Tech Tips

Outdoor Unit Will Not Run

  1. Contactor Will Not Pull "In"


    • No Low Voltage (24 volt) between "Yellow" and "Brown" Wires at Unit
    • No Low Voltage at Contactor Coil
      • Open Pressure Switch
      • Bad Time Delay
      • Compressor Motor Protector Contacts Open
    • Bad Contactor


  2. Contactor Pulls "In"


    • No Line Voltage
      • Blown Fuse
      • Tripped Circuit Breaker
      • Open Service Disconnect
    • "Missing" Phase Leg