• Clean and adjust thermostat
  • Check voltage and amperage of all motors
  • Check airflow across the indoor coil
  • Lubricate all moving parts
  • Check air filters
  • Check airflow across the outdoor coil
  • Check indoor fan relay
  • Check compressor contactor
  • Check electrical wiring and connections
  • Check that condensate drain is open
  • Check indoor coil
  • Check operating pressure
  • Check temperature drop across indoor coil
  • Check indoor coil super-heat
  • Check outdoor sub-cooling
  • Check outdoor coil
  • Check reversing valve
  • Check defrost control