How do I verify if the switch has failed vs

Testing for 24V at the ALR terminal during a fault can confirm if the relay is functioning correctly

this component provides the exact physical footprint and port alignment needed to restore safe furnace operation without the field-modifications often required by generic alternatives

utilizing the correct fan speed controller cable is critical for achieving consistent refrigerant pressure regulation

replacing a fouled heater is standard practice to restore system reliability

Lochinvar & A.O. Smith 100189054 Collar 326058-755 How do I verify ifThe Lochinvar & A. O. Smith 100189054 Collar is a precision engineered 4" flue collar essential for maintaining the structural integrity of high efficiency venting systems. As an OEM component, this kit provides a secure, gas tight transition between the appliance and the exhaust infrastructure, preventing hazardous leaks and ensuring optimal draft performance. This specific part is a direct replacement for legacy units, as 100189054 is identical to