As a veteran-grade electronic boiler safety control

Engineered as a normally closed (NC)

a sticking or misaligned air shutter can lead to irregular flame patterns or nuisance pressure switch trips

High BTU Rating: Rated for up to 900

75-inch lead

Carrier HH12AT008 Fan/Limit Switch 321142-301 As a veteran-grade electronic boilerThe Carrier HH12AT008 Fan Limit Switch is a critical safety and operational component designed for intermittent ignition and legacy standing pilot gas furnaces. Engineered to regulate blower motor engagement and provide high limit protection, this bimetal sensing element control ensures the heat exchanger does not exceed safe operating temperatures. As a combination fan limit control, it features adjustable cut in and cut out settings, allowing