HVAC Level 2 Alternating Current Module (03206) Practice Test 2026 - Free HVAC Practice Questions and Study Guide

A failing capacitor in an HVAC system often leads to unusual noises and poor startup behavior. Capacitors play a crucial role in providing the necessary power boost to motors during startup, including those in compressors and fan assemblies. When a capacitor starts to fail, it may not provide adequate power, resulting in the motors struggling to start, which can create grinding or humming noises. Additionally, if the motor fails to start correctly, it can lead to operational issues, causing the system to behave erratically and potentially affect its overall performance.

The other options describe conditions that may not directly arise from capacitor failure. High energy consumption and increased humidity can be linked to other system inefficiencies, while consistent low voltage and overheating might be due to wiring issues or problems with the components themselves, rather than the capacitor. Continuous operation without interruption does not typically represent a symptom of capacitor failure and may indicate a different kind of malfunction within the system.