Notice a loud buzzing sound coming from your outdoor AC unit while the fan blades stay completely still? Your system is trying to run but is stuck. To prevent a massive repair bill, turn the system off right away. Here is a quick look at the common culprits behind a dead fan and what you should do next.
What You Can Check
Debris Jamming the Blades
Your outdoor unit faces the elements. Twigs, thick leaves, dirt, and other debris can get sucked into the unit and physically block the fan blades from moving.
What you can do: Make sure to turn the power completely off. Look through the metal fan cage. If you see an obstruction, carefully remove it. However, you should never force the blades to spin if they are wedged tightly, as this could damage the motor.
A Seized Fan Motor
If there are no blockages, the motor itself might have burned out from years of hard work in extreme weather.
The “Push Test” Check: With the power completely off, gently push a fan blade with a long wooden stick. If the blades are stiff and hard to turn, the internal bearings have likely seized. In this case, you will need a new motor.
When to Call a Professional
If the former two tests show that there are no debris and the blades are working fine, a professional will need to conduct tests for:
A Dead or Weak Capacitor
The capacitor acts like a starter battery. It stores electrical energy to give the fan motor the powerful jolt it needs to start spinning. Over time, heat and power surges wear it out. If it dies, the motor gets electricity but cannot turn, creating a loud hum.
What you can do: This component must be handled by a professional. It stores high amounts of electricity even when the power is shut off. Contact HAMCO for a professional inspection.
A Failing Contactor
The contactor is the switch that tells your AC to turn on when the thermostat asks for cooling. If its internal parts wear out, it may cause a humming or buzzing noise but fail to send power to the fan.
Diagnosing this requires working with live, high-voltage electricity. This is strictly a job for a professional.
Trust the Professionals at HAMCO
While the “push test” and checking for debris with the power off is safe, fixing high-voltage electrical components is highly dangerous.
If you are in the Hamilton, Burlington, or Oakville areas and need professional A/C inspection and repair, the team at HAMCO Heating & Cooling are ready to help.
Contact us today to get your cooling back up and running safely.
HAMCO has been proudly providing expert HVAC service, repair, and installation in the Hamilton, Burlington, Oakville, Grimsby and Brantford areas since 1946! We are dedicated to always providing our clients with dependable products and reliable service.
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