the MP-451 is equipped with a built-in SPDT auxiliary switch and a feedback potentiometer

using this genuine S1-9951-1611 gas orifice maintains the appliance's original efficiency ratings and flame stability

Using this genuine Nordyne part maintains the original equipment’s efficiency ratings and prevents the premature motor burnout often seen with generic universal substitutes

55 inches water column switch is a primary check point to verify inducer motor efficacy and flue integrity

Standardized Fit: Featuring a 1/2" NPT connection and standard shank

Carrier HH18HA435 Limit Switch 323613-751 the MP-451 is equipped withReplace failing thermal components with the Carrier HH18HA435 Limit Switch, a critical safety device engineered for precise temperature monitoring in residential and commercial furnaces. As a veteran grade 100 135F auto limit switch, this component is designed to interrupt the electrical circuit if the plenum temperature exceeds 135F, preventing heat exchanger damage and ensuring system integrity. Once the temperature drops to the 100F reset point,