Yes, your air conditioner will automatically shut off if the condensate drain line is clogged, provided your system is equipped with a properly installed safety float switch. When a drain line becomes blocked, water backs up rapidly into the primary or secondary drain pan. A safety float switch (often called a Sauermann or SS1 switch) floats upward as the water level rises, instantly cutting the low-voltage 24V control circuit to the thermostat and shutting the compressor down to prevent a catastrophic ceiling or attic flood. Verification: Check your indoor air handler drain pan to see if water is touching the safety float switch mechanism.
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