Product Manual

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AC Motor Trouble-Shooting Chart
1. Disconnect power to the motor before performing service or maintenance. 2. Discharge all capacitors before servicing motor. 3. Always keep hands and clothing away from moving parts. 4. Be sure required safety guards are in place before starting equipment.
Problem Likely Causes What To Do Motor fails to start upon Motor is miswired. Verify that the motor is wired correctly. initial installation. Motor damaged and rotor is striking stator. May be able to reassemble; otherwise, motor should be replaced. Fan guard bent and contacting fan. Replace fan guard. Motor had been running, then fails Fuse or circuit breaker tripped. Replace fuse or reset breaker. to start. Stator is shorted or went to ground. Motor will make Disassemble motor and inspect windings and internal connections. a humming noise and the circuit breaker or fuse A blown stator will show a burn mark. Motor must be replaced or will trip. the stator rewound. Motor overloaded or load jammed. Inspect to see that the load is free. Verify amp draw of motor versus nameplate rating. Capacitor (on shingle phase motor) may have failed. First discharge capacitor. To check capacitor, set volt-ohm meter to RX100 scale and touch its probes to capacitor terminals. If capacitor is OK, needle will jump to zero ohms, and drift back to high. Steady zero ohms indicates a short circuit; steady high ohms indicates an open circuit.