Intro

When an AC will not turn on, it can be caused by a simple setting or a system safety issue.

What This Problem Means

The system is not receiving power or is being told not to start.

Homeowners may say:

• AC won’t start

• Outside unit not running

• AC dead

Common Causes

• Thermostat batteries dead

• Breaker tripped

• Safety delay

• Failed electrical part

Safe Things a Homeowner Can Check

• Replace thermostat batteries

• Make sure thermostat is set to cool

• Check breaker once

If the breaker trips again, stop and call a professional.

When to Call a Professional

Electrical repairs can be dangerous. Continued resets can damage the system.