Always verify the appliance nameplate and use a digital manometer for final calibration

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

including the Axiom

this open frame transformer provides the stable secondary voltage output required to drive contactors

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

Cleveland Controls DFS-221-156 Switch Always verify the appliance nameplateThe 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