damaged. |
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| Compressor | Check the compressor for open circuit or |
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| ground. If open or grounded, replace the |
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| compressor. |
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| Overload | Check the compressor overload if externally mounted. |
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| Replace if open. (If the compressor temperature is |
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| high, remove the overload, cool, and retest.) |
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Service Manual 24
