AC won't turn on

No outdoor unit operation on a cooling call.

Cooling

high

Diagnosed here

Outdoor Unit Will Not Start
Troubleshooting
A structured electrical walk through when the condensing unit stays silent on a call for cooling.

Possible cause

Control Transformer
Component
The component that creates the 24 volt control circuit, how it is sized, and why its fuse keeps blowing.
Contactor
Component
The low voltage controlled switch that connects line voltage to the outdoor unit.

Affected equipment

Air Conditioner
Equipment
A split system cooling appliance: what each half does and how the two halves have to match.

Local Code Notice

HVAC installation, venting, combustion air, ventilation air, gas piping, clearances, termination locations, electrical requirements, permits, and equipment requirements vary by jurisdiction and equipment. Always verify the applicable local codes, adopted code edition, regulations, permits, and manufacturer installation instructions before installation or service.