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. If it is not calling for cooling, or if it is malfunctioning, it will not send the signal to the outdoor unit.
Outdoor Unit Frozen or Not Running When Air Handler Is On
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. Inside, the air handler rumbles and blows air, but the outside unit remains completely still.
Similarly, modern HVAC systems rely on a network of safety sensors. Additionally, if the airflow is restricted due to a dirty evaporator coil or a clogged air filter, the system may overheat and trigger a shutdown, leaving the air handler running but unable to cool the space effectively.
Outdoor Unit Frozen or Not Running When Air Handler Is On
Homeowners can perform a basic visual inspection without touching any wiring. 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.
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