A failed or tripped 1320547 limit switch often forces the blower into a continuous "on" state as a safety measure to dissipate excess heat

You can always use a capacitor with a higher voltage rating than the original

and ecocirc 20-18 models

meaning it will re-engage the circuit once the system pressure stabilizes at the 300 PSI close threshold

the White-Rodgers 90-341 is a functional equivalent and a common cross reference for the R4222D1013

Cleveland Controls AFS-271 Switch A failed or tripped 1320547The Cleveland Controls AFS 271 is a professional grade air pressure sensing switch designed for critical proving switch applications in HVAC and energy management systems. This adjustable air flow switch offers a precise set point range of 0. 05" to 2. 0" w. c., making it an essential component for monitoring positive, negative, or differential pressure in commercial burners and furnaces. Engineered with a durable plated housing and a silicone