Max Marquez demonstrates single-pole and double-pole HVAC contactors and discusses how clicking or rattling sounds may indicate a problem. This participant demonstration was recorded during the September–October 2026 HVAC Technical Academy workshop in Sanford, Florida.
HVAC Technical Academy workshop attendee Maurycio Kimbrough explains what an HVAC contactor is, how it transfers voltage in the system, and begins demonstrating how a contactor can be tested.
HVAC Technical Academy student Julian Vivero explains the purpose of an HVAC contactor, how it controls power to major system components, and common causes of contactor failure.
My name is Tommy Cobb, and I’m here at HVAC, and I’m gonna tell you about a contactor.