For contractors asking how to replace York furnace limit switch components

The heavy-duty internal windings are vacuum-impregnated to withstand thermal cycling and high-voltage stress

Enhanced Durability: Constructed to rigorous OEM technical specifications for long-cycle reliability in high-ambient temperature environments

or erratic high-side and low-side pressures during operation

Protective Overrides: Features terminals for optional outdoor thermostats or humidistats to lock out ventilation during unfavorable weather

Carrier HH18HA497 Limit Switch 319852-301 For contractors asking how toThe Carrier HH18HA497 Limit Switch is a critical safety component designed for precise thermal monitoring in residential and commercial furnaces. As a genuine OEM replacement part, this 190 degree open limit switch is engineered to open the electrical circuit when the heat exchanger cabinet reaches its maximum safety threshold, preventing equipment damage and hazardous conditions. When the temperature drops to the 150 degree close setpoint, the switch