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.
Verify the Thermostat
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.
Reset After a Power Cut
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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