If the indoor blower motor fails to shut off after the thermostat demand is met

It is compatible with RG2PV service parts and various ultra-low NOx models

or a stuck contactor

remember to adjust your measurements accordingly

Williams 9809 Kit R-407C If the indoor blower motorThe Williams 9809 Kit is a critical direct vent furnace venting solution designed specifically for the Williams 60077 Series. As a dual tube assembly, this kit facilitates the balanced exchange of combustion air and flue gases through a single wall penetration. The 9 inch vent tubes provide the necessary reach for standard exterior wall thicknesses, ensuring that the vent cap maintains proper clearance from the building envelope to prevent exhaust