What is a key indicator that a capacitor may be failing in an HVAC system?

A key indicator that a capacitor may be failing in an HVAC system is the occurrence of unusual humming noises or the motor not starting. Capacitors play a crucial role in starting and running the motors in HVAC systems by providing the necessary electrical charge to initiate motor action and maintain its operation.

When a capacitor begins to fail, it can result in insufficient electrical supply to the motor. This may cause the motor to hum loudly as it struggles to start up without enough power. In some cases, the motor may not start at all, leading to operational failures in the HVAC system.

The other indicators listed, while they can signify other problems within the HVAC system, do not specifically correlate with capacitor failure. Engine overheating pertains more to issues with the engine or motor itself rather than the capacitor’s functionality. Low refrigerant levels are tied to the cooling process and do not directly involve capacitors. Excessive ice buildup usually indicates airflow or refrigerant circulation problems, which again, are not directly linked to the state of the capacitor.