If the switch opens at 306

though you should always verify specific local code requirements for your installation

This genuine OEM furnace limit switch is engineered with a 250°F fixed open temperature to prevent overheating within the heat exchanger and blower assembly

use a multimeter to check for continuity

How do I check for a clogged orifice

Sensus 143-16-023-00 Orifice If the switch opens atThe Sensus 143 16 023 00 is a high precision 1 2" orifice specifically engineered for the Sensus 243 service regulator series. Built to handle the rigorous demands of commercial and industrial gas regulation, this brass orifice provides accurate flow control with a 10 degree valve angle design. It is fully compatible with both the Sensus 243 8 and 243 12 models, ensuring seamless integration during field maintenance or capacity adjustments. By