Verify the color coding (Red/Red) and the fixed temperature rating (190°F) against your furnace's service manual

High-Temperature Calibration: The 290°F trip point provides a reliable safety threshold for high-tolerance residential and commercial water heating applications

Will this work if my pilot stays lit but the main burner won't fire

it can function with other spark modules utilizing 1/4" spade terminals

Visual Diagnostics: Built-in status indicator light allows for instant troubleshooting of the 24Vac control circuit

Cleveland Controls DFS-221-156 Switch Verify the color coding (Red/Red)The Cleveland Controls DFS 221 156 is a heavy duty, fixed point air pressure sensing switch engineered for precision airflow verification in HVAC, duct heater, and combustion systems. As a direct FS BO 179 cross reference, this SPDT switch is factory calibrated to actuate on a pressure rise of 0. 05" w. c. (+ 0. 02"), making it a critical safety component for proving draft in boilers and furnaces. Its open mounted design is specifically optimized for