The 8220G404 requires a minimum differential pressure of 5 PSI to function correctly as it is a pilot-operated assembly

A faulty 100309396 board often presents as intermittent power loss or failure to respond to input

For technicians running high-demand boiler rooms

which is optimized for heat resistance and outdoor conditions

York S1-2880-3181 Limit Switch 321894-708 The 8220G404 requires a minimumThe York S1 2880 3181 is a precision calibrated high limit switch engineered for critical thermal monitoring in residential and light commercial furnace systems. This 160F 30F limit sensor acts as a primary safety control, interrupting the gas valve or ignition circuit if plenum temperatures exceed the 160 degree Fahrenheit threshold. Featuring a 30 degree differential, this component allows for an automatic reset once the heat exchanger cools to 130