Air Conditioner Won't Turn On: Checklist

A dead AC is most often power, the thermostat, or a tripped safety. Run this checklist before calling out.

By Priya RamanSeptember 25, 20253 min read read

Written by Wade Holbrook, Lead Technician — True Fix Dallas. Factory-trained, EPA-certified, 9 years servicing Dallas–Fort Worth.

Before assuming a compressor failure, rule out the common reasons an AC simply will not start.

Check Power and Breakers

AC units trip breakers and GFCI outlets, especially after a surge.

Fix: Reset the breaker and test the outlet; window units have their own reset button.

A thermostat set wrong or with dead batteries will not call for cooling.

Fix: Set it to cool, below room temperature, and replace the batteries.

Many units have a built-in delay to protect the compressor.

Fix: Wait five minutes after restoring power before expecting it to start.

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