| Questions | Cause | Remedy |
| Have you checked the line voltage? | Low line voltage. | Increase voltage to no less than 10% under compressor motor rating. |
| | Excessive line voltage. | Reduce voltage to maximum of 10% over motor rating. |
| Have you checked the wiring? | Improperly wired. | Check wiring against diagram and correct as necessary. |
| Do you have correct contactor or Relay? | Incorrect contactor or Relay. | Replace contactor or Relay with model that has properly selected characteristics. |
| How is the contactor or relay mounted? | Incorrect mounting. | Mount in correct position. |
| Is the contactor or relay vibrating? | Contactor or relay vibrating. | Tighten mounting screws, mount contactor or relay in Rigid location. |
| Is the compressor short cycling? | Short cycling. | Reduce number of starts per hour. |
