and impeller—to ensure a full system restoration

it is factory-charged with 25 ounces of POE oil for immediate installation

Always verify the temperature range and differential match your specific equipment needs before installation

Technical Performance Specs

this factory-spec heat relay is a critical link between your low-voltage thermostat and high-voltage heating elements

Lochinvar & A.O. Smith 100208631 Wire 328140-751 and impeller—to ensure a fullWhen you're out on a call for Lochinvar Knight or A. O. Smith high efficiency boilers, a faulty Lochinvar 100208631 can shut down the whole system. This replacement wiring harness is engineered specifically for flame sensor electrode circuits in FB and OF series units. As a veteran tech, you know that brittle or corroded HVAC wiring leads to intermittent flame signal loss (microamps), causing those frustrating nuisance lockouts. This OEM harness