Top causes of single-phase motor malfunctions

Most problems with single-phase motors involve the centrifugal switch, thermal switch, or capacitor(s). If the problem is in the centrifugal switch, thermal switch, or capacitor, the motor is usually serviced and repaired. However, if the motor is more than 10 years old and less than 1 HP, the motor is usually replaced. If the motor is less than 1/8 HP, it is almost always replaced.

Troubleshooting split-phase (single phase) motors

The split-phase motor has a starting and running winding. The starting winding is automatically removed by a centrifugal switch as the motor accelerates. Some split-phase motors also include a thermal switch that automatically turns the motor OFF when it overheats. Thermal switches may have a manual reset or automatic reset. Caution should be taken with any motor that has an automatic reset, as the motor can automatically restart at any time.

To troubleshoot a split-phase motor, apply the following procedure:

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