COMPLAINT | CAUSE | REMEDY |
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Fan motor will not run. | No power | Check voltage at outlet. Correct if none. |
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| Power supply cord | Check voltage to rotary switch. If none, check |
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| power supply cord. Replace cord if circuit is open. |
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| Rotary switch | Check switch continuity. Refer to wiring diagram |
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| for terminal identification. Replace switch if |
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| defective. |
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| Wire disconnected or | Connect wire. Refer to wiring diagram for terminal |
| connection loose | identification. Repair or replace loose terminal. |
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| Capacitor (Discharge | Test capacitor. |
| capacitor before testing.) | Replace if not within ±10% of manufacturer's |
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| rating. Replace if shorted, open, or damaged. |
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| Will not rotate | Fan blade hitting shroud or blower wheel hitting |
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| scroll. Realign assembly. |
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| Units using slinger ring condenser fans must |
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| have 1/4 to 5/16 inch clearance to the base. If it is |
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| hitting the base, shim up the bottom of the fan |
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| motor with mounting screw(s). |
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| Check fan motor bearings; if motor shaft will not |
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| rotate, replace the motor. |
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Fan motor runs | Revolves on overload. | Check voltage. See limits on this page. If not within |
intermittently |
| limits, call an electrician. |
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| Test capacitor. |
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| Check bearings. Does the fan blade rotate freely? |
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| If not, replace fan motor. |
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| Pay attention to any change from high speed to |
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| low speed. If the speed does not change, replace |
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| the motor. |
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Fan motor noise. | Grommets | Check grommets; if worn or missing, replace them. |
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| Fan | If cracked, out of balance, or partially missing, |
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| replace it. |
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| Turbo fan | 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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