SYMPTOMS OF A FAILING CAPACITOR.

Alejandro Arredondo
Nov 28, 2023
2 min read

The capacitor in an HVAC (heating, ventilation, and air conditioning) system plays a crucial role in starting the motors of the compressor and fan. When a capacitor is failing or has failed, you may notice several symptoms indicating that it needs to be replaced. Here are some common signs:

Trouble Starting or Weak Starting:

If the HVAC system struggles to start, takes a long time to start, or needs a manual push to get going, it could be a sign of a capacitor issue.

No Cold Air or Weak Airflow:

Reduced cooling performance or weak airflow from the vents may indicate a problem with the capacitor affecting the operation of the blower fan.

Loud or Unusual Noises:

Unusual noises, such as clicking or humming sounds, may occur when the capacitor is malfunctioning. This can be a result of the capacitor not providing the necessary electrical boost for the motors.

Frequent System Cycling:

If your HVAC system is turning on and off frequently (short cycling), it could be a sign of a capacitor problem. The capacitor helps regulate the cycling of the system, and when it's failing, the system may not operate as it should.

System Not Responding to Thermostat Settings:

If the HVAC system does not respond or does not cool/hear as per the thermostat settings, the capacitor could be a potential culprit.

Visible Signs of Damage:

Physically inspect the capacitor for signs of damage, such as bulging or leaking. A damaged capacitor may not function properly and should be replaced.

Burning Smell:

A burnt or overheated smell near the HVAC unit can be an indication of a failing capacitor. If you notice any burning odors, it's essential to address the issue promptly.

It's important to note that while these symptoms are indicative of a potential capacitor issue, other HVAC system components could also be contributing to the problems. If you suspect an issue with your HVAC system, it's advisable to consult with a qualified HVAC technician to diagnose and address the problem accurately. They can perform a thorough inspection and replace the capacitor if necessary.