Compressor and Outdoor Fan Will Not Start - Internal component failure.

What does Defective thermostat, contactor, transformer, control relay, or capacitor. mean?

A critical control or starting component within the unit has failed, preventing the compressor and fan from operating.

• Age or wear of internal electrical components.
• Electrical surge or stress.

Click steps to track your progress.

1. 1

   Ensure the thermostat is set correctly for operation (e.g., set to cool and below room temperature, or heat and above room temperature).

2. 2

   Visually inspect accessible wiring for loose connections or damage.

3. 3

   If the unit has a contactor, check if it is pulling in when the thermostat calls for operation (requires electrical testing).

4. 4

   Contact a qualified HVAC technician to diagnose and replace the faulty component.