Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 This high-limit safety control is

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

we recommend maintaining the original pipe diameter to ensure the BTU rating of the heater is not compromised by gas starvation

While these switches can fail due to age or vibration

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

Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 This high-limit safety control isThe 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