Carrier KGAPN3901ALL Conversion Kit 30067439-890 or the furnace control board

or the furnace control board flashing a "pressure switch stuck open" or "stuck closed" fault code

This relay is rated for 10 Amps resistive at 120VAC and 7 Amps at 277VAC

it handles a dual-scale pressure range of 0-75 PSI (also measured in feet of H2O) and a temperature spectrum of 70-320°F (20-160°C)

and the diaphragm needed to maintain a tight seal and accurate modulating control

25-inch diameter and 1-inch width are calibrated to match original blower curves

Carrier KGAPN3901ALL Conversion Kit 30067439-890 or the furnace control boardThe Carrier KGAPN3901ALL is a critical LP to natural gas conversion kit designed for high efficiency Carrier, Bryant, and Payne furnaces. This genuine OEM conversion kit allows for a seamless transition from liquid propane to natural gas, ensuring your equipment maintains proper manifold pressure and thermal output. This comprehensive kit is compatible with fixed speed, two stage, and variable speed condensing furnaces, including popular models like