Johnson Controls T-4000-2642 Cover The White Rodgers 3L09-20 Limit

The White Rodgers 3L09-20 Limit Switch is a professional-grade 1/2" bimetal disc limit control designed for high-limit temperature protection in forced air heating systems

replacing a fouled or cracked electrode with this genuine Armstrong 44992-001 ignitor is essential for restoring system safety and preventing nuisance lockouts

Using a multimeter on the DC millivolt setting

It is a direct-fit component for a range of Reznor F-Series models

As an OEM replacement limit switch

Johnson Controls T-4000-2642 Cover The White Rodgers 3L09-20 LimitJohnson Controls T 4000 2642 Gold Plastic Cover, Horizontal, Includes Thermometer and Setpoint Window, Johnson Controls Labeled