How do I verify if this limit switch is defective

As a fundamental furnace limit switch for York

The internal bore is precisely machined to 0

Common Questions Is the Reznor 113149 compatible with standard round ductwork

MARS 61431 Contactor How do I verify ifThe MARS 61431 Contactor is a professional grade 3 pole definite purpose contactor engineered for high demand HVACR applications. Operating with a 120V coil and rated for 30 FLA (Full Load Amps), this component is a reliable solution for switching inductive loads in commercial refrigeration, air conditioning, and electric heating systems. The enclosed body design significantly reduces noise and prevents dust or debris from contaminating the internal