Checking the Electrical Components Electrical faults are the most frequent culprits when the indoor unit runs but the condenser does not. 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.
Why Your Outside Unit Stays Silent When the Air Handler Runs
Standing in a stuffy room, you glance over at the outdoor unit and notice an unsettling silence. If a condensate drain line is clogged and water is overflowing, the high-water safety switch will halt operation.
Inside, the air handler rumbles and blows air, but the outside unit remains completely still. 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.
Why Your Outside Unit Stays Silent When the Air Handler Runs
Thermostat Issues: The thermostat is the brain of the operation. Safety Switch Malfunction: High-pressure or low-pressure switches prevent the system from running if it detects dangerously low refrigerant levels or a blockage.
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