The condensing unit outside your home contains the parts vital to starting the cooling process. Among those parts is a blower fan that points at the condenser coils to prevent overheating and promote the proper phase change that allows the refrigerant fuel to move from outside to inside your home's air handler.
Problems with the fan's blades or motor can occur and cause issues with the cooling system. But problems in other parts of the condensing unit can also impact how the fan does its job.
Malfunctioning Condenser Coils Overpower Fan Capacity
The condenser coils change gas refrigerant into a liquid and become warm in the process. The blower fan circulating ambient air over the surface of the coils controls the warmth. But the coils can experience a problem that causes the surface to become too hot for the fan to offset, so the system will then experience a system shutdown due to a safety sensor that monitors for overheating.
What factors can cause the condenser coils to become overly hot? The coils can heat up due to a problem in the phase change calibration, which can include either dirt on the surface of the coils or a refrigerant issue. The refrigerant issues can include too little refrigerant in the system or the wrong type of refrigerant in the system.
Malfunctioning Compressor Capacitors Shut Fan Down Before it Functions
The fan turns on once the compressor pushes gas refrigerant into the condenser coils. If the compressor doesn't start up properly, the fan doesn't start up properly and your whole system fails to cool your home.
A compressor shutting down quickly but unexpectedly is often due to a broken start capacitor. The start capacitor is a small cylindrical electricity storage device that can give the compressor a power boost if the compressor should falter while starting. If the capacitor fails, the compressor will simply shut off and the unit will stop running.
You can test the start capacitor with a multi-meter set to Ohms of resistance. You first need to turn off the power to the unit and drain the charge from the capacitor by setting the meter to AC and draining the terminals to zero. Check the Ohms reading and make sure it matches what's printed on the capacitor. If it doesn't match, call an air conditioning repair tech, such as those found at Phil's Heating and Air Conditioning, Inc., for a new part.