Power Supply Disruption: A tripped breaker, a blown fuse, or a damaged disconnect switch near the outdoor unit can cut power to the compressor and condenser fan. The air handler is the indoor component responsible for pulling warm air across the evaporator coil and pushing the cooled air through your ducts.
Air Handler Running But Outside Unit Not Responding Common Causes
If it is not calling for cooling, or if it is malfunctioning, it will not send the signal to the outdoor unit. Component Purpose Common Failure Contactor Acts as a magnetic switch to power the compressor Stuck open or burned out Capacitor Provides the jolt of electricity to start the fan motor Blown or degraded Relay Transmits signal from thermostat to outdoor unit Stuck closed or open Low Refrigerant and Sensor Errors Refrigerant is the lifeblood of the cooling process, and a significant leak can cause the system to shut down as a safety precaution.
If the refrigerant level drops too low, the low-pressure switch will prevent the compressor from running to avoid catastrophic damage to the system. Safety Switch Malfunction: High-pressure or low-pressure switches prevent the system from running if it detects dangerously low refrigerant levels or a blockage.
Common Fixes for When Air Handler is Running but Outside Unit is Not
Common Causes for the Outdoor Unit Inactivity Before panicking, it is important to understand that the lack of activity outside is often the result of a specific, fixable trigger. Similarly, modern HVAC systems rely on a network of safety sensors.
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