Johnson Controls P100AP-4 Pressure Control or if the ohm reading

or if the ohm reading indicates an open circuit

then apply an additional 1/4 turn with a wrench

the heating element has likely failed or the thermal cutoff has tripped

A veteran tech will tell you to replace the gasket every time the pilot tube or pilot generator is serviced to prevent nuisance service calls related to air leaks or pilot drop-outs

Johnson Controls P100AP-4 Pressure Control or if the ohm readingThe Johnson Controls P100AP 4 is a heavy duty encapsulated pressure control engineered for precision in condenser fan cycling and low pressure cutout applications. This direct mount pressure switch features a single pole single throw (SPST) configuration designed to open on pressure drop, ensuring reliable system cycling. Pre calibrated for professional HVACR environments, the unit is set to open at 170 PSIG and close at 250 PSIG with an automatic