Johnson Controls P100AP-4 Pressure Control it provides an essential layer

it provides an essential layer of protection for the heat exchanger and venting system

the leads are non-polar

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

then apply an additional 1/4 turn with a wrench

Manual Reset Mechanism: Ensures the system cannot auto-restart until a contractor identifies and resolves the specific cause of the rollout

Johnson Controls P100AP-4 Pressure Control it provides an essential layerThe 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