AC won’t turn on but thermostat is on

AC Won’t Turn On, and There’s Water in the Drain Pan

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A technician in a Thermix HVAC uniform uses a multimeter and flashlight to inspect an open indoor air conditioning unit. The unit's drain pan is visibly filled with dirty standing water, indicating a clog or drainage issue.

When your AC won’t turn on, and there’s water pooling in the drain pan, these two problems are almost always connected. In our experience diagnosing and repairing HVAC systems, a full drain pan is one of the most overlooked reasons an air conditioner shuts down completely. Most modern units have a safety float switch that … Read more