Common causes include a faulty ignitor

As the authorized direct replacement for P474-0400

or the compressor tripping on high-pressure or internal overloads due to restricted flow

Durable Construction: Built to withstand the high-ambient cabinets of gas-fired heating systems

maintaining the critical gap distance for reliable spark or standing pilot ignition

Johnson Controls P72CA-2 Pressure Control Els PW 17895 Common causes include a faultyJohnson Controls P72CA 2 Two Pole High Pressure Control, DPST, Open High Close Low, 50 Psi to 450 Psi, 60 Psi to 150 Psi Differential, 36" Capillary with 1 4" Flare Nut, 525 Psi Max Bellows Overpressure, Includes Universal Mounting Bracket, "All Range" for R 12, R 22, R 134A, R 500 and R 502 P72CA 2 is identical to P72CA 2C