If it is not calling for cooling, or if it is malfunctioning, it will not send the signal to the outdoor unit. Inside, the air handler rumbles and blows air, but the outside unit remains completely still.
Why the Compressor Isn’t Starting When the Air Handler Is Running
When to Call a Professional While checking the thermostat setting and the breaker box are good first steps, complex issues like a faulty contactor, a failing capacitor, or a refrigerant leak require the expertise of a certified HVAC technician. The air handler is the indoor component responsible for pulling warm air across the evaporator coil and pushing the cooled air through your ducts.
If a condensate drain line is clogged and water is overflowing, the high-water safety switch will halt operation. When these two systems fall out of sync, it creates an inefficient and uncomfortable situation that requires prompt diagnosis to resolve.
Troubleshooting Air Handler On But Compressor Not Starting
Safety Switch Malfunction: High-pressure or low-pressure switches prevent the system from running if it detects dangerously low refrigerant levels or a blockage. Homeowners can perform a basic visual inspection without touching any wiring.
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