Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 always verify the rotation of

always verify the rotation of your existing blower wheel before mounting to ensure correct airflow direction

This high-limit safety control is a direct drop-in replacement for failed or drifting thermal switches in residential and light commercial HVAC equipment

When you're servicing high-efficiency units like the Lochinvar Knight XL or A

While these switches can fail due to age or vibration

Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 always verify the rotation ofThe Lochinvar & A. O. Smith 100166080 Thermal Switch is a critical safety component designed for Residential FVIR (Flammable Vapor Ignition Resistant) gas water heaters. As a resettable thermal switch, it monitors the combustion chamber for excessive temperatures or restricted airflowcommon issues in systems with a clogged flame arrestor or inadequate makeup air. This rollout switch acts as a manual reset high limit, preventing gas flow to the burner