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HomeRepair HelpGibson Central A/C RepairGibson Central A/C Condensing unit does not run Repair
Gibson Central Air Conditioner Condensing unit does not run
If your Gibson central air conditioner's condensing unit does not run, a bad run capacitor or a tripped circuit breaker or blown fuse is the most likely cause. A failed compressor is a possible but less common cause. A faulty wall thermostat can also prevent both the furnace and outdoor unit from starting, followed by a defective condenser fan motor. Check whether the condenser fan blade turns freely by hand with power disconnected, since seized bearings can indicate a failed motor. If the outdoor unit has power but neither the compressor nor fan runs, the system may have low refrigerant, causing the low pressure switch to trip. A failed pressure switch is less common, but it can also stop the condensing unit. Testing the compressor, motors, thermostat, and wiring requires care because the condensing unit contains dangerous 240V line voltage. Turn off power at the disconnect box and circuit breaker before inspection, and do not test live circuits unless you are qualified. Refrigerant diagnosis, sealed-system repairs, compressor replacement, and pressure-switch replacement require EPA 608 certification and a licensed HVAC technician. Enter your Gibson central air conditioner model number to find the exact replacement compressor, thermostat, condenser fan motor, fan motor, or pressure switch for your unit.
01 - Gibson Central Air Conditioner Compressor
Central air conditioners use a compressor to pump refrigerant through the condenser coils located in the outside condensing unit and through the evaporator coils mounted on top of the furnace or air handler. While it's not a common problem, if the compressor fails, the condensing unit will not run. You can use a multimeter to test the compressor for electrical continuity, a continuous electrical path present in the component, to help determine if the compressor is faulty. If all other potentially defective components, such as the capacitor and condenser fan motor, are operating properly, then a qualified technician should ...
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Highly Likely
02 - Gibson Central Air Conditioner Wifi Thermostat
The WiFi thermostat has contacts in it that control the furnace. If the contact fails it can result in the furnace and the condensing unit to not run at all.
Common
03 - Gibson Central Air Conditioner Condenser Fan Motor
A faulty condenser fan motor can be responsible for the central air conditioner condensing unit not running. You can use a multimeter to test the fan motor for electrical continuity, a continuous electrical path present in the motor, to help determine if the motor is defective. You can also use the multimeter to determine if power is reaching the motor. You can also try rotating the fan blades by hand. If the blades do not turn freely, it's likely the motor bearings have seized and the fan motor will need to be replaced.
Common
04 - Gibson Central Air Conditioner Fan Motor
A faulty fan motor can be responsible for the central air conditioner condensing unit not running. You can use a multimeter to test the fan motor for electrical continuity, a continuous electrical path present in the motor, to help determine if the motor is defective. You can also use the multimeter to determine if power is reaching the motor. You can also try rotating the fan blades by hand. If the blades do not turn freely, it's likely the motor bearings have seized and the fan motor will need to be replaced.
Common
05 - Sealed system problem
If the condensing unit has power to it, the contactor checks out okay, but the fan and compressor are not running, it is likely that the unit is low on refrigerant which will cause the low limit pressure switch to trip and keep the unit from running. Since diagnosing and repairing a sealed system takes specialized tools and knowledge, a qualified service technician should diagnosis and repair the unit.
Common
06 - Gibson Central Air Conditioner Pressure Switch
A pressure switch is a safety device used to help prevent component and system failures. There are basically three types of pressure switches used in central air conditioning and heat pump applications: High Limit, Low Limit, and Ambient Temperature. Depending on the model, you may have one or more of these or none. The pressure switch(es) can be checked with a multimeter, referencing the wiring diagram for the circuit locations. Note: If a pressure switch needs to be replaced the refrigerant will need to be removed, requiring a qualified technician.
Less Common
Frequently Asked Questions
Why is my Gibson central air conditioner condensing unit not turning on?
Could a Gibson wall thermostat keep the outdoor AC unit from running?
How do I troubleshoot a condenser fan that is not running?
Could low refrigerant or a pressure switch stop my AC condensing unit from running?
How can I identify and buy the correct Gibson AC replacement part?
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