Have HVAC Questions? Ask an HVAC Expert for Answers
I am pulling the data on that unit and will be back shortly
The HPC is an automatic reset on this unit. Meaning it should reset itself once pressure goes down. In your case you have a switch that did not reset.
It can be caused by fan in top not running...dirty outdoor coil, bad defrost board. The end result is something made the pressure too high, the switch tripped...and did not reset. This will require a service call